An optical fiber ribbon according to the present invention is provided with: a plurality of optical fibers arrayed along an array direction that is perpendicular to the lengthwise direction; and a plurality of joint sections. The plurality of joint sections are each formed between a pair of the optical fibers that are adjacent to each other with respect to the array direction. The plurality of joint sections are disposed non-contiguously with respect to the lengthwise direction and the array direction. The optical fiber ribbon has a first high-density region and a low-density region that are adjacent to each other with respect to the lengthwise direction. In the first high-density region, among the plurality of joint sections, at least two joint sections having mutually different positions with respect to the lengthwise direction and the array direction are disposed. The number density of the joint sections in the low-density region is lower than the number density of the joint sections in the first high-density region. The maximum value of the amount of increase in transmission loss that occurs with light having a wavelength of 1550 nm and propagated through the optical fibers in a kink test is not greater than 1 dB.
An optical fiber cable 1 includes a multi-core optical fiber 30 including cores 32A to 32D, and a piece of arrangement information associated with the multi-core optical fiber 30, and the piece of arrangement information is associated with a core arrangement of the cores 32A to 32D in a cross-section of the multi-core optical fiber 30.
An optical cable according to the present disclosure includes a plurality of optical fiber units, the optical fiber unit including a fiber bundle constituted by a plurality of optical fibers. The plurality of optical fiber units are twisted together in an S-Z configuration by reversing the twisting direction. A twisting angle by which the optical fiber units are twisted in a circumferential direction between one reversal part, at which the twisting direction is reversed, and an adjacent reversal part is 540 degrees or greater.
An optical fiber ribbon (1) comprises five or more optical fibers (20) and a plurality of connecting parts (10) which connect two adjacent optical fibers. The plurality of connecting parts (10) are disposed intermittently in the longitudinal direction (X direction) and in an arrangement direction (Y direction). The optical fiber ribbon has a first high density region (D1), a first low density region (S1), a second high density region (D2), and a second low density region (S2). The number density of the connecting parts (10) in the first low density region (S1) is lower than the number density of the connecting parts (10) in the first high density region (D1). The number density of the connecting parts (10) in the second low density region (S2) is lower than the number density of the connecting parts (10) in the second high density region (D2). The first low density region (S1) and the second low density region (S2) are offset in the longitudinal direction (X direction).
[Problem] To improve the efficiency of accommodation of a wire material. [Solution] An accommodation unit according to the present disclosure comprises a wound body in which a wire material is wound, and an accommodating body for accommodating the wound body. The wound body includes: a first spiral portion in which the wire material is wound in a plurality of turns in a first direction, which is clockwise or counterclockwise, such that the distance thereof from the center is reduced by each turn; a first reverse portion arranged inside the first spiral portion and in which the winding direction of the wire material is reversed from the first direction to a second direction opposite to the first direction; and a second spiral portion arranged outside the first reverse portion and in which the wire material is wound in a plurality of turns in the second direction such that the distance thereof from the center is increased by each turn.
B65D 85/02 - Réceptacles, éléments d'emballage ou paquets spécialement adaptés à des objets ou à des matériaux particuliers pour des objets de forme annulaire
6.
OPTICAL FIBER CABLE AND METHOD OF MANUFACTURING OPTICAL FIBER CABLE
This optical fiber cable comprises a core, a sheath that houses the core, and a rip cord that is disposed between the core and the sheath. The core has a plurality of optical fibers, and a press-wrapping tape that wraps the plurality of optical fibers. In the press-wrapping tape, a recess recessed inward in the radial direction of the core is formed. At least part of the rip cord is located within the recess.
An optical cable according to the present disclosure includes: an optical fiber; an outer sheath configured to house the optical fiber; and a tubular reinforcement sheet located between the optical fiber and the outer sheath. In a cross section perpendicular to a length direction, the optical cable according to the present disclosure includes: a first zone in which the reinforcement sheet and the outer sheath are adhered together; and a second zone in which an adhesive strength between the reinforcement sheet and the outer sheath is weaker than the adhesive strength in the first zone.
An optical fiber cable 1 includes optical fibers 11, a wrapping tube 20 that wraps around the optical fibers 11 and contacts the outermost optical fibers 11, and a sheath 30 covering the wrapping tube 20. The sheath 30 has inner recesses 42 formed on an inner circumferential surface 40 of the sheath 30 and recessed toward a radially outer side of the optical fiber cable 1, and each of the recesses 42 forms a space 45 between the wrapping tube 20 and the sheath 30.
A conduit 1 is a conduit for laying a cable 100, and comprises a suspension wire 10, hangers 20 that are held by the suspension wire 10 and includes a through-hole 30 to accommodate the cable 100. The groove 13 has a opening 131 communicating with the through-holes 30, the opening 131 has a width less than the maximum width of the interior 132 of the groove 13.
An optical connector (1) comprises a ferrule (40) that holds an optical fiber (F), a holding part (2), a protection sleeve (81), an inner housing (30), and an outer housing (20). The holding part (20) holds the ferrule (40), and has a sleeve securing section (73). A leading end of the protection sleeve (81) is secured to the sleeve securing section (73). At least part of the sleeve securing section (73) is housed in the inner housing (30). At least part of the inner housing (30) is housed in the outer housing (20). The inner housing (30) has a radially inclinable claw part (32). The claw part (32) is configured to apply pressure to the protection sleeve (81) by inclining radially inward in a state of being located inside the outer housing (20).
To provide a novel method for winding a linear material. A housing unit according to the present disclosure includes a linear material and a housing body configured to house the linear material. In the housing body, a plurality of winding regions in which the linear material is wound are located in a circumferential direction. The linear material is wound in a figure eight in a first region pair constituted by a pair of winding regions. The linear material is wound in a figure eight also in a second region pair constituted by a pair of winding regions that are a combination of winding regions differing from the winding regions constituting the first region pair.
B65H 75/36 - Noyaux, gabarits, supports ou pièces de tenue pour matériau bobiné, enroulé ou plié, p.ex. tourets, broches, bobines, tubes à cannette, boîtes spécialement adaptés ou montés pour stocker, dérouler de façon répétée et stocker à nouveau des longueurs de matériau prévues pour des buts particuliers, p.ex. tuyaux souples à poste fixe, câbles de force n'impliquant pas l'utilisation d'un noyau ou d'un gabarit à l'intérieur du paquet de matériau stocké, p.ex. dans lequel le matériau stocké est logé dans une enveloppe ou un logement, ou engagé de manière intermittente sur une série de supports d'une
An optical fiber cable (1) is characterized in that: a plurality of optical fibers (10) having a geometric microbending loss characteristic F?BL_G and an optical microbending loss characteristic F?BL_?? is accommodated in the internal space (3S) of a sheath (3); and when specify the cable characteristics Dc of the optical fiber cable (1) using the void ratio a of the internal space (3S) and the core count b of the optical fibers (10) accommodated in the internal space (3S), the value of the microbending loss characteristic factor FµBL_G?? represented by the equation below is 1.2×10-9 or less.
An optical fiber cable (1) is characterized in that: a plurality of optical fibers (10) having a geometric microbending loss characteristic F?BL_G and an optical microbending loss characteristic F?BL_O is accommodated in the internal space (3S) of a sheath (3); and when using the void ratio a of the internal space (3S) and the core count b of the optical fibers (10) accommodated in the internal space (3S) to specify the cable characteristics Dc of the optical fiber cable (1), the value of the microbending loss characteristic factor FµBL_GO represented by the equation below is 5.2×1023 or less.
A management device according to the present disclosure manages a unit in which a long object is wound around a drum. The management device determines the remaining amount of the long object based on a matching result found by matching: matching data obtained by associating an image capture result obtained by successively capturing images of the unit while winding the long object around the drum, and a winding amount of the long object wound around the drum at the time of image capturing; and an image capture result of the unit acquired from a user terminal.
B65H 63/00 - Dispositifs d'alarme ou de sécurité utilisés pour le déroulage, le dévidage, le défilement, l'enroulage, le bobinage ou l'emmagasinage d'un matériau filiforme, p.ex. détecteurs automatiques de défectuosités ou mécanismes d'arrêt
B65H 63/08 - Dispositifs d'alarme ou de sécurité utilisés pour le déroulage, le dévidage, le défilement, l'enroulage, le bobinage ou l'emmagasinage d'un matériau filiforme, p.ex. détecteurs automatiques de défectuosités ou mécanismes d'arrêt réagissant à la livraison d'une longueur donnée du matériau, à l'achèvement de l'enroulage d'un paquet ou au remplissage d'un récipient
B65H 75/38 - Noyaux, gabarits, supports ou pièces de tenue pour matériau bobiné, enroulé ou plié, p.ex. tourets, broches, bobines, tubes à cannette, boîtes spécialement adaptés ou montés pour stocker, dérouler de façon répétée et stocker à nouveau des longueurs de matériau prévues pour des buts particuliers, p.ex. tuyaux souples à poste fixe, câbles de force impliquant l'utilisation d'un noyau ou d'un gabarit intérieur formant support pour le paquet de matériau stocké
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Kaneko, Soichiro
Ohno, Masatoshi
Namazue, Akira
Osato, Ken
Yamada, Yusuke
Maruo, Yuta
Sakurai, Akira
Tetsutani, Shigekatsu
Tanioka, Hiroaki
Abrégé
This optical fiber cable comprises a sheath, and a core having a plurality of optical fibers housed in an intertwisted state in a housing space inside the sheath. Each of the plurality of optical fibers has a glass part, a primary layer covering the glass part, and a secondary layer covering the primary layer, the value of an index Q is less than 20, and core wire drawing force when the optical fiber is drawn out is 15 N/10 m or more.
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Ohno, Masatoshi
Namazue, Akira
Osato, Ken
Yamada, Yusuke
Maruo, Yuta
Sakurai, Akira
Tetsutani, Shigekatsu
Tanioka, Hiroaki
Abrégé
An optical cable according to the present disclosure includes: a plurality of optical fiber units each having a fiber group formed by a plurality of optical fibers, wherein the plurality of optical fiber units are twisted in an S-Z configuration, at least one optical fiber unit of the plurality of optical fiber units has a filling, and the filling is wrapped around an outer circumference of the fiber group.
An optical fiber unit according to the present disclosure includes a plurality of intermittently-connected optical fiber ribbons. At least one of the optical fiber ribbons includes a plurality of optical fibers including a first optical fiber, and a second optical fiber that is longer than the first optical fiber. Conditions (AA) and c < 0.05 are satisfied, where b is an interval, in a length direction, between connection parts that connect the first optical fiber and the second optical fiber, c (%) is a fiber length difference of the second optical fiber with respect to the first optical fiber, and Y is an interval between the optical fibers in a ribbon width direction.(AA):
An optical cable of the present disclosure includes a plurality of optical fiber units. The optical fiber unit has a plurality of intermittently-coupled optical fiber ribbons. In a cross section perpendicular to a longitudinal direction, at least one of the optical fiber units is such that a length of a vector GU is shorter than a largest length of vectors MG of the plurality of the optical fiber ribbons, where the vector MG is a vector starting from a midpoint M and ending at a center of gravity G, M is the midpoint between optical fibers at both ends of each optical fiber ribbon, G is the center of gravity of the optical fiber ribbon, and the vector GU is a resultant vector of the vectors MG of the respective optical fiber ribbons.
A bundling suspension wire 1 comprises: a suspension wire 10 that includes a supporting wire 11 and a coat 12 coating the supporting wire; annular members 20 that is suspended from the suspension wire 10 and includes a through hole 21 into which cables can be inserted; and wire threading cords 40 that are inserted into through holes 21.
An optical fiber cable 1 comprises: a cable body 10 that includes optical fibers 14; a tubular external sheath 40 that accommodates the cable body 10; a protective layer 30 that is disposed between the cable body 10 and the external sheath 40; and ripcords 20A, 20B that are disposed between the cable body 10 and the protective layer 30. The protective layer 30 includes grooves 36 that is formed on an inner circumferential surface 302a of the protective layer 30 and extends along an axial direction of the cable body 10. The ripcords 20A, 20B are disposed in the grooves 36.
An optical fiber cable (1) comprises: a core (10) having a plurality of optical fibers; an interposing layer (20) formed by winding a fiber around the core (10) in an SZ-stranding manner; a reinforcing layer (31) that is made of metal and covers the interposing layer (20); and an outer covering (40) that covers the reinforcing layer (31).
An optical fiber cable (10) is provided with a core (8) having a plurality of optical fibers, a sheath (5) housing the core (8), and an interposed layer (4) disposed between the core (8) and the sheath (5) and including fibers. The fibers located from an outer end to an intermediate portion (4b) in the radial direction of the interposed layer are hardened by a matrix.
A cable includes a sheath, a cylindrical reinforcement member disposed inside the sheath, and an object to be protected disposed inside the reinforcement member. The first metal sheet and the second metal sheet overlap with each other at a joint portion. The cable reinforcement sheet includes a first side edge and a second side edge extending in a longitudinal direction. When a point included in the joint portion, located on the first side edge, and located closest to the second metal sheet in the first metal sheet is defined as a first point, and when a point included in the joint portion, located on the second side edge, and located closest to the first metal sheet in the second metal sheet is defined as a second point, the first point is located closer to the first metal sheet than the second point.
The purpose of the present invention is to provide: an optical fiber cable which can improve the ease of work of exposing a core; and a method for exposing said core.?In the method for exposing a core of an optical fiber cable (1A) according to the present invention, an incision (L) is made in an outer covering (101) along the circumferential direction at a position in the longitudinal direction closer to a first end (E1) than a second end (E2) of the optical fiber cable, the optical fiber cable (1A) is bent at the section where the incision (L) has been made to break a tension member (8), and a removal part (101a) of the outer covering (101) positioned between the incision (L) and the first end (E1) is removed.
[Problem] To enable easy management of an elongated object.[Solution] An elongated-object drum, includes: a drum on which to wind an elongated object; and a management module attached to the drum, wherein the management module includes an acceleration sensor configured to detect acceleration of the drum, a computation device configured to perform computation based on a detection result from the acceleration sensor, and a storage device configured to store therein a computation result obtained by the computation device by performing the computation based on the detection result from the acceleration sensor.
B65H 75/14 - Genres ou types de section transversale circulaire ou polygonale avec deux rebords d'extrémité
B65H 75/18 - Noyaux, gabarits, supports ou pièces de tenue pour matériau bobiné, enroulé ou plié, p.ex. tourets, broches, bobines, tubes à cannette, boîtes - Détails de structure
26.
INTERMITTENTLY CONNECTED OPTICAL FIBER RIBBON AND METHOD FOR MANUFACTURING INTERMITTENTLY CONNECTED OPTICAL FIBER RIBBON
[Problem] To suppress micro-bending losses of optical fibers when an intermittent-connection-type optical fiber tape is configured by separating the outer circumferential parts of the adjacent optical fibers from each other. [Solution] An intermittent-connection-type optical fiber tape according to the present invention is provided with: a plurality of optical fibers arrayed in the width direction; and connection units that each intermittently connects two of the optical fibers adjacent to each other. The distance between the centers of the two adjacent optical fibers is larger than the diameter of each of the optical fibers. The sum total of volume contraction amounts of the connection units per 1 m of one optical fiber is equal to or lower than 0.00070 mm3/m·°C.
This optical fiber cable production method has a delivery step for delivering a core having a plurality of optical fibers, a winding step for winding a reinforcing member onto the core and forming an overlapping section where end parts of the reinforcing member overlap in a peripheral portion, and an extrusion molding step for extrusion molding a sheath on the outside of the reinforcing member, a resin which constitutes the sheath being caused to enter into at least a portion of the overlapping section in the extrusion molding step.
To easily branch and wire an optical cable, the present invention provides an optical cable wiring method including: drawing out optical cables from cable supply sources disposed at a starting point of a first wiring path; forming a group of cables by bringing together the optical cables drawn out from the cable supply sources; and while the cable supply sources are fixed at the starting point: installing the group of cables from the starting point to a branch point on the first wiring path; dividing, at the branch point, the optical cables constituting the group of cables into a first and second groups; installing the optical cable belonging to the first group along the first wiring path located ahead of the branch point; and installing the optical cable belonging to the second group along a second wiring path branching from the first wiring path.
This optical connector is provided with an optical fiber, a ferrule, a housing, two springs, and a support part. The support part is configured by combining a first divided member and a second divided member, and has at least two latch sections that are respectively locked into two locking holes. The two latch sections are disposed side by side in an up-and-down direction, and configured to bend in the up-and-down direction when being locked into the two locking holes.
[Problem] In the work of making a holder hold multiple optical fibers detached and separated into single fibers, handling of the optical fibers is cumbersome and workability is poor.[Solution] An optical fiber arrangement method according to the present disclosure includes: preparing an intermittently connected optical fiber ribbon including a plurality of optical fibers arranged side by side at a first pitch larger than a fiber diameter; reducing a width of the optical fiber ribbon in an interior of a holder by making the holder hold a non-connecting region of the optical fiber ribbon; and arranging the plurality of optical fibers, extending out from the holder, at a second pitch smaller than the first pitch by removing connecting portions in a state where the holder is holding the plurality of optical fibers, the connecting portions connecting the plurality of optical fibers extending out from the holder to each other.
[Problem] If the surface of an optical fiber ribbon becomes rough, microbending loss increases due to irregularities formed on the surface of the optical fiber ribbon. [Solution] This intermittent-connection-type optical fiber ribbon is provided with a plurality of optical fibers that are aligned in a prescribed direction and connecting parts that intermittently connect two adjacent optical fibers. An outer peripheral coating part comprising a resin that constitutes the connecting parts is formed on the outer periphery of the optical fibers. The intermittent-connection-type optical fiber ribbon is characterized in that the arithmetic average roughness Ra of the surface of the outer peripheral coating part is no more than 0.41 µm.
This optical fiber cable comprises: a sheath; and a core that is accommodated in the sheath and that has an intermittent adhesive-type tape core wire which includes a plurality of optical fibers and a plurality of adhesive parts for intermittently adhering the plurality of optical fibers in the length direction. Recesses and protrusions are formed so as to be disposed alternatingly in the circumferential direction on the outer circumferential surface of the sheath. The recesses each include: two connection sections respectively connected to the radial inner edges of two adjacent protrusions; and a
This optical fiber cable comprises: a plurality of optical fiber units each having a plurality of optical fibers; a holding roll for wrapping the optical fiber units; at least one inclusion arranged inside the holding roll; and a sheath for coating the holding roll. A plurality of outer units located in an outermost layer from among the optical fiber units is SZ-twisted about the center axis of the cable. The inclusion is interposed between one outer unit and the holding roll in a cross-sectional view.
An optical fiber cable includes a plurality of optical fiber units each having a plurality of optical fibers, and twisted together in an SZ shape, a wrapping tube that wraps around the plurality of optical fiber units, fillings disposed inside the wrapping tube, and a sheath that covers the wrapping tube. The fillings include at least one first filling and at least one second filling that are located between adjacent two optical fiber units. The first filling is in contact with the wrapping tube and the second filling is located more radially inward than the first filling in a radial direction.
An optical fiber cable includes a first aggregate layer including a plurality of first optical fiber units that are helically twisted together in a first direction without strand-back, and each of the plurality of first optical fiber units has a plurality of optical fibers twisted together in a second direction, and the first direction and the second direction are different from each other.
An optical fiber including a core including a plurality of optical fibers, an inner filling, and a wrapping tube which wraps the plurality of optical fibers and the inner filling. The optical fiber includes an outer filling that is disposed outside the core, and a sheath that covers the core and the outer filling. The outer filling and the inner filling have water absorbency.
An amplification optical fiber 10 includes: a core 11; an inner cladding 12 having a refractive index lower than a refractive index of the core 11, wherein an active element pumped by pumping light is entirely doped to the core 11, and a relative effective refractive index difference of light in an LP01 mode is 0.05% or more and a relative effective refractive index difference of light in an LP21 mode is less than 0.05% in light propagating through the core 11.
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Ohno, Masatoshi
Tomikawa, Kouji
Osato, Ken
Tanioka, Hiroaki
Tetsutani, Shigekatsu
Endo, Yohei
Maruo, Yuta
Abrégé
This optical fiber cable (1A) is provided with: a cable main body which has a core (11) and an internal sheath (14) that contains the core; a reinforcement sheet (20) which surrounds the cable main body; an external sheath (30) which contains the cable main body and the reinforcement sheet; and an outer rip cord (12) which is embedded in the internal sheath. The internal sheath is provided with a projection (15) which protrudes radially outwardly; and at least a part of the outer rip cord is positioned inside the projection.
An intermittent connection-type optical fiber ribbon including: optical fibers aligned in a width direction of the intermittent connection-type optical fiber ribbon; and a connection part disposed between two separation spaces that are aligned in a lengthwise direction of the intermittent connection-type optical fiber ribbon and that separate adjacent ones of the optical fibers. A percentage content of the air bubbles is equal to or less than 15.5%. The percentage content of the air bubbles is a proportion of a total area of the air bubbles contained in the connection part to an area of the connection part in a section acquired by cutting the intermittent connection-type optical fiber in the width direction.
Disclosed is a cleaning tool comprising: a tool body having an extension part, the extension part including a head that presses a cleaning element onto a cleaning target, wherein the extension part includes an inner guide part through which the head is inserted, and an outer guide part through which the inner guide part is inserted, in a case of cleaning of a first optical connector, an outer peripheral portion of the outer guide part is fitted into an inner wall surface of a housing of the first optical connector, and in a case of cleaning of a second optical connector provided with a housing having a different shape from a shape of a housing of the first optical connector, an endface of the outer guide part toward the second optical connector is pressed against an endface of a housing of the second optical connector.
[Problem] To provide a cleaning tool for an optical connector, the cleaning tool being easily fittable to a housing of an optical connector to be cleaned. [Solution] A cleaning tool for an optical connector is characterized by comprising: a main body part; a substrate to which the main body part is secured; and a head unit provided with a head for pressing a cleaning body against the optical connector, and a head housing for housing the head, the head housing being formed to be fitted to a housing of the optical connector, and the head unit being provided to be movable with respect to the substrate.
Provided is an optical fiber cable 100 including a core 3 including a plurality of optical fibers 1, an inner filling 40A, and a wrapping tube 2 which wraps the plurality of optical fibers 1 and the inner filling 40A, an outer filling 40B disposed outside the core 3, and a sheath 60A that covers the core 3 and the outer filling 40B.
The present invention provides an optical fiber cable including a core including a plurality of optical fiber units each having a plurality of optical fibers; fibrous fillings extending in a longitudinal direction in which the optical fiber units extend; and a wrapping tube enclosing the plurality of optical fiber units and the fillings; a sheath that accommodates the core therein; and a pair of tension members that are embedded in the sheath so as to interpose the core therebetween, and in a transverse cross- sectional view, when a total value of cross-sectional areas of the plurality of optical fibers is Sf, a total value of cross-sectional areas of the fillings is Sb, a cross-sectional area of an inner space of the sheath is Sc, and a cross-sectional area of the wrapping tube is Sw, and it is established that 0.16 <= Sb/Sf <= 0.25 and 0.10 <= Sb/(Sc- Sw) <= 0.15.
A connector-attached optical fiber cord comprising: an optical fiber cord having a coated optical fiber and a sheath surrounding a circumference of the coated optical fiber; a ferrule attached to a front end of the coated optical fiber of the optical fiber cord; a housing that houses therein the ferrule and the optical fiber cord so that the ferrule is exposed to an exterior from a front end of the housing while the optical fiber cord extends from a rear end of the housing; a protective tube attached to a portion of the optical fiber cord in which the coated optical fiber is exposed; a boot member attached to the rear end of the housing for allowing the portion of the optical fiber cord to which the protective tube is attached to be inserted through the boot member, and a spring member disposed in the protective tube.
[Problem] To provide a novel optical cable from which an optical fiber can be easily withdrawn. [Solution] This optical cable is provided with: an optical fiber unit in which a plurality of optical fibers are surrounded by a press-winding tape; at least three tension members disposed, at intervals in the circumferential direction, on the outer side of the optical fiber unit; and an outer skin for covering the optical fiber unit and the tension members. The tension members are disposed in parallel to the optical fiber unit. The outer skin is formed between the optical fiber unit and the tension members. The inner wall surface of the outer skin formed between the optical fiber unit and the tension members protrudes further toward the center of the cable than the inner wall surface of the outer skin at which the tension members are not disposed. In the press-winding tape, a portion disposed on the inner wall surface, which protrudes toward the center of the cable, is recessed toward the center of the cable.
An optical fiber colored core provided with an optical fiber bare wire, a primary layer formed by a UV-curable resin covering the optical fiber bare wire, a secondary layer formed by a UV-curable resin covering the primary layer, and a colored layer disposed on the outside of the secondary layer and formed by a colored UV-curable resin. The Young's modulus of the primary layer is at least 70% of the saturated Young's modulus of the primary layer.
An optical fiber ribbon in which a plurality of colored and coated optical fibers are connected to each other by a connecting part formed of a UV-curable resin, wherein each of the colored and coated optical fibers is provided with a bare optical fiber, a primary layer formed of a UV-curable resin for covering the bare optical fiber, a secondary layer formed of a UV-curable resin for covering the primary layer, and a colored layer disposed on the outside of the secondary layer and formed of a colored UV-curable resin, the Young's modulus of the primary layer being at least 75% of the saturated Young's modulus of the primary layer.
Provided is an optical fiber unit provided with a plurality of optical fibers and at least two bundling members for bundling the plurality of optical fibers, wherein: the two bundling members are wrapped around the plurality of optical fibers in an SZ shape and have adhering parts formed for adhering to each other at each reversing part; and the adhering parts include a plurality of intersections of the center lines of the two bundling members with each other.
G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p.ex. câbles de transmission optique
G02B 6/04 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage formés par des faisceaux de fibres
Provided is an optical fiber unit provided with a plurality of optical fibers and at least two bundling members for bundling the plurality of optical fibers, wherein: the two bundling members are wrapped around the plurality of optical fibers in an SZ shape and have adhering parts formed for adhering to each other at each reversing part; the adhering parts follow the longitudinal direction of optical fiber unit extension; and letting L be the length of the adhering parts in the longitudinal direction and P be the bundle pitch for the bundling members in the longitudinal direction, 0.15 = L/(P/2) = 0.8 is satisfied.
G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p.ex. câbles de transmission optique
G02B 6/04 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage formés par des faisceaux de fibres
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Isaji, Mizuki
Ohno, Masatoshi
Sato, Shinnosuke
Tomikawa, Kouji
Namazue, Akira
Osato, Ken
Nakagawa, Naoki
Aoyagi, Yuji
Tetsutani, Shigekatsu
Abrégé
The optical fiber cable according to the present invention is provided with a core in which a plurality of optical fibers are gathered, an inside sheath for accommodating the core therein, a filament body embedded in the inside sheath, a pair of tension members embedded in the inside sheath with the core therebetween, a reinforcing sheet for covering the inside sheath and the filament body, and an outside sheath for covering the reinforcing sheet, the expressions ti < Ti and to < To being satisfied, where ti is the thickness of a portion of the inside sheath on the inside in the radial direction of the filament body, Ti is the thickness of a portion of the inside sheath on the inside of the pair of tension members in the radial direction, to is the thickness of a portion of the inside sheath on the outside of the filament body in the radial direction, and To is the thickness of a portion of the inside sheath on the outside of the pair of tension members in the radial direction.
An optical fiber unit including: an optical fiber bundle formed by bundling a plurality optical fibers; and a plurality of bundling members, wherein one bundling member of the plurality of bundling members is wound on an outer circumference of the optical fiber bundle in a length direction of the optical fiber bundle, while reversing a winding direction alternately, is joined to another bundling member at a section where the winding direction is reversed, and a ratio of a width of a section of the bundling member to a thickness of a section of the bundling member is less than 20.
Disclosed is a method for manufacturing an optical fiber ribbon 1 in which adjacent optical fibers 3 are connected intermittently in a length direction. The method involves: feeding the optical fibers 3 along the length direction; and applying a resin 9 intermittently in the length direction by rotating, between adjacent ones of the optical fibers 3, a rotating member 220 having a recess 220A. The moving speed V2, in the length direction, of a peripheral edge part of the rotating member 220 at a position where the peripheral edge part of the rotating member blocks the resin 9 between the optical fibers 3 is slower than the feeding speed V1 of the optical fibers 3.
G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p.ex. câbles de transmission optique
53.
OPTICAL FIBER RIBBON, METHOD FOR MANUFACTURING OPTICAL FIBER RIBBON, AND UV-CURABLE RESIN COMPOSITION USED FOR FORMATION OF CONNECTION PARTS IN INTERMITTENTLY CONNECTED OPTICAL FIBER RIBBON
Disclosed is a method for manufacturing an intermittently connected optical fiber ribbon that includes a plurality of optical fibers arranged side by side, and connection parts arranged intermittently and each connecting two adjacent optical fibers. The method involves: a step of applying, between the optical fibers, a UV-curable resin including a siloxane structure in its molecule; a step of removing a portion of the UV-curable resin applied between the optical fibers; and a step of irradiating the UV-curable resin between the optical fibers with UV rays and forming the connection parts.
G02B 6/06 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage formés par des faisceaux de fibres la position relative des fibres étant la même aux deux extrémités, p.ex. pour transporter des images
An optical connector according to the present disclosure includes: a ferrule; a first optical fiber held by the ferrule; and a clamp part that has an inserting section for inserting a second optical fiber and that secures the first optical fiber and the second optical fiber in mutual alignment. A solid refractive-index matching material is provided on an end face on the inserting-section side of the first optical fiber. On the end face of the first optical fiber, a projection projecting on the inserting-section side with reference to a central region of the end face is formed.
An optical fiber cable includes a cable main body including a core including optical fibers, at least a pair of tension members disposed so as to face each other with the core interposed therebetween, and an inner sheath covering the core and the tension members, a cylindrical outer sheath accommodating the cable main body, a reinforcing sheet provided between the cable main body and the outer sheath, the reinforcing sheet surrounding an entire circumference of the cable main body, the reinforcing sheet having an overlapping portion in which portions of the reinforcing sheet overlap each other in a portion in a circumferential direction of the cable main body, the reinforcing sheet being formed of a metal, and a rip cord provided between the reinforcing sheet and the cable main body, in which the overlapping portion of the reinforcing sheet and the rip cord are provided at different positions in the circumferential direction of the cable main body.
An optical fiber cable includes a core including a plurality of units which are assembled and each of which comprises a plurality of optical fibers which are assembled, a pair of tension members disposed so as to face each other with the core interposed therebetween, and a sheath covering the core and the pair of tension members collectively. The units are twisted so as to form a plurality of layers. The plurality of layers includes a first layer having first-layer units formed in an SZ-twisted shape and a second layer having second-layer units formed in an SZ-twisted shape. A twisting direction of the first-layer units is opposite to a twisting direction of the second-layer units in at least a portion in a cable length direction.
[Problem] To achieve a low cost means of distinguishing optical fibers which make up an optical fiber ribbon. [Solution] The present invention is an optical fiber ribbon having a plurality of optical fibers which are parallel to each other side by side across the width direction of the optical fiber ribbon. Each optical fiber has a colored section which has been colored in accordance with an identification color to distinguish each optical fiber from other optical fibers. The colored section of each of the plurality of optical fibers is formed by having a common pattern colored onto some parts along the longitudinal direction of the optical fiber.
When bundling members are wound in an S-Z configuration around an optical fiber bundle, optical fibers cannot be kept bundled if there is a defect in the joining at reverse sections where the bundling members' winding directions are reversed. The invention is an optical fiber unit including: an optical fiber bundle formed by bundling a plurality of optical fibers; and a plurality of bundling members. Each bundling member is wound on an outer circumference of the optical fiber bundle along a length direction of the optical fiber bundle while its winding direction is reversed alternately, and joined with another bundling member at reverse sections where its winding direction is reversed. A region surrounded by a pair of the bundling members to be joined at the reverse sections includes a joining point at one of the reverse sections of another pair of the bundling members.
In order to achieve, even at an increased line speed, joining of bundling members at sections where their winding directions are reversed, the invention provides a method for producing an optical fiber unit by winding at least two bundling members on the outer circumference of an optical fiber bundle formed by bundling a plurality of optical fibers. This method Involves: feeding the optical fiber bundle in a feeding direction from a fiber passage member; feeding the bundling members while forming intersection points between two of the bundling members on the outer circumference of the optical fiber bundle by feeding at least one of the bundling members from a bundling member passage part of a rotating member arranged to the outer circumference of the fiber passage member, while causing the rotating member to oscillate, with the feeding direction serving as the axis; and fusion-bonding the bundling members at their intersection points by passing the optical fiber bundle and the bundling members through a heating unit arranged downstream from the fiber passage member and the rotating member in the feeding direction, and thus forming an optical fiber unit in which the winding direction, with respect to the optical fiber bundle, of the at least one of the bundling members is reversed at a fusion-bonded point between the bundling members.
G02B 6/06 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage formés par des faisceaux de fibres la position relative des fibres étant la même aux deux extrémités, p.ex. pour transporter des images
60.
PLUG-SIDE OPTICAL CONNECTOR AND OPTICAL CONNECTOR SYSTEM
[PROBLEM] A waterproofing member is appropriately placed in a plug-side optical connector provided with a coupling section including a rotation section. [SOLUTION] The present invention is an insertion section configured to be inserted inside a cylindrical coupling section of a receptacle-side optical connector; and a rotation section configured to couple to the coupling section of the receptacle-side optical connector and to be rotatable outside the insertion section. A waterproofing member is placed on an outer peripheral surface of the insertion section inside the rotation section so as to contact an inner peripheral surface of the coupling section of the receptacle-side optical connector when the insertion section is inserted inside the coupling section of the receptacle-side optical connector.
To improve identifiability of optical fiber ribbons, an exemplary optical fiber ribbon of the invention includes: at least three optical fibers arranged side by side; and a plurality of connection parts that each connect two adjacent ones of the optical fibers, the connection parts being provided intermittently in a length direction of the optical fibers and in a width direction of the optical fibers. A marking for identifying the optical fiber ribbon is provided to each optical fiber. The position, in the circumferential direction, of the marking provided to at least one of the optical fibers is different from the position, in the circumferential direction, of the marking provided to another optical fiber.
G02B 6/06 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage formés par des faisceaux de fibres la position relative des fibres étant la même aux deux extrémités, p.ex. pour transporter des images
G02B 6/10 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage du type guide d'ondes optiques
62.
OPTICAL FIBER CONNECTION STRUCTURE AND OPTICAL FIBER CONNECTOR
An optical fiber connection structure is provided, in Which a first optical fiber and a second optical fiber, which is optically connected to the first optical fiber via a solid refractive index-matching material which is provided on a tip surface of the first optical fiber, are held and fixed between a base member and a cover member, a tip of the second optical fiber is disposed so as to come into contact with the solid refractive index matching material or separated from the solid refractive index-matching material, and the entire solid refractive index matching material and the tip of the second optical fiber are disposed in a liquid refractive index matching agent which is provided between the base member and the cover member.
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Matsuda, Takaharu
Yamaguchi, Takashi
Takizawa, Kazuhiro
Yoneda, Keisuke
Takamizawa, Kazutoshi
Aoyagi, Yuji
Nakayachi, Katsushi
Abrégé
An optical fiber splicing structure of the invention includes: an optical fiber connector that is capable of holding an optical fiber at both sides thereof in a radial direction; a receiving optical fiber that is provided inside the optical fiber connector and has a hole opening at an end face of a connection end thereof; a solid refractive index matching layer that is formed at the end face of a connection end of the receiving optical fiber and enters the hole; and an external optical fiber that is to be butt- jointed to the receiving optical fiber by being butt-jointed to the receiving optical fiber at the end faces thereof with the refractive index matching layer interposed therebetween.
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Matsuda, Takaharu
Luong, Hung Huu
Ota, Tatsuya
Takizawa, Kazuhiro
Katayose, Hiroichi
Ishizuka, Koji
Shinpo, Makoto
Toge, Kunihiro
Abrégé
An optical fiber splicer includes a fiber fixing portion, a first optical fiber fixed to the fiber fixing portion, a clamp portion which is capable of holding and fixing an extending portion extended from the fiber fixing portion of the first optical fiber and a tip portion of a second optical fiber optically connected to the extending portion of the first optical fiber between a base member and a pressing member being openable and closable with respect to the base member, and a solid index matching material which is attached to a tip surface of the extending portion of the first optical fiber and is interposed between the first optical fiber and the second optical fiber.
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Yamaguchi, Takashi
Matsuda, Takaharu
Luong, Hung Huu
Takizawa, Kazuhiro
Yoneda, Keisuke
Takamizawa, Kazutoshi
Aoyagi, Yuji
Nakayachi, Katsushi
Abrégé
In this method for producing an optical connector, a first optical fiber, in which a solid index matching material layer formed at the end surface of a second end section at the reverse side from the end surface of a first end section to be exposed at the tip of a ferrule, is grasped by a pair of grasping members from two sides in the radial direction at a position separated from the end surface at the second end section, and is inserted into the fiber hole of the ferrule from the first end section.
[Problem] The thickness on a ripcord in a circular optical cable is reduced, to improve workability. [Solution] An optical cable of the present invention includes: an optical fiber unit including optical fibers; a sheath, having a circular external form, configured to house the optical fiber unit in a housing portion; and two strength members embedded in the sheath; and two rip cords, wherein when a direction of connecting the two strength members sandwiching the housing portion is a first direction and a direction intersecting the first direction is a second direction, in a cross section of the optical cable, a cross-sectional shape of the housing portion has a dimension in the second direction greater than that in the first direction, and the two rip cords is disposed to sandwich the optical fiber unit such that a direction of connecting the two rip cords is in the second direction, in the cross section of the optical cable.
To wrap an optical fiber bundle in a press-wrapping tape while guiding the optical fiber bundle. A former of the present invention includes: (A) a guide pipe that guides an optical fiber bundle configured from a plurality of optical fibers; (B) a tape forming section that forms a press-wrapping tape from a strip shape into a helical shape, while guiding the press-wrapping tape along a feed direction, the tape forming section including a curved section that gradually curves the strip shaped press -wrapping tape while guiding the press-wrapping tape along the feed direction, and a helical section that is a helical tube shaped location further to a downstream side than a position where two edges of the curved section intersect with each other, the helical section causing two end portions of the press-wrapping tape that has been curved with the curved section to overlap and forming the press-wrapping tape into a helical shape, while guiding the press-wrapping tape along the feed direction, and gradually narrowing an external diameter of the helical shaped press-wrapping tape, wherein (C) an outlet of the guide pipe is disposed further to the downstream side than the position where the two edges of the curved section intersect with each other.
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Sajima, Yoshie
Matsuzawa, Takashi
Isaji, Mizuki
Osato, Ken
Okada, Naoki
Nakane, Hisaaki
Yamada, Yusuke
Kakuta, Daisuke
Hamaguchi, Shinya
Shibata, Yukihiko
Abrégé
Provide is an optical fiber ribbon whereby a tape forming member can be easily removed after single core separation. The present invention is provided with: a plurality of optical fiber cores (10a, 10b) arranged in parallel spaced from each other; and a tape forming member (20) having coating portions (21a, 21b) covering an outer circumference of the optical fiber cores (10a, 10b), and a coupling portion (22a), integrally formed with the coating portions (21a, 21b), intermittently coupling adjacent optical fiber cores (10a, 10b), wherein the coating portions (21a, 21b) have opening portions (31, 32) to expose parts of surfaces of the optical fiber cores (10a, 10b), and at least a part of the coating portions (21a, 21b) is continuous in a longitudinal direction of the optical fiber cores (10a, 10b).
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Yamaguchi, Takashi
Matsuda, Takaharu
Takizawa, Kazuhiro
Takamizawa, Kazutoshi
Aoyagi, Yuuji
Daido, Atsushi
Ida, Masahiro
Abrégé
An optical fiber splicing tool of the invention include: an optical fiber splicing unit (10) that includes: a mechanical splice holder that holds a mechanical splice (30); an optical fiber grasper (70) that grasps a first optical fiber at one end side of the mechanical splice (30); and a guide target that is slidable along a guide provided at a connecting jig (110) that fixes a second optical fiber to be butt-jointed to the first optical fiber, and a connecting jig (110) that includes: a guide that guides the optical fiber splicing unit (10); and an optical fiber fixer (90) that fixes the second optical fiber. The optical fiber splicing unit (10) provides a first flexure width (L ) between one end side of the mechanical splice (30) and the optical fiber grasper (70), and a second flexure width (L2) shorter than the first flexure width (L1) is ensured between the other end side of the mechanical splice (30) and the optical fiber fixer (90) when butt-jointing is carried out.
Provided is a binder fiber for an optical fiber unit including a flat sea- island color composite fiber, in which the flat sea-island color composite fiber satisfies the following (1) to (3): (1) a sea component of the flat sea-island color composite fiber has a melting start temperature of 100°C or higher and a melting peak temperature of 120°C to 150°C; (2) the flat sea-island color composite fiber has a width of 0.5 to 3.0 mm and a thickness of 0.15 mm or less; and (3) the flat sea-island color composite fiber has a thermal shrinkage rate of 1.0% or lower after being heated at 100°C for 3 hours. With the binder fiber, the color developing properties are improved, the shape retaining properties of optical fiber cores are maintained, the optical fiber cores are not compressed, and there is no adhesion with another adjacent binder fiber or the optical fiber cores.
G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p.ex. câbles de transmission optique
G02B 6/04 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage formés par des faisceaux de fibres
71.
ROUND AND SMALL DIAMETER OPTICAL CABLES WITH A RIBBON-LIKE OPTICAL FIBER STRUCTURE
Ann optical fiber cable including an optical fiber ribbon in a pipe, wherein the ribbon includes at least two optical fibers arranged side by side, and wherein at least two of the optical fibers are bonded intermittently along a length of the fibers.
G02B 6/04 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage formés par des faisceaux de fibres
G02B 6/10 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage du type guide d'ondes optiques
72.
ROUND AND SMALL DIAMETER OPTICAL CABLES WITH A RIBBON-LIKE OPTICAL FIBER STRUCTURE
An optical fiber cable including an optical fiber ribbon in a pipe, wherein the ribbon includes at least two optical fibers arranged side by side, and wherein at least two of the optical fibers are bonded intermittently along a length of the fibers.
G02B 6/04 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage formés par des faisceaux de fibres
G02B 6/10 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage du type guide d'ondes optiques
G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p.ex. câbles de transmission optique
73.
ROUND AND SMALL DIAMETER OPTICAL CABLES WITH A RIBBON-LIKE OPTICAL FIBER STRUCTURE
An optical fiber cable including an optical fiber ribbon in a pipe, wherein the ribbon includes at least two optical fibers arranged side by side, and wherein at least two of the optical fibers are bonded intermittently along a length of the fibers.
G02B 6/04 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage formés par des faisceaux de fibres
G02B 6/10 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage du type guide d'ondes optiques
G02B 6/44 - Structures mécaniques pour assurer la résistance à la traction et la protection externe des fibres, p.ex. câbles de transmission optique
74.
OPTICAL FIBER RIBBON AND OPTICAL FIBER CABLE HOUSING THE OPTICAL FIBER RIBBON
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Isaji, Mizuki
Sajima, Yoshie
Osato, Ken
Okada, Naoki
Matsuzawa, Takashi
Take, Yukiko
Yamada, Yusuke
Hamaguchi, Shinya
Kakuta, Daisuke
Nakane, Hisaaki
Abrégé
Provided is an optical fiber ribbon capable of concurrently ensuring mid-span access performance and cable production performance. The optical fiber ribbon 1 includes three or more optical fibers 2 arranged in parallel and connecting portions 3 connecting the adjacent optical fibers 2, the connecting portions 3 being formed intermittently in each of a ribbon longitudinal direction X and a ribbon width direction Y. The optical fiber ribbon 1 including the connecting portions 3 having split strength which is set in the range from 1.50 gf to 21.0 gf, contributes to exhibiting both the mid-span access performance and the cable production performance.
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Namazue, Akira
Osato, Ken
Okada, Naoki
Yamada, Yusuke
Kakuta, Daisuke
Nakane, Hisaaki
Hamaguchi, Shinya
Abrégé
Provided is an optical fiber ribbon capable of achieving higher density and reduction in diameter and accurately placing optical fibers in V-shape grooves in a fusion machine without failure. The optical fiber ribbon 1 includes three or more of optical fibers 2 arranged in parallel and connecting portions 3 each connecting adjacent two optical fibers 2 together, the connecting portions 3 being intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction. The optical fiber ribbon 1 has an outer diameter dimension of the optical fibers 2 which is set to smaller than or equal to 220 µm, and has a distance between the centers of the adjacent two optical fibers which is set to 250 30 µm.
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (Japon)
Inventeur(s)
Namazue, Akira
Take, Yukiko
Matsuzawa, Takashi
Osato, Ken
Okada, Naoki
Yamada, Yusuke
Abrégé
It is an object of the present invention to suppress a coating resin from being shaved off in an event where optical fibers are sent out from a coating dice. When a Young's modulus of ultraviolet curable resins 13 located on outermost layers of optical fibers 3 is 300 MPa or more, and the Young's modulus is 300 MPa to 600 MPa, a plurality of the optical fibers 3 in which friction force measured by the following measurement method is 0.3 N or less are arranged in parallel to one another, these respective optical fibers 3 are fixed to one another intermittently along a longitudinal direction thereof, and adhered portions 5 are formed. A ring 30a is formed of an optical fiber specimen 30, an end portion 30b on one end side of the optical fiber specimen 30 is inserted into the ring 30a so as to make a knot, and a contact portion 30d in which portions of the resin are brought into contact with each other is formed. In this state, the respective end portions 30b, 30c on both sides of the ring 30a are grasped and pulled in a direction of being spaced apart from each other, and friction force between the portions of the resin at the contact portion 30d at this pulling time is measured.
An ytterbium-doped optical fiber of the present invention includes: a core which contains ytterbium, aluminum, and phosphorus and does not contain germanium; and a cladding which surrounds this core. The ytterbium concentration in the core in terms of ytterbium oxide is 0.09 to 0.68 mole percent. The molar ratio between the phosphorus concentration in the core in terms of diphosphorus pentoxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 30. The molar ratio between the aluminum concentration in the core in terms of aluminum oxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 32. The molar ratio between the above aluminum concentration in terms of aluminum oxide and the above phosphorus concentration in terms of diphosphorus pentoxide is 1 to 2.5.
A device for bending an optical fiber and receiving light is provided with a recessed holding member having a recess, a projecting holding member having a projection projecting toward the recess, light receiving elements for receiving leak light from an optical fiber held between the recess and the projection, and a supplemental support mechanism that is substantially independent of the recess or the projection and supplementarily supports the optical fiber between the recess and the projection such that the leak light from the optical fiber is received by center of the light receiving elements.
G01M 11/00 - Test des appareils optiques; Test des structures ou des ouvrages par des méthodes optiques, non prévu ailleurs
G02B 6/00 - OPTIQUE ÉLÉMENTS, SYSTÈMES OU APPAREILS OPTIQUES - Détails de structure de dispositions comprenant des guides de lumière et d'autres éléments optiques, p.ex. des moyens de couplage
G02B 6/42 - Couplage de guides de lumière avec des éléments opto-électroniques
An ytterbium-doped optical fiber including a core containing at least ytterbium, aluminum and phosphorous and a clad surrounding the core, wherein a molar concentration of diphosphorus pentoxide with respect to phosphorus in the core is equal to a molar concentration of aluminum oxide with respect to aluminum in the core, wherein a ratio of a molar concentration of diphosphorus pentoxide with respect to phosphorus in the core to the molar concentration of ytterbium oxide with respect to ytterbium in the core is higher than or equal to 10 and lower than or equal to 30, and wherein a relative refractive index difference between the core and the clad is higher than or equal to 0.05% and lower than or equal to 0.30%.
ABSTRACT OF THE DISCLOSURE A magnetic material wire is composed of a core of magnetic material having a Curie point of 70 to 250°C and a high conductive metal sheathing of a uniform thickness covering the core. The ratio of the metal sheathing to the wire in cross-section is in the range of 15 to 40%. There is also disclosed a method of producing such a wire.
H01B 7/28 - Protection contre les dommages provoqués par des facteurs extérieurs, p.ex. gaines ou armatures par l'humidité, la corrosion, les attaques chimiques ou les conditions atmosphériques
H05B 6/00 - Chauffage par champs électriques, magnétiques ou électromagnétiques
brevets
