The present invention is provided with a baseband amplifier 100 having an input side differential line and an output side differential line, the baseband amplifier 100 being electrically connected between the two lines, and a peaking amplifier 200 electrically connected between the input side differential line and the output side differential line. The baseband amplifier includes a variable gain differential amplifier 101 able to vary the gain while maintaining a current from a constant current source of a differential circuit constant. An input differential signal is amplified according to a gain frequency characteristic determined by a first frequency characteristic of the baseband amplifier and a second frequency characteristic of the peaking amplifier on the basis of magnitudes and proportions of the gain of the baseband amplifier and the gain of the peaking amplifier, and a frequency characteristic of an output differential signal obtained by the input differential signal being multiplexed while propagating through the output side differential line can be varied by changing the magnitudes and proportions.
This X-ray inspection device comprises: a transport unit (21) for transporting an object (P) being inspected; an X-ray source (22); an X-ray detection unit (23) having a plurality of sensor elements for receiving X-rays that have passed through the object being inspected; an image data generation unit (41) for generating image data from an X-ray detection output; a quality determination unit (44) that inspects the quality of the object being inspected on the basis of the image data generated and preset determination criteria; and a control unit (4) for controlling the inspection. The control unit (4) is configured to be capable of switching between an inspection mode for the inspection of the object (P) being inspected and a calibration mode for generating calibration data for making the density of the generated image uniform. The control unit (4) includes: a calibration data generation unit (46) for generating, in the calibration mode, calibration data on the basis of the image data generated before and after a calibration member (61) is placed in an inspection area; and a correction unit (432) for correcting, on the basis of the calibration data, the image data of the object (P) being inspected that has passed through the inspection area in the inspection mode.
G01N 23/04 - Recherche ou analyse des matériaux par l'utilisation de rayonnement [ondes ou particules], p.ex. rayons X ou neutrons, non couvertes par les groupes , ou en transmettant la radiation à travers le matériau et formant des images des matériaux
G01N 23/18 - Recherche de la présence de défauts ou de matériaux étrangers
3.
X-RAY INSPECTION DEVICE AND X-RAY INSPECTION METHOD
The present invention provides an X-ray inspection device comprising an X-ray generator (21), an X-ray detector (24), and a determination unit (33) which determines the state of quality of an inspection target (W) on the basis of an X-ray detection signal, said X-ray inspection device comprising: an X-ray image storage unit (31) which stores a first X-ray image (Pe) corresponding to an X-ray detection signal for each transmission area; a pseudo 3D information generation model (41) which generates pseudo 3D information relating to a breed under study; an inspection image generation unit (42) which, on the basis of the first inspection image (Pe) relating to the breed under study, uses the pseudo 3D information to create a pseudo second inspection image (Ps1, Ps2) in which the direction of observation differs from that in the first inspection image (Pe), wherein the determination unit (33) makes a determination on the basis of at least the second inspection image (Ps1, Ps2) created by the inspection image generation unit (42).
An X-ray inspection device 1 as this article inspection device is provided with: an X-ray irradiation unit 11 that irradiates a moving article W to be inspected with an X-ray which is an electromagnetic wave; and an X-ray line sensor 15 that detects an X-ray affected by the article W to be inspected by means of a plurality of detection elements 15a arranged in a main scanning direction (Y direction) orthogonal to the moving direction (X direction) of the article W to be inspected and in the moving direction. The X-ray inspection device 1 is provided with a control circuit 36 that serves as a delay time setting unit and a TDI image generation unit. The control circuit 36 sets a plurality of delay times on the basis of a prescribed reference delay time t, executes a time delay integration process for adding detection data detected by the X-ray line sensor 15 by using the delay times, and generates a plurality of TDI images corresponding to the delay times.
G01N 23/083 - Recherche ou analyse des matériaux par l'utilisation de rayonnement [ondes ou particules], p.ex. rayons X ou neutrons, non couvertes par les groupes , ou en transmettant la radiation à travers le matériau et mesurant l'absorption le rayonnement consistant en rayons X
G01N 23/12 - Recherche ou analyse des matériaux par l'utilisation de rayonnement [ondes ou particules], p.ex. rayons X ou neutrons, non couvertes par les groupes , ou en transmettant la radiation à travers le matériau et mesurant l'absorption le matériau étant un fluide ou un solide granulé en écoulement
5.
METHOD FOR MEASURING RADIATION POWER, MEASUREMENT COUPLER FOR RADIATION POWER, AND APPARATUS FOR MEASURING RADIATION POWER
A method for measuring the radiation power of an object (1) to be measured from the output signal of a reception antenna (15) in such a way that the electromagnetic wave radiation center of the object (1) to be measured is matched to a position in the vicinity of one focus (F1) of a closed space (12) enclosed by an elliptically spherical metal wall surface (11), which is obtained by rotating an ellipse around the axis line passing through the two foci, and the electromagnetic waves radiated from the object (1) to be measured is reflected on the wall surface and is collected at the reception antenna (15) disposed at the position of the other focus (F2). In the method, at least one of the object (1) to be measured or the reception antenna (15) is moved along the axis line passing through the two foci to maximize the output signal power of the reception antenna (15), and the maximized output signal power is stored as a first measured value. A reference antenna (160) placed in place of the object (1) to be measured and the reception antenna (15) are moved in the same way as described above, and a measured value obtained when maximizing the output signal power of the reception antenna (15) and correction data are used to calculate the entire radiation power of the object (1) to be measured.
Frequency fb[i] of a plurality of peak signals appearing in a band of a half or smaller of a certain sampling frequency fs is obtained among spectra obtained from a measured signal sampled at the frequency fs. Each of the plurality of peak signals is assumed to be a beat component (fundamental wave beat component) caused by the fundamental wave of the measured signal before and after the sampling frequency is varied, and each theoretical frequency fc[i,j] of a beat component (harmonic beat component) caused by the harmonic component of the measured signal is successively calculated. The theoretical frequency fc[i,j] is successively compared with the frequency fb[i] of the plurality of peak signals. The peak signal which gives the theoretical frequency fc [k,j] most matching the frequency fb[i] of the plurality of peak signals is determined to be the fundamental wave beat component caused by the fundamental wave of the measured signal. A method of detecting the fundamental wave beat component frequency is thus obtained.
G01R 23/14 - Dispositions pour procéder à la mesure de fréquences, p.ex. taux de répétition d'impulsions; Dispositions pour procéder à la mesure de la période d'un courant ou d'une tension par mesure des battements résultant d'une comparaison de fréquences
G01R 13/34 - Circuits pour représenter une seule forme d'onde par échantillonnage, p.ex. pour de très hautes fréquences
A method of detecting repetitive frequency of a measured signal includes steps of assuming a repetitive signal of the measured signal obtained by a conventional method as tentative repetitive frequency of the measured signal in order to highly accurately detect waveform repetitive frequency of the measured signal even if a fluctuation in frequency is observed in the measured signal, detecting a variation in frequency of a specific signal obtained when the measured signal is sequentially sampled with sampling frequency comprising frequency largely varied from the tentative sampling frequency to cause folding of frequency in sampling, calculating an error included in a sampling number based on the detected variation in frequency of the specific signal and a variation of the sample number indicating how many times the frequency folding has occurred when the measured signal contains the fluctuation in frequency, and correcting the tentative repetitive frequency of the measured signal based on the error included in the sample number, thereby calculating normal repetitive frequency of the measured signal.
G01R 23/02 - Dispositions pour procéder à la mesure de fréquences, p.ex. taux de répétition d'impulsions; Dispositions pour procéder à la mesure de la période d'un courant ou d'une tension
G01R 13/34 - Circuits pour représenter une seule forme d'onde par échantillonnage, p.ex. pour de très hautes fréquences
G01R 23/10 - Dispositions pour procéder à la mesure de fréquences, p.ex. taux de répétition d'impulsions; Dispositions pour procéder à la mesure de la période d'un courant ou d'une tension par conversion de la fréquence en un train d'impulsions qui sont ensuite comptées
A technical problem related to a travelling-wave electrode type optical modulator which is formed with a light guide and a traveling-wave electrode formed on a substrate having the electro-optical effect includes improvement of the characteristics such as optical modulation bandwidth, drive voltage, and characteristic impedance of the travelling-wave electrode type optical modulator. To solve the problem, a structure of a ridge is optimized which is formed in such a manner that a part of the substrate at a region where a high-frequency electric signal propagating in the travelling-wave electrode has high field intensity is reduced in thickness by digging. Further, a buffer layer is formed on the substrate where the ridge is formed and a conductive layer is formed on the buffer layer. At least one part of the buffer layer in the direction of a normal line to a sidewall of the ridge is made smaller in thickness than at least one of the buffer layer portion at a dug area on the substrate and the buffer layer portion on the top of the ridge.
G02F 1/035 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des céramiques ou des cristaux électro-optiques, p.ex. produisant un effet Pockels ou un effet Kerr dans une structure de guide d'ondes optique
A signal measuring device measures a transmission timing of a signal from a mobile terminal which performs communication by the time division/synchronization/code division multiplex method and displays the measurement result in a graph. The device includes: a transmission unit (13) which transmits to a mobile terminal (20) to be measured, a timing control instruction for controlling the transmission timing of the mobile terminal (20); a measuring unit (16) which measures the transmission timing of the signal from the mobile terminal (20) transmitted in accordance with the timing control instruction; and a display control unit (18) which displays on a display unit (19), a graph containing the transmission timings measured by the measuring unit (16) which are time-sequentially arranged and a judgment result obtained by a judgment unit (17).
An M-sequence generating circuit, which is applicable to a random error generating apparatus, has a plurality of registers that are cascade connected and a plurality of exclusive-OR gates that feed bit data stored in the respective registers back to the respective registers each time a clock being inputted to the plurality of registers, and outputs the bit data from the registers in parallel manner. The M-sequence generating circuit includes a Galois field multiplication part, which is so configured as to include the plurality of exclusive-OR gates and arrange that the period of a cyclic group {(α1k), (α2k), (α3k),...,}, which is generated by using, as a generator (αk), an element (αk) obtained by exponentiating, with a specified exponent k where k is equal to or greater than two (k ≥ 2), the root α of one, which has a large number of terms, of a plurality of polynomials of Galois field GF (2m) having an order m where m is equal to the number of the registers (m = a positive integer equal to or greater than two), be within the longest period (2m - 1). The Galois field multiplication part receives, at one of its terminals, the bit data outputted in parallel manner from the registers each time the clock is inputted, while receiving, at the other of its terminals, the generator (αk), and then performs Galois field multiplication between each bit data and the generator (αk). The Galois field multiplication part then outputs the results of Galois field multiplications to the registers in parallel manner as the bit data fed back to the registers.
H04L 1/24 - Tests pour s'assurer du fonctionnement correct
H03K 3/84 - Génération d'impulsions ayant une distribution statistique prédéterminée d'un paramètre, p.ex. générateurs d'impulsions aléatoires
H03M 13/01 - Hypothèses de base sur la théorie du codage; Limites de codage; Méthodes d'évaluation de la probabilité d'erreur; Modèles de canaux; Simulation ou test des codes
11.
JITTER GENERATION DEVICE, DEVICE TEST SYSTEM USING THE SAME, AND JITTER GENERATION METHOD
Provided is a jitter generation device having a configuration for applying a phase modulation to a phase synchronization loop. The jitter generation device includes: a first and a second level control unit for performing level control of a first modulation signal so as to be applied to a jitter addition unit of the phase synchronization loop and a dividing ratio variation means; a parameter setting unit which sets a parameter associated with a desired jitter; an orthogonal modulator; a switching unit; and a control unit. When the switching unit is switched to a first state, the control unit controls the first and the second level control unit so that a local signal obtained by adding the desired jitter to the output signal of the phase synchronization loop can pass through the orthogonal modulator. When the switching unit is switched to a second state, the control unit controls the first and the second level control unit so that orthogonal modulation is applied to a non-modulated local signal obtained without adding the desired jitter to the output signal and inputted to the orthogonal modulator according to the second modulation signal for output.
G01R 31/30 - Tests marginaux, p.ex. en faisant varier la tension d'alimentation
H03L 7/08 - Commande automatique de fréquence ou de phase; Synchronisation utilisant un signal de référence qui est appliqué à une boucle verrouillée en fréquence ou en phase - Détails de la boucle verrouillée en phase
H03L 7/093 - Commande automatique de fréquence ou de phase; Synchronisation utilisant un signal de référence qui est appliqué à une boucle verrouillée en fréquence ou en phase - Détails de la boucle verrouillée en phase concernant principalement l'agencement de détection de phase ou de fréquence y compris le filtrage ou l'amplification de son signal de sortie utilisant des caractéristiques de filtrage ou d'amplification particulières dans la boucle
H03L 7/183 - Synthèse de fréquence indirecte, c. à d. production d'une fréquence désirée parmi un certain nombre de fréquences prédéterminées en utilisant une boucle verrouillée en fréquence ou en phase en utilisant un diviseur de fréquence ou un compteur dans la boucle une différence de temps étant utilisée pour verrouiller la boucle, le compteur entre des nombres fixes ou le diviseur de fréquence divisant par un nombre fixe
12.
RADIATED POWER MEASURING METHOD, COUPLER FOR RADIATE POWER MEASUREMENT, AND RADIATED POWER MEASURING DEVICE
A radiated power measuring method includes: a step of preparing an elliptic mirror having a closed space surrounded by a metal wall of an elliptic cylinder obtained by rotating an ellipse around an axis line passing through its two focal points by a predetermined angle; a step of placing an object-to-be-measured which can radiate a radio wave at one (first) of the focal points in such a manner that the radiation center coincides with the selected focal point; a step of arranging a reception antenna at the position of the other (second) focal point in the closed space of the elliptical mirror; and a step of emitting a radio wave from the object-to-be-measured placed at the first focal point in the closed space of the elliptical mirror so that the radio wave emitted from the object-to-be-measured is reflected by the wall surface and received by the reception antenna arranged at the position of the second focal point, thereby measuring the total radiated power emitted from the object-to-be-measured at the measurement end of the reception antenna in accordance with the output signal from the reception antenna.
G01R 29/08 - Mesure des caractéristiques du champ électromagnétique
H01Q 17/00 - Dispositifs pour absorber les ondes rayonnées par une antenne; Combinaisons de tels dispositifs avec des éléments ou systèmes d'antennes actives
H01Q 19/00 - Combinaisons d'éléments actifs primaires d'antennes avec des dispositifs secondaires, p.ex. avec des dispositifs quasi optiques, pour donner à une antenne une caractéristique directionnelle désirée
An optical modulator is provided with a substrate (1) having an electro-optical effect; two optical waveguides (3a, 3b) formed at the substrate; a buffer layer (2) formed on the substrate; a traveling wave electrode (4) comprised of a central conductor (4a) arranged over the buffer layer and ground conductors (4b, 4c); and a ridge portion structured with concave portions (9a-9c) formed by grooving at least a part of the substrate in a region with a high intensity of electric field of a high frequency electric signal going along the travelling wave electrode, wherein the ridge portion is comprised of a central conductor ridge portion (8a) over which the central conductor is formed and a ground conductor ridge portion (8b) over which the ground conductors are formed, and one of the two optical waveguides is formed at the central conductor ridge portion. In the optical modulator, the concave portions are arranged to be substantially symmetry with respect to a central line provided at the middle between the two optical waveguides and the travelling wave electrode is structured to be substantially symmetry with respect to a central line of the central conductor.
G02F 1/035 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des céramiques ou des cristaux électro-optiques, p.ex. produisant un effet Pockels ou un effet Kerr dans une structure de guide d'ondes optique
A signal analyzer for facilitating observation of a relative value, i.e., the quantity of variation in power between slots, at the time of analyzing the power of a signal which is to be measured and subjected to power control in units of slot. An analyzing section (27) detects the power value of every slot of a signal which is to be measured and received at a receiving section (6), and calculates the relative value of the power value between each slot and a slot separated therefrom by a predetermined number. A display control section (29) displays the relative values thus calculated as a graph at a display section (10) by arranging them continuously in time series.
A mobile terminal tester enabling a reduction in test time when the transmission power control function of a mobile terminal is tested. A terminal information storage unit (22) stores the step size set in the mobile terminal. When the transmission power control function of the mobile terminal is tested, a control unit (24) tests the transmission power control function by reading the step size from the terminal information storage unit (22), performing a transmission power control measurement in the step size, and then performing transmission power control measurements with step sizes other than the step size. The control unit (24) stores the step size in the terminal information storage unit (22) when the step size is set in the mobile terminal.
G01R 29/08 - Mesure des caractéristiques du champ électromagnétique
H04W 24/00 - Dispositions de supervision, de contrôle ou de test
H04W 24/06 - Réalisation de tests en trafic simulé
H04W 52/36 - Commande de puissance d'émission [TPC Transmission power control] utilisant les limitations de la quantité totale de puissance d'émission disponible avec une plage ou un ensemble discrets de valeurs, p.ex. incrément, variation graduelle ou décalages
Provided is a signal analysis device with which a user can easily observe a power transition of a desired specific slot when analyzing a CDMA signal of the time division duplex method. A slot specification unit (36) can specify a slot name of a desired slot to be observed by an observer operation. A display control unit (34) reads out the power of the slot corresponding to the slot name specified by the slot specification unit (36) among powers of the respective slots stored in an analysis unit (33), creates display data for successively arranging the powers of the slots corresponding to the specified slot names in time series in a graph display, and causes a display unit (35) to display the graph.
An optical sampling device and an optical signal monitor device are comprised of an optical synthesizing unit for synthesizing a sampling subject optical signal and a sampling optical pulse, and an electric field absorption type optical modulator. The electric field absorption type optical modulator is provided with two optical terminals for projecting and receiving light, and an electric power source terminal to apply an electric field to an optical path to connect the two optical terminals. The electric field absorption type optical modulator has a characteristic that changes an absorption rate of light propagating through the optical pathin response to the magnitude of the electric field, receives projected light through one of the two optical terminals from the optical synthesizing unit, and makes the absorption rate high when the sampling optical pulse is not incident while lowering the absorption rate when the sampling optical pulse is incident. The optical sampling device and the optical signal monitor device further include a direct current electric power source to supply a predetermined direct current to the electric power source terminal, and an optical separating unit for selectively projecting the sampling subject optical signal component out of the optical signals projected from the other terminal of the two optical terminals.
Provided is a communication test device capable of supporting analysis of a cause of a change of a data throughput of a mobile communication terminal under test. The communication test device includes: accumulation means (15) which accumulates trace data concerting a data unit based on a predetermined communication standard and throughput data concerning a throughput of a data unit transmitted and received to/from a mobile communication terminal (2); extraction means (21) which extracts the trace data and the throughput data; trace display means (24) which displays the trace data on a display unit (25); throughput display means (22) which displays a throughput of each unit time in a graph on the display unit (25); and time acquisition means (27) which acquires the time. The extraction means (21) extracts from the accumulation means (15), trace data corresponding the time specified by an operation unit (26) according to the throughput state of each unit time. The trace display means (24) performs display so that trace data corresponding to the time is specified.
H04B 7/26 - Systèmes de transmission radio, c. à d. utilisant un champ de rayonnement pour communication entre plusieurs postes dont au moins un est mobile
A sampling optical pulse generating section emits sampling optical pulses of a period different from an integral multiple of the clock cycle for a data signal modulating an optical signal which is the object of monitoring by a predetermined offset time. An optical sampling section samples the optical signal by using an electroabsorption optical modulator, which has a characteristic that the absorptivity to the light propagating through the optical path varies with the magnitude of the electric field. The optical signal is made to enter one of the two optical terminals of the electroabsorption optical modulator. The sampling optical pulsesare made to enter the other optical terminal through an optical coupler. Because of the mutual absorption saturation characteristic of the electroabsorption optical modulator caused when the sampling optical pulses enter the other terminal, the absorptivity to the optical signal is decreased, and thus the optical signal undergoes sampling. As a result, the optical pulse signal is made to exit from the other optical terminal through the optical coupler.
G02F 1/015 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des éléments à semi-conducteurs ayant au moins une barrière de potentiel, p.ex. jonction PN, PIN
H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmission; Dispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
An optical signal monitoring device comprises an optical interference section, a sampling optical pulse generating section, an optical sampling section, a photoelectric converter, and a computing section. The optical interference section includes an optical splitter, a delay device, an optical phase adjuster, and an optical multiplexer. The optical splitter splits an optical signal to be monitored and phase-modulated at a predetermined symbol rate into two optical signals transmitted through two optical paths. The delay device imparts a delay equivalent to an integral multiple of one symbol to one of the two split signals. The optical phase adjuster adjusts the phases of the optical signal exiting from the delay device and the other optical signal of the two split optical signals so that the difference between the two phases may be a predetermined optical phase difference. The optical multiplexer multiplexes the optical signals whose phases are adjusted so that the phase difference is the predetermined one, converts the phase-modulated optical signal to be monitored into an intensity-modulated optical signal, and outputs it. The sampling optical pulse generating section generates sampling optical pulses of periods involving a difference of a predetermined offset time from an integral multiple of the symbol clock cycle corresponding to the predetermined symbol rate. The optical sampling section emits an optical pulse signal by sampling the intensity-modulated optical signal with the sampling optical pulses.
G02F 1/015 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des éléments à semi-conducteurs ayant au moins une barrière de potentiel, p.ex. jonction PN, PIN
H04B 10/07 - Dispositions pour la surveillance ou le test de systèmes de transmission; Dispositions pour la mesure des défauts de systèmes de transmission
Provided is an optical phase-modulation evaluating device capable of evaluating the modulated state of an optical phase-modulated signal more precisely than the prior art. An optical phase-modulation evaluating module (10) comprises a bit delay device (15) disposed on the optical paths of a third light (103) and a fifth light (105), for giving an optical path length corresponding to the delay of one bit of a symbol rate, and an optical phase-difference setter (16) for giving a delay of a predetermined optical phase excepting zero, to at least one of a ninth light (109) and a tenth light (110). The optical phase-difference setter (16) includes a transparent plate (16a) disposed on the optical path of the ninth light (109), and a transparent plate (16b) disposed on the optical path of the tenth light (110).
G01J 9/00 - Mesure du déphasage des rayons lumineux; Recherche du degré de cohérence; Mesure de la longueur d'onde des rayons lumineux
H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmission; Dispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
22.
RANDOM ERROR DISTRIBUTION EVALUATION METHOD AND EVALUATION DEVICE
It is possible to quantitatively judge the compatibility of a digital signal 'a' to the Poisson distribution. A digital signal 'a' having a predetermined error ratio E and random error data is divided into 10 measurement units each having the number of data Na decided according to the error ratio. The measurement units are acquired for a predetermined number of samples 'n'. Measurement is performed by using the number of errors contained in each of the measurement units as a measurement value k. The generation frequency f is calculated for each of measurement values k1 to km so as to calculate the Poisson distribution function having the measurement value as a variable. The coupling degree between the Poisson distribution and the generation frequency distribution of the respective measurement values is decided by using the Chi-square goodness of fit test.
An electroabsorption optical modulator used as an element for sampling comprises two optical terminals for inputting/outputting a light beam and a power supply terminal for imparting an electric field to an optical path connecting the two optical terminals and has a characteristic that the absorptivity to the light propagating through the optical path varies with the magnitude of the magnetic field. The optical signal which is the object of monitoring (synchronous sampling) is made to enter one of the two optical terminals. A predetermined DC voltage exhibiting a high absorptivity to the optical signal is applied to the power supply terminal. A sampling optical pulse is made to enter the other optical terminal through an optical coupler. Because of the mutual absorption saturation characteristic of the electroabsorption optical modulator caused when the sampling optical pulse enters the other terminal, the absorptivity to the optical signal is decreased, and thus the optical signal undergoes synchronous sampling. As a result, the optical signal is made to exit from the other optical terminal through the optical coupler.
G01J 11/00 - Mesure des caractéristiques d'impulsions lumineuses individuelles ou de trains d'impulsions lumineuses
H04B 10/07 - Dispositions pour la surveillance ou le test de systèmes de transmission; Dispositions pour la mesure des défauts de systèmes de transmission
G01M 11/00 - Test des appareils optiques; Test des structures ou des ouvrages par des méthodes optiques, non prévu ailleurs
G02F 1/015 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des éléments à semi-conducteurs ayant au moins une barrière de potentiel, p.ex. jonction PN, PIN
H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmission; Dispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
24.
SEMICONDUCTOR OPTICAL DEVICE, SEMICONDUCTOR LASER USING THE SEMICONDUCTOR OPTICAL DEVICE, AND OPTICAL TRANSPONDER USING THE SEMICONDUCTOR LASER
For the transition from a nonreflected state to a state of reflecting only the light having a target wavelength with a high wavelength selectivity, a semiconductor optical device comprises an n-type substrate, an n-type clad formed in a part of the n-type substrate itself or over the n-type substrate, a p-type clad layer over the n-type substrate, a guide layer formed between the p-type clad layer and n-type clad layer and adapted to guide light, first and second electrodes formed on the bottom of the n-type substrate and the top of the p-type clad layer respectively, and current limiting members arranged near the guide layer regularly along the light guide direction of the guide layer. The current limiting members exhibit refractive indexes approximately equal to those of the surrounding materials, produce a current density distribution regular along the light guide direction of the guide layer within the guide layer while current is injected between the first and second electrodes, and produce a refractive index distribution regular along the light guide direction of the guide layer within the guide layer according to the regular current density distribution. With this, out of the light entering the guide layer, only the light having the wavelength determined by the regular refractive index distribution is reflected.
H01S 5/12 - Structure ou forme du résonateur optique le résonateur ayant une structure périodique, p.ex. dans des lasers à rétroaction répartie [lasers DFB]
25.
MOBILE COMMUNICATION TERMINAL TRANSMISSION POWER CONTROL METHOD AND MOBILE COMMUNICATION TERMINAL TRANSMISSION POWER CONTROL DEVICE
A transmission power increasing section repetitively transmits a transmission power increase request from a tester to increase the transmission power of the mobile communication terminal by a predetermined value to the mobile communication terminal at predetermined intervals. A block size extracting section receives physical channels from the mobile communication terminal at every transmission of a transmission power increase request and extracts block size information representing the transmittable data block size determined according to the maximum transmission power set for a first physical channel from a predetermined second physical channel. A storage section stores the block size information acquired at least by one extraction by the block size extracting section. A maximum output power state determining section compares the value of the newly extracted block size information with the immediately previous block size information stored in the storage section, stops the transmission power increasing section to transmit the transmission power increase request if the value of the newly extracted block size information is smaller than that of the immediately previous block size information stored in the storage section, and transmits a transmission power decrease request to decrease the transmission power of the mobile communication terminal by a predetermined value.
H04B 7/26 - Systèmes de transmission radio, c. à d. utilisant un champ de rayonnement pour communication entre plusieurs postes dont au moins un est mobile
H04B 1/707 - Techniques d'étalement de spectre utilisant une modulation par séquence directe
H04W 24/06 - Réalisation de tests en trafic simulé
H04W 52/14 - Analyse séparée de la liaison montante ou de la liaison descendante
H04W 52/22 - Commande de puissance d'émission [TPC Transmission power control] le TPC étant effectué selon des paramètres spécifiques tenant compte des informations ou des instructions antérieures
H04W 52/34 - Gestion du TPC, c. à d. partage de la quantité limitée de puissance entre les utilisateurs ou les canaux ou encore les types de données, p.ex. charge des cellules
H04W 52/36 - Commande de puissance d'émission [TPC Transmission power control] utilisant les limitations de la quantité totale de puissance d'émission disponible avec une plage ou un ensemble discrets de valeurs, p.ex. incrément, variation graduelle ou décalages
26.
OPTICAL TIME DOMAIN REFLECTOMETER AND METHOD FOR TESTING OPTICAL FIBER USING OPTICAL PULSE
When a measurement position is specified by a marker during real time measurement, a marker level acquisition unit acquires a waveform level from waveform data stored in a waveform memory. A level comparison unit judges whether the waveform level acquired by the maker level acquisition unit is within an effective measurement level range set in accordance with a currently selected attenuator (ATT) value. If the level comparison unit judges that the waveform level is out of the effective measurement level range, an ATT value modification unit modifies the ATT value to a new ATT value so that the waveform level is contained in the corresponding effective measurement level range. According to the new ATT value, a control performs measurement of an optical fiber to be measured so that a waveform can be observed with a preferable SN ratio above a predetermined value according to the measured waveform displayed on a screen of a display unit.
Provided is an optical modulator comprising an optical waveguide (3) and a traveling-wave electrode (4), which includes an interaction unit (9) for modulating the phase of a light, and an inputting field-through unit (7). The optical modulator further comprises at least one impedance conversion unit for reducing the impedance mismatch between the characteristic impedance of the interaction unit and the characteristic impedance of at least one of the inputting field-through unit, a connector to be electrically connected with the inputting field-through unit and an external circuit. The impedance conversion unit has a characteristic impedance, which is different from the geometrical mean of the characteristic impedance of the interaction unit and the characteristic impedance of the inputting field-through unit, the geometrical mean of the characteristic impedance of the interaction unit and the characteristic impedance of the connector, or the geometrical mean of the characteristic impedance of the interaction unit and the characteristic impedance of the external circuit.
G02F 1/03 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des céramiques ou des cristaux électro-optiques, p.ex. produisant un effet Pockels ou un effet Kerr
28.
SEMICONDUCTOR LIGHT EMITTING ELEMENT AND VARIABLE WAVELENGTH LASER LIGHT SOURCE
[PROBLEMS] To provide a semiconductor light emitting element having a discretionary variable wavelength characteristic. [MEANS FOR SOLVING PROBLEMS] A semiconductor light emitting element is provided with a semiconductor substrate (11); an active layer (12) formed in a strip shape on the semiconductor substrate (11), for emitting light and guiding waves of light; embedded layers (13a, 13b) formed on a side surface of the active layer (12); a clad layer (16) formed above the active layer (12) and the embedded layers (13a, 13b); a first electrode (17a) formed above the clad layer (16); and a second electrode (17b) formed below the semiconductor substrate (11). The active layer (12) is opened at a prescribed angle to a normal line of one end surface (14a) of the both end surfaces formed by cleavage. A partially heating means (15) for heating a part of a prescribed length in a light waveguide direction of the active layer (12) is formed above the first electrode (17a) at a position thermally independent from the one end surface (14a).
The transmitting part of a short-pulse radar, which includes a first pulse generating part, a second pulse generating part, an oscillator and a switch, radiates, into a space, predetermined short-pulse waves that causes no interferences with an RR radio wave emission inhibiting band and an SDR band, while complying with a specified spectrum mask as a UWB short-pulse radar. The first pulse generating part outputs, in a predetermined period, a first pulse having a longer width than the short-pulse waves. The second pulse generating part outputs a second pulse having a width corresponding to the width of the short-pulse waves while the first pulse generating part is outputting the first pulse. The oscillator oscillates only while the first pulse generating part is outputting the first pulse. The switch is in an ON-state to pass the output signal from the oscillator only while the second pulse generating part is outputting the second pulse. In this way, the output signal from the switch is radiated into the space as the predetermined short-pulse waves.
G01S 7/03 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe - Détails de sous-ensembles HF spécialement adaptés à ceux-ci, p.ex. communs à l'émetteur et au récepteur
G01S 7/292 - Récepteurs avec extraction de signaux d'échos recherchés
It is an object to provide a data identification device and an error measurement device which are not necessary for processing of a phase continuous sweep, which can set a clock phase to the most suitable state with respect to a data signal, and which keep the most suitable state for a long time. The data identification device is comprised of a delay circuit (34) which delays a data signal (Dc) output from an identifying circuit (31) by one bit, a first phase detector (35) for detecting a phase difference between a data signal (Db) input to the identifying circuit (31) and the data signal (Dc) output from the identifying circuit (31), a second phase detector (36) for detecting a phase difference between the data signal (Dc) output from the identifying circuit (31) and the data signal (Dd) output from the delay circuit (34), a third phase detector (37) for outputting a voltage which is a base with respect to output values of the first and second phase detectors(35) and (36), and a phase control means (38) for controlling a phase of a variable delay circuit (32) so that an output value (P1) of the first phase detector (35) is made to be equal to an intermediate value between an output value (P2) of the second phase detector (36) and a basic voltage (P3) of the second phase detector (36).
H04L 7/02 - Commande de vitesse ou de phase au moyen des signaux de code reçus, les signaux ne contenant aucune information de synchronisation particulière
H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p.ex. réseaux de mise en forme adaptatifs
31.
WAVEFORM SHAPING DEVICE AND ERROR MEASURING DEVICE
It is possible to provide a waveform shaping device and an error measuring device capable of performing a waveform shaping process at a position where a sufficient amplitude is available for an input data signal even when the input data signal has a small amplitude and a code having a completely different mark ratio is used. The waveform shaping device (21) includes: voltage detection means (22) for detecting an input data signal (Da) and acquiring its amplitude and the amplitude center voltage; reference voltage generation means (23) for generating a reference voltage corresponding to the amplitude center voltage; and a comparator (25) for comparing the input data signal (Da) and the reference voltage. The waveform shaping device (21) further includes: correction information output means (27) for outputting correction information ΔV for correcting the error of the amplitude center voltage detected by the voltage detection means (22) according to the mark ratio (M) of the input data signal (Da) and the amplitude of the input data signal; and correction means (28) for correcting the reference voltage (or the DC offset value of the input data signal) inputted to the comparator (25) by the correction information ΔV.
H03K 5/08 - Mise en forme d'impulsions par limitation, par application d'un seuil, par découpage, c. à d. par application combinée d'une limitation et d'un seuil
H03K 5/26 - Circuits présentant plusieurs entrées et une sortie pour comparer des impulsions ou des trains d'impulsions entre eux en ce qui concerne certaines caractéristiques du signal d'entrée, p.ex. la pente, l'intégrale la caractéristique étant la durée, l'intervalle, la position, la fréquence ou la séquence
A data signal generating apparatus that, though having a small-scale structure, can output serial data in a desired sequence without exhibiting an unstable state even for a wide range of data rate and also can support a jitter measurement. In the data signal generating apparatus, a synchronizing means (25), which synchronizes a data output part (11) with a multiplexer (13), comprises a phase comparator (16) that compares the phase of a data synchronization clock CKp, which is outputted by the data output part (11) in synchronism with a timing of updating parallel data, with the phase of a signal A which is obtained by frequency dividing a reference clock CK1 by m in the multiplexer (13) and which decides the timing of a serial converting operation; a variable delay unit (30) of quadrature modulator type that imparts a desired delay to a data request signal A'; and a control part (26) that controls, in accordance with an output from the phase comparator (16), a DC control signal to be supplied to the variable delay unit (30), thereby synchronizing the parallel data update timing of the data output part (11) with the serial converting operation of the multiplexer (13).
H04L 7/08 - Commande de vitesse ou de phase au moyen de signaux de synchronisation les signaux de synchronisation revenant cycliquement
H03K 5/00 - Transformation d'impulsions non couvertes par l'un des autres groupes principaux de la présente sous-classe
H03K 5/135 - Dispositions ayant une sortie unique et transformant les signaux d'entrée en impulsions délivrées à des intervalles de temps désirés par l'utilisation de signaux de référence de temps, p.ex. des signaux d'horloge
It is possible to provide a signal-under-test analyzing device capable of identifying a test pattern having a high error ratio or a test pattern causing a bit error easily as compared in the prior art. The signal-under-test analyzing device (4) for analyzing a signal under test and causing a display device (21) to display the analysis result includes a test signal generation device having: an analysis result statistical unit (34) for statistically processing the analysis result for each division obtained by dividing the analysis section set for the signal under test; and a display control unit (23) causing the display device (21) to display the statistical result obtained by the analysis result statistical unit (34) for each of divisions. When a division is specified as a new analysis section, the analysis result statistical unit (34) statistically processes an analysis result of the signal under test for each new division obtained by dividing the new analysis section and the display control unit (23) causes the display device (21) to display the statistical result obtained by the analysis result statistical unit (34) for each new division.
G01R 31/319 - Matériel de test, c. à d. circuits de traitement de signaux de sortie
G06F 11/22 - Détection ou localisation du matériel d'ordinateur défectueux en effectuant des tests pendant les opérations d'attente ou pendant les temps morts, p.ex. essais de mise en route
It is possible to provide a test signal generation device capable of generating a test signal for testing a device under test which dynamically transits from a state to another. The test signal generation device includes: a pattern storage unit (20) for storing a plurality of patterns; a pattern selection unit (23) for selecting one pattern from the plurality of patterns; a test signal generation unit (25) for generating a test signal having the pattern selected by the pattern selection unit (23);a trigger signal reception unit (21) for receiving at least one type of trigger signal; and a pattern map storage unit (22) for storing a pattern map indicating the number of times the test signal generation unit (25) repeatedly generates, for each of the patterns, the test signal having the pattern and operation of the pattern selection unit (23) of each type of the trigger signal when a trigger signal is received by the trigger signal reception unit (21) while the test signal generation unit (25) is repeatedly generating the test signal having the pattern.
An orthogonal modulator separates I and a Q channel signals that are orthogonal to each other from a first signal input as a local signal, provides the I and Q channel signals with DC voltages, respectively, and outputs a second signal with a desired phase delay with respect to the first signal in response to the DC voltages. A phase comparator detects a phase difference &thetas; between the first and second signals. A setting unit sets the desired phase delay. A control unit controls the DC voltages supplied to the I and Q channel signals of the orthogonal modulator to make an output value corresponding to the phase difference &thetas; detected by the phase comparator equal to a value corresponding to the desired phase delay set by the setting unit, so that the DC voltages Vi and Vq for the I and Q channel signals are satisfied with Vi = cos &thetas; and Vq = sin &thetas;., respectively.
A rectilinear polarization antenna includes a dielectric substrate, a ground plate conductor superposed on one side of the dielectric substrate, a rectilinear polarization type antenna element formed on the opposite side of the dielectric substrate, a plurality of metal posts having first ends connected to the ground plate conductor and penetrating the dielectric substrate in the thickness direction and second ends extending to the opposite surface of the dielectric substrate and arranged at a predetermined interval so as to surround the antenna element, thereby constituting a cavity, a frame-shaped conductor having, for example, a triangular portion arranged to extend a predetermined distance in the antenna element direction and short-circuiting the second ends of the metal posts along the arrangement direction on the opposite side of the dielectric substrate. The rectilinear polarization antenna can suppress generation of a surface wave by the cavity and the frame-shaped conductor so that the antenna radiation characteristic is a desired one. Moreover, by utilizing the resonance phenomenon of the cavity, the frequency characteristic of the antenna gain can have a sharp notch in the RR radio emission inhibited band. This is effective to reduce the radio interference with the EESS and the radio astronomic job.
H01Q 9/46 - Antennes résonnantes avec une pluralité d'éléments ayant des parties sensiblement rectilignes, mutuellement inclinées avec éléments rigides divergents à partir du même point
H01Q 1/38 - Forme structurale pour éléments rayonnants, p.ex. cône, spirale, parapluie formés par une couche conductrice sur un support isolant
H01Q 21/06 - Réseaux d'unités d'antennes, de même polarisation, excitées individuellement et espacées entre elles
37.
OPTICAL TIME DOMAIN REFLECT METER, AND OPTICAL FIBER MEASUREMENT METHOD AND OPTICAL FIBER MEASUREMENT SYSTEM USING THE SAME
In order to perform various characteristic evaluations of laid optical fibers easily and efficiently, a table file for correlating a target optical fiber and measured data of the optical fiber with each other is created in an external terminal on the basis of optical fiber management information given before the execution of a laying/maintaining work, such as various pieces of information on the target optical fiber or information on the execution site. An OTDR measures the target optical fiber on the basis of the table file created at the external terminal, and stores the measured result data, in which the measured optical fiber and the measured data of the optical fiber are correlated, and edited result data expressing the edited contents at the time when the table file or the measured result data was edited. The external terminal makes a report on the basis of the measured result data and the edited result data stored in the OTDR.
It is possible to provide a semiconductor photo-element having an oblique end face of appropriate reflectivity and an oblique end face of low reflectivity and capable of being applied to an EC-LD or SLD and to provide an external resonance laser having the semiconductor photo-element. The semiconductor photo-element includes a waveguide (1G) containing a stripe-shaped active layer formed on a semiconductor substrate (11) and a first end surface (1TL) and a second end surface (1TH) which are cleavage planes parallel to each other. The normal line of the first end face (1TL) and the optical axis of the waveguide (1G) in the vicinity of the first end face (1TL) define a first angle (&phgr;L) which is not zero. The normal line of the second end face (1TH) and the optical axis of the waveguide (1G) in the vicinity of the second end face (1TH) define a second angle (&phgr;H) which is not zero and different from the first angle (&phgr;L). A first spot size (&ohgr;L) in the width direction of the waveguide (1G) in the vicinity of the first end face (1TL) is different from a second spot size (&ohgr;H) in the width direction of the waveguide (1G) in the vicinity of the second end face (1TH).
An optical modulator is provided with a Mach-Zehnder waveguide, which is provided with a substrate (1) having electro-optical effects; an optical waveguide (12) formed on the substrate (1) for guiding light waves; and an advancing wave electrode (4) which is formed on one side of the substrate (1) and composed of a center conductor (4a) for high frequency electric signal for applying a high frequency electric signal for modulating light, and a plurality of grounding conductors (4b, 4c). The optical waveguide (12) is provided with a plurality of interacting optical waveguides (12a, 12b) for modulating phase of light by applying a high frequency electric signal to the traveling wave electrode (4). The center conductor (4a) and the grounding conductors (4b, 4c) are arranged so that the widths of the interacting optical waveguides (12a, 12b) are at least partially different from each other and an efficiency of the high frequency electric signal and that of interaction of light propagating in the mutual action optical waveguides (12a, 12b) are substantially equal.
G02F 1/035 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des céramiques ou des cristaux électro-optiques, p.ex. produisant un effet Pockels ou un effet Kerr dans une structure de guide d'ondes optique
A dielectric leakage wave antenna in which both transmission characteristics of a dielectric image line for a radiating section and those of a microstrip line for an exciting section are satisfied while enhancing efficiency by such an arrangement as a dielectric substrate has a lower layer portion and an upper layer portion bonded onto the lower layer portion. A ground plate conductor forming the dielectric image line for making an electromagnetic wave propagate through the dielectric substrate direction in a direction intersecting its thickness direction perpendicularly is formed, as one surface side of the dielectric substrate, on the lower surface of the lower layer. A plurality of leakage metal strips provided in parallel at a predetermined interval on the opposite side of the dielectric substrate are formed on the upper surface of the upper layer of the dielectric substrate. A line metal strip forming the microstrip line with the ground plate conductor constituting the exciting section, and a branching means for branching an electromagnetic wave propagating on the microstrip line to a direction intersecting the plurality of leakage metal strips in the dielectric substrate are formed between the upper and lower layers of the dielectric substrate.
H01Q 13/28 - Antennes constituées par un guide non résonnant à ondes de fuite ou une ligne de transmission; Structures équivalentes produisant un rayonnement le long du trajet de l'onde guidée comportant des éléments présentant des discontinuités électriques et espacées dans la direction de la propagation de l'onde, p.ex. élément diélectrique ou élément conducteur formant diélectrique artificiel
H01Q 13/26 - Guide d'onde en surface constitué par un seul conducteur, p.ex. bandes conductrices
H01Q 19/10 - Combinaisons d'éléments actifs primaires d'antennes avec des dispositifs secondaires, p.ex. avec des dispositifs quasi optiques, pour donner à une antenne une caractéristique directionnelle désirée utilisant des surfaces réfléchissantes
An optical modulator is provided with a light guide (3) formed on a substrate (1) having electro-optical effects; a traveling wave electrode (4), which is formed on a side of one plane of the substrate (1), and is composed of a center conductor (4a) for a high frequency electric signal for applying a high frequency electric signal which modulates light, and grounding conductors (4b, 4c); and a bias electrode composed of center conductors (22a, 23a) for applying a bias voltage to light, and grounding conductors (22b, 22c, 23b, 23c). The light guide (3) is provided with a high frequency electric signal interacting section (20) for modulating the phase of light by applying a high frequency electric signal to the traveling wave electrode (4); and bias interacting sections (19, 21) for adjusting the phase of light by applying the bias voltage to the bias electrode. The bias interacting sections (19, 21) are provided to sandwich the high frequency electric signal interacting section (20) in front and rear in a light propagating direction.
G02F 1/035 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des céramiques ou des cristaux électro-optiques, p.ex. produisant un effet Pockels ou un effet Kerr dans une structure de guide d'ondes optique
42.
TIME INTERVAL MEASURING APPARATUS AND JITTER MEASURING APPARATUS USING THE SAME
In order to stably measure input time intervals of pulse signals with high precision, a time interval measuring apparatus has a reference signal generator, a phase shifter, first and second A/D converters, an error correcting part, an instantaneous-phase calculating part, and a time interval calculating part. The phase shifter receives a sinusoidal-wave reference signal of a predetermined frequency from the reference signal generator and output first and second signals that are out of phase with respect to each other. The first and second A/D converters sample the first and second signals from the phase shifter, respectively, at the input timings of measurement pulse signals. The error correcting part corrects a DC offset error, a phase error with respect to 90 degrees, and an amplitude error that have occurred in each of sample values from the first and second A/D converters. The instantaneous-phase calculating part calculates, based on the corrected sample values, the instantaneous phases of the reference signal. The time interval calculating part determines, based on the amount of the instantaneous phase variation, the input time interval of the pulse signals.
A communication device test signal generating apparatus wherein a sequence memory stores an order in which to read unit data including I and Q waveform data; read addresses; first sequence information including a desired signal level to be set in the unit data; and second sequence information including a frequency offset, and wherein the first and second sequence information stored in the sequence memory are sequentially used to apply a plurality of steps of frequency offsets to the I and Q waveform data in a digital stage preceding a D/A converter at predetermined frequency intervals with a predetermined carrier frequency being referenced, thereby outputting the frequency hopping test signal.
A variable wavelength semiconductor laser element comprising a wavelength control region formed in an optical waveguide including an active layer formed above a semiconductor substrate and guiding light generated in the active layer and provided, at least partially, with a diffraction grating for selecting light having a predetermined wavelength from among light generated in the active layer, first and second driving electrodes having a clad layer and an insulation layer formed above the clad layer and being formed below the semiconductor substrate and above the clad layer, a heating section formed above the insulation layer and heating the wavelength control region at least partially, first and second heating terminals provided at the heating section, and first and second connection lines for connecting the first and second driving electrodes in series through a power supply. The variable wavelength semiconductor laser can control the wavelength of light being led out from the optical waveguide by varying a current being supplied from the power supply to the first and second connection lines substantially connected in series through the heating section.
An optical modulator comprises a substrate (1) having a region (17a) where the polarization is not inverted and a region (17b) where the polarization is inverted and an optical waveguide (18) having first and second optical waveguides (18a, 18b), where an interaction section where the light propagating through first and second optical waveguides and an electric signal propagating through a traveling wave electrode composed of center conductor (19a) and grounding conductors (19b, 19c) interact with each other includes first and second interaction section (20a, 20b) polarized in mutually different directions, the center conductor is opposed to the first and second optical waveguides in the respective first and second interaction sections, and the phase of the light propagating the first and second optical waveguides is modulated in the first and second interaction sections. In the optical modulator, an optical waveguide shift section (20c) is provided between the first and second interaction sections, and the relative positions of the center conductor, the grounding conductor, and the first and second optical waveguides are interchanged in the first and second interaction sections.
G02F 1/035 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des céramiques ou des cristaux électro-optiques, p.ex. produisant un effet Pockels ou un effet Kerr dans une structure de guide d'ondes optique
A radar oscillator includes an oscillation unit and a first and a second switch circuit so as to intermittently output an oscillation signal according to a pulse signal indicating the radar wave transmission timing without causing a leak. The first switch circuit turns off power supply to an amplifier for a non-input period of the pulse signal so as to set the oscillator to an oscillation stop state and turns on power supply to the amplifier for the input period of the pulse signal to set the oscillator to an oscillation state. The second switch circuit turns on power supply to an LC resonator to supply a predetermined current to the LC resonator for a predetermined non-input period of the pulse signal up to the moment immediately before the input of the pulse signal and turns off power supply to the LC resonator at the timing when the pulse signal is inputted so as to stop supply of the predetermined current to the LC resonator, thereby promoting the start of the oscillation operation of the oscillator.
H03B 5/06 - Modifications du générateur pour assurer l'amorçage des oscillations
H03B 5/08 - Eléments déterminant la fréquence comportant des inductances ou des capacités localisées
H03B 5/12 - Eléments déterminant la fréquence comportant des inductances ou des capacités localisées l'élément actif de l'amplificateur étant un dispositif à semi-conducteurs
H03B 5/18 - Elément déterminant la fréquence comportant inductance et capacité réparties
A transmission unit emits a short pulse wave satisfying a predetermined spectrum mask from an antenna to a space. A reception unit receives a reflected wave of the short pulse wave from an object existing in the space. According to an output signal from the reception unit, a signal processing unit analyzes the object. The transmission unit includes a pulse generator for outputting a pulse signal of a predetermined width at a predetermined cycle and a burst oscillator for receiving the pulse signal outputted from the pulse generator, performing oscillation for a time corresponding to the width of the pulse signal, and outputting the short pulse wave. The pulse signal width, frequency, and the oscillation frequency of the burst oscillator are set so that the main lobe of the spectrum of the short pulse wave is substantially entirely included in the range from 24.0 to 29.0 GHz in the predetermined spectrum mask and a radiation power density for the RR radio emission-inhibited band of the predetermined spectrum mask is lower than the radiation power density of the peak of the main lobe by 20 dB or more.
H01Q 9/40 - Elément ayant une surface rayonnante étendue
H01Q 21/06 - Réseaux d'unités d'antennes, de même polarisation, excitées individuellement et espacées entre elles
H03B 5/06 - Modifications du générateur pour assurer l'amorçage des oscillations
H03B 5/12 - Eléments déterminant la fréquence comportant des inductances ou des capacités localisées l'élément actif de l'amplificateur étant un dispositif à semi-conducteurs
A pair pulse generator generates a pair of pulses including a first pulse of predetermined width and a second pulse of the same width as the first pulse delayed from the first pulse each time a transmission instruction signal is received. A burst oscillator performs oscillation operation while the pair of pulses is being inputted and outputs a signal of a predetermined carrier frequency as a first burst wave in synchronization with the first pulse and as the second burst wave in synchronization with the second pulse. When no pair of pulses is being inputted, the oscillation operation is stopped. A transmission unit radiates the first burst wave as a short pulse wave into a space to be searched. A reception unit receives a reflected wave and detects the second burst wave as a local signal. A control unit variably controls the interval between the first pulse and the second pulse.
G01S 7/28 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe - Détails des systèmes à impulsions
H03B 5/06 - Modifications du générateur pour assurer l'amorçage des oscillations
49.
ANALOG-TO-DIGITAL CONVERTER DEVICE OF IMPROVED TIME INTERLEAVING TYPE, AND HIGH-SPEED SIGNAL PROCESSING SYSTEM USING THE DEVICE
An A/D converter device of time interleaving type stores a correction information memory in advance with correction information necessary for correcting an error between the individual signals which are outputted by an N-number of A/D converters. In order to acquire data necessary for a correction processing for a short time period, a signal generator inputs a calibration signal, which has a plurality of signal components individually positioned at desired frequencies within a band having an upper limit of N/2 times as high as the frequency (Fs) of a sampling clock fed to each of the N-number of A/D converters and appearing in different frequencies within a band having an upper limit of one half of the frequency (Fs) of the sampling clock, to the N-number of A/D converters. A correction information calculation unit determines the amplitude and phase of the plural signal components by subjecting the calibration signal to a spectral analysis with respect to the A/D converted signals outputted by the N-number of A/D converters, with respect to the correction signal, and determines the correction information newly on the basis of the amplitude and phase, thereby to update the contents of the correction information memory with the correction information newly determined.
SEMICONDUCTOR OPTICAL ELEMENT HAVING WIDE LIGHT SPECTRUM EMISSION CHARACTERISTICS, METHOD FOR FABRICATING THE SAME, AND EXTERNAL RESONATOR TYPE SEMICONDUCTOR LASER
A semiconductor optical element comprising a semiconductor substrate, and an active layer having a plurality of quantum wells consisting of a plurality of barrier layers formed above the semiconductor substrate and a plurality of well layers sandwiched by the plurality of barrier layers. At least one of the plurality of well layers comprises an InxaGa(1-xa)As film wherein the composition ratio xa of In is any value in the range of approximately 0.05 to approximately 0.20. Consequently, the semiconductor optical element is formed as a strained well layer where the lattice strain occurring in the well layer is any value in the range of approximately 0.35% to approximately 1.5%, and the strained well layer is formed to have a band gap wavelength different from that of other well layers. Consequently, the semiconductor optical element is constituted to present wide light spectrum characteristics having a central wavelength from approximately 800 nm to approximately 850 nm and a spectral half peak width of a predetermined value or above.
H01L 33/00 - DISPOSITIFS À SEMI-CONDUCTEURS NON COUVERTS PAR LA CLASSE - Détails
H01S 5/343 - Structure ou forme de la région active; Matériaux pour la région active comprenant des structures à puits quantiques ou à superréseaux, p.ex. lasers à puits quantique unique [SQW], lasers à plusieurs puits quantiques [MQW] ou lasers à hétérostructure de confinement séparée ayant un indice progressif [GRINSCH] dans des composés AIIIBV, p.ex. laser AlGaAs
51.
CIRCULARLY POLARIZED ANTENNA AND RADAR DEVICE USING IT
A circularly polarized antenna comprises a dielectric substrate, a base conductor joined to one side of the dielectric substrate, a circularly polarized antenna element formed on the opposite side of the dielectric substrate, metal posts one end of each of which is connected to the base conductor and extends through the dielectric substrate in the direction of the thickness, the other end of each of which extends to the opposite side of the dialectic substrate, and which are so arranged at predetermined intervals as to surround the antenna elements and define a cavity, and a frame conductor provided on the opposite side of the dielectric substrate, short-circuiting the other ends of the metal posts in the arrangement direction, and extending by a predetermined distance in the antenna element direction. In the circularly polarized antenna, no surface wave is produced thanks to the cavity and frame conductor to realize desired antenna radiation characteristics. The circularly polarized antenna has a frequency characteristic of the antenna gain which has a sharp notch in the RR radio wave radiation inhibition range by using the cavity resonance phenomenon. Therefore, radio wave interference with EESS and radio astronomy operation is effectively reduced.
H01Q 11/04 - Antennes non résonnantes, p.ex. antennes à onde progressive avec partie coudée, repliée, formée, blindée ou comportant une charge électrique pour obtenir dans le rayonnement la relation de phase désirée entre des sections choisies de l'antenne
H01Q 1/38 - Forme structurale pour éléments rayonnants, p.ex. cône, spirale, parapluie formés par une couche conductrice sur un support isolant
H01Q 21/24 - Combinaisons d'unités d'antennes polarisées dans des directions différentes pour émettre ou recevoir des ondes polarisées circulairement ou elliptiquement ou des ondes polarisées linéairement dans n'importe quelle direction
52.
HIGH-FREQUENCY ELECTRONIC SWITCH, BUST WAVE GENERATION DEVICE USING THE SAME, AND SHORT PULSE RADAR USING THE SAME
A high-frequency electronic switch includes: a signal input terminal to which a switchable high-frequency signal is inputted; a plurality of amplification circuits formed by transistors cascade-connected in a plurality of stages to the signal input for successively amplifying the switchable high-frequency signal; a signal output terminal connected to an output unit of the amplification circuit of the last stage of the amplification circuits for outputting the switchable high-frequency signal successively amplified; a control terminal to which a pulse signal having a first level period as a switching signal and a second level period is inputted; and a supply current control circuit. When the pulse signal inputted tot he control terminal is in the first level period, the supply current control circuit supplies a work current to each of the transistors of the amplification circuits so that the amplification circuits are in the amplification operation state. When the pulse signal is in the second level period, the supply current control circuit stops supply of the work current to each of the transistors of the amplification circuits so that the amplification circuits are in the non-amplification state. This high-frequency electronic switch opens and closes between the signal input terminal and the signal output terminal so that they can be isolated in a high-frequency way depending on the level of the pulse signal inputted to the control terminal, thereby effectively suppressing a high-frequency signal leak during a closed mode.
H03K 17/60 - Commutation ou ouverture de porte électronique, c. à d. par d'autres moyens que la fermeture et l'ouverture de contacts caractérisée par l'utilisation de composants spécifiés par l'utilisation, comme éléments actifs, de dispositifs à semi-conducteurs les dispositifs étant des transistors bipolaires
A vehicle has a vehicle speed acquisition section (9) for detecting the speed of movement of the vehicle and outputting a vehicle speed signal. Further, a radar device has a signal creation section (2) for creating a signal to be outputted to space and outputting the created signal, a transmission side amplifier (3) for amplifying the output signal of the signal creation section (2), a transmission antenna (4) for emitting the output signal of the transmission side amplifier (3) to the space, a reception antenna (5) for receiving a reflected wave from an object present in the vicinity and outputting the wave, a reception side amplifier (6) for amplifying the output signal of the reception antenna (5) and outputting the result, a signal processing section (8) for calculating, based on the output signal of the reception side amplifier (6), the distance from the vehicle to the object and/or relative speed, as seen from the vehicle, to the object, and a gain setting section (10) for setting a gain of the transmission side amplifier and/or a gain of the reception side amplifier based on the output signal of the vehicle speed acquisition section (9).
B60R 21/00 - Dispositions ou équipements sur les véhicules pour protéger les occupants ou les piétons ou pour leur éviter des blessures en cas d'accidents ou d'autres incidents dus à la circulation
G01S 13/93 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques pour prévenir les collisions
54.
SMALL AND LOW POWER CONSUMPTION SHORT PULSE RADAR HAVING TIME LAG BETWEEN TRANSMISSION AND RECEPTION ARBITRARILY VARIABLE WITH HIGH TIME RESOLUTION AND ITS CONTROL METHOD
A short pulse radar and its control method wherein the first level transition timing of a variable period pulse outputted from a variable period pulse generator including a direct digital synthesizer (DDS) after receiving an instruction of search is employed as a reference timing, a signal making a level transition at the reference timing or after a fixed time lag from the reference timing is generated and outputted as a transmission trigger signal, and a signal making a level transition with a time lag equal to a half of the period of the variable period pulse or an integral multiple of the period from the output timing of the transmission trigger signal is generated and outputted as a reception trigger signal. Time lag between the transmission trigger signal and the reception trigger signal can be made variable by previously making the frequency data of the DDS variable depending on the relation between the frequency data stored in a memory and the time lag between transmission and reception. Consequently, the time lag between transmission and reception can be made variable arbitrarily with high time resolution and low power consumption through a simple arrangement.
G01S 7/28 - DÉTERMINATION DE LA DIRECTION PAR RADIO; RADIO-NAVIGATION; DÉTERMINATION DE LA DISTANCE OU DE LA VITESSE EN UTILISANT DES ONDES RADIO; LOCALISATION OU DÉTECTION DE LA PRÉSENCE EN UTILISANT LA RÉFLEXION OU LA RERADIATION D'ONDES RADIO; DISPOSITIONS ANALOGUES UTILISANT D'AUTRES ONDES - Détails des systèmes correspondant aux groupes , , de systèmes selon le groupe - Détails des systèmes à impulsions
G01S 13/10 - Systèmes pour mesurer la distance uniquement utilisant la transmission de trains discontinus d'ondes modulées par impulsions
55.
COMPACT-SIZE, LOW-POWER-CONSUMPTION, SHORT-PULSE RADAR AND ITS CONTROL METHOD
A transmitting section radiates a short-pulse wave into the space. A receiving section comprises a branch circuit for receiving the reflected short-pulse wave radiated into the space and in-phase branching the signal of the reflected wave into first and second signals and a detecting circuit composed of a linear multiplier linearly multiplying the first and second signals and a lowpass filter for extracting the baseband component from the output signal of the linear multiplier. A signal processing section analyzes an object present in the space on the basis of the output of the signal processing section. A control section performs a predetermined control on at least either the transmitting or receiving section according to the analysis result of the signal processing section.
A digital signal offset adjuster comprises a capacitor (21) for allowing the high-frequency components of an input digital signal to pass to an output terminal (20b) so as to transmit a wide-band digital signal without causing waveform distortion, a first coil (23) having one end connected to an input terminal (20a) and the other end to which the low-frequency and DC components pass, a second coil (22) having one end connected to the output terminal, an operation amplifier (31a) having a first input terminal connected to the other end of the first coil, a second input terminal connected to a DC voltage generator (25) and an output terminal connected to the other end of the second terminal and adapted to output a signal generated by subtraction combining of the low-frequency and DC components and the DC bias voltage, and a frequency characteristic compensating circuit (35) connected between the second input terminal of the operational amplifier and a reference potential point and adapted to increase the gain of the operational amplifier much for the higher frequency component of the low-frequency components of the input digital signal made to pass to the other end of the first coil.
There is provided a missing packet measurement device capable of preventing erroneous decision that a packet is missing when packets transmitted via the same transmission path are received in the order different from the transmission order. The missing packet measurement device (8) measures a packet lost on the transmission path by periodically attaching a sequence number to packets and receiving the packets transmitted in parallel via a plurality of transmission paths. The missing packet measurement device (8) includes a counter unit (11) for counting the number of receptions of the packet having a sequence number for each sequence number and a missing packet judgment unit (12) for judging whether each packet is missing according to the number of receptions counted by the counter unit (11). The missing packet judgment unit (12) compares the value of the maximum number of receptions subtracted by the minimum number receptions counted by the counter unit (11) to a predetermined threshold value, thereby judging whether each packet is missing.
H04L 12/707 - Prévention ou récupération du défaut de routage, p.ex. reroutage, redondance de route "virtual router redundancy protocol" [VRRP] ou "hot standby router protocol" [HSRP] par redondance des chemins d’accès
A radar apparatus (1) comprises a reception antenna (9), a pulse width detecting part (e.g., a detector (141)), a memory (13), a comparing part (e.g., a comparator (142)), and an output part (15). The pulse width detecting part detects the pulse width of a reflected pulse signal obtained from a reflected wave received by the reception antenna (9). The memory (13) stores correspondence information between type information indicative of the types of objects to be detected and pulse width information related to the pulse widths of reflected pulse signals obtained when the types of the objects are detected. The comparing part compares each pulse width information stored in the memory (13) with the pulse width detected by the pulse width detecting part, and selects the type information corresponding to the pulse width information indicative of the detected pulse width. The output part (15) outputs the type indicated by the type information selected by the comparing part.
G01S 7/292 - Récepteurs avec extraction de signaux d'échos recherchés
G01S 13/93 - Radar ou systèmes analogues, spécialement adaptés pour des applications spécifiques pour prévenir les collisions
G01N 22/00 - Recherche ou analyse des matériaux par l'utilisation de micro-ondes ou d'ondes radio, c. à d. d'ondes électromagnétiques d'une longueur d'onde d'un millimètre ou plus
B60R 21/00 - Dispositions ou équipements sur les véhicules pour protéger les occupants ou les piétons ou pour leur éviter des blessures en cas d'accidents ou d'autres incidents dus à la circulation
A pulse pattern generator (11) comprises a pulse generating section (12) having amplitude value setting section (13, 13a), and a low-pass filter (14). The pulse generating section (12) generates a pulse signal composed of a step wave varying stepwise at least at the rise or fall of the signal. The low-pass filter (14) smoothes the pulse signal generated by the pulse generating section (11) and outputs the smoothed signal. The amplitude value setting section (13, 13a) adjusts the amplitude value of the step wave constituting the pulse signal so as to set the shape of the eye waveform of when the output from the low-pass fitter (14) is eye-patterned according to a preset value. The pulse pattern generator (11) enables the low-pass filter (14) to output a pulse signal having a desired pulse pattern having a preset predetermined eye opening degree.
H03K 3/78 - Circuits pour produire des impulsions électriques; Circuits monostables, bistables ou multistables engendrant un train unique d'impulsions ayant une caractéristique prédéterminée, p.ex. un nombre prédéterminé
H04B 10/07 - Dispositions pour la surveillance ou le test de systèmes de transmission; Dispositions pour la mesure des défauts de systèmes de transmission
H04B 10/079 - Dispositions pour la surveillance ou le test de systèmes de transmission; Dispositions pour la mesure des défauts de systèmes de transmission utilisant un signal en service utilisant des mesures du signal de données
H04B 10/2507 - Dispositions spécifiques à la transmission par fibres pour réduire ou éliminer la distorsion ou la dispersion
An waveguide type optical device comprises an optical waveguide formed on a substrate, a functional optical waveguide provided in the optical waveguide, at least one of an optical input end face and an optical output end face provided for the optical waveguide at the substrate end faces, i.e., at the longitudinal ends of the substrate, and at least one of an input optical waveguide for linking the optical input end face and the functional optical waveguide and an output optical waveguide for linking the optical output end face and the functional optical waveguide. At least one of the input optical waveguide and the output optical waveguide is formed to make an angle other than zero with respect to the functional optical waveguide on at least one side of the optical input end face and the optical output end face, and to make an angle other than 90 degrees with respect to the substrate end faces on the individual sides. DRAWING FIG. 1: a ELECTRIC SIGNAL OUTPUT
G02B 6/122 - Elements optiques de base, p.ex. voies de guidage de la lumière
G02B 6/125 - Courbures, branchements ou intersections
G02B 6/30 - Moyens de couplage optique pour usage entre fibre et dispositif à couche mince
G02F 1/035 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des céramiques ou des cristaux électro-optiques, p.ex. produisant un effet Pockels ou un effet Kerr dans une structure de guide d'ondes optique
An optical modulator comprising an optical waveguide consisting of an input optical waveguide, a branch optical waveguide dividing incident light to the input optical waveguide into two, two interaction optical waveguide for modulating the phase of light by applying a voltage between a central electrode and a ground electrode, a multiplex optical waveguide for multiplexing rays propagating on two interaction optical waveguide, and an output optical waveguide being connected with the multiplex optical waveguide through a multiplex point, all formed on a substrate exhibiting electrooptic effect. At least one of high-order-mode rays produced by multiplexing phase modulated rays and radiated from the multiplex point into the substrate as two radiation rays without propagating the output optical waveguide substantially is detected by a monitor photodetector. The output optical waveguide is formed while being deformed such that at least one optical axis of two radiation rays and the end of the output optical waveguide are located while spaced apart by a specified distance at the substrate end part on the output optical waveguide side and mounting space of the monitor photodetector can be ensured.
G02F 1/035 - Dispositifs ou dispositions pour la commande de l'intensité, de la couleur, de la phase, de la polarisation ou de la direction de la lumière arrivant d'une source lumineuse indépendante, p.ex. commutation, ouverture de porte ou modulation; Optique non linéaire pour la commande de l'intensité, de la phase, de la polarisation ou de la couleur basés sur des céramiques ou des cristaux électro-optiques, p.ex. produisant un effet Pockels ou un effet Kerr dans une structure de guide d'ondes optique
62.
RADAR OSCILLATOR CAPABLE OF PREVENTING LEAKAGE OF OSCILLATION OUTPUT
It is possible to intermittently output the oscillation signal depending on a pulse signal indicating the transmission timing of a radar wave without causing any leakage. Instead of the configuration of the conventional radar oscillator in which the output route of an oscillation signal is closed/opened by means of a switch, the operation of the oscillating section (21) of the radar oscillator itself is alternately switched between oscillating state and oscillation stop state by means of a switch (30).
H03K 3/282 - Générateurs caractérisés par le type de circuit ou par les moyens utilisés pour produire des impulsions par l'utilisation, comme éléments actifs, de transistors bipolaires avec réaction positive interne ou externe utilisant un moyen de réaction autre qu'un transformateur utilisant au moins deux transistors couplés de façon que l'entrée de l'un dérive de la sortie de l'autre, p.ex. multivibrateur astable
H03B 5/06 - Modifications du générateur pour assurer l'amorçage des oscillations
H03B 5/08 - Eléments déterminant la fréquence comportant des inductances ou des capacités localisées
H03B 5/12 - Eléments déterminant la fréquence comportant des inductances ou des capacités localisées l'élément actif de l'amplificateur étant un dispositif à semi-conducteurs
brevets
