Fujikura Limited

Nippon Telegraph and Telephone Corporation

Other

Fujikura Co., Ltd.

Naoki Okada

Ken Osato

Masayoshi Yamanaka

Daiki Takeda

Yusuke Yamada

Mizuki Isaji

Shinya Hamaguchi

Hisaaki Nakane

Takashi Matsuzawa

Tomoaki Kaji

Kouji Tomikawa

Yoshio Hashimoto

Daisuke Kakuta

Yukiko Take

Akira Namazue

Masayuki Ishioka

Satoru Shiobara

Matsuhiro Miyamoto

Yoshie Sajima

Shimei Tanaka

Masatoshi Ohno

Keiichiro Sugimoto

Shinichi Niwa

Naoto Ito

Tadayoshi Sayama

Michio Suematsu

Koichiro Watanabe

Yoshiyasu Satoh

Masashi Ohno

Yukiko Sato

Naoki Nakagawa

Kazuo Hogari

Hirohito Watanabe

Hideyuki Iwata

Katsuyoshi Endoh

Akira Murata

Yukihiko Shibata

Keiko Sano

Yoshiyasu Sato

Masataka Mikami

Naosuke Tani

Yasushi Kato

Takao Fukute

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 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 connecting portions 3 are each formed in such a manner as to fill resin into a gap S formed between adjacent two optical fibers 2, and both surfaces of the respective connecting portions 3 are each formed into a recess having a concave shape curved toward a center of the gap S to separate from lines 4,5 each connecting contact points of the optical fibers 2 when being placed on a horizontal surface.

Optical fiber ribbon and optical fiber cable housing optical fiber ribbon

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 ribbonincludes three or more of optical fibersarranged in parallel and connecting portionsconnecting adjacent two optical fiberstogether, the connecting portionsbeing intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction. The connecting portionsare each formed in such a manner as to fill resin into a gap S formed between adjacent two optical fibers, and both surfaces of the respective connecting portionsare each formed into a recess having a concave shape curved toward a center of the gap S to separate from lineseach connecting contact points of the optical fiberswhen being placed on a horizontal surface.

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, including: feeding the optical fiber bundle 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.

Method and device for producing optical fiber unit

An optical fiber ribbon includes a plurality of optical fibers arranged side by side in a width direction. Each of the optical fibers includes a colored section that is colored by an identification color for identifying the optical fiber from the other optical fibers. The respective colored sections of the optical fibers are formed by coloring a portion, in a length direction, of the respective optical fibers according to a common pattern.

Optical fiber ribbon, optical fiber cable, and optical fiber

An optical fiber cable is provided. The cable includes: an optical fiber core having a central axis; a presser winding covering the optical fiber core; a sheath covering the presser winding; two tension members in the sheath and facing each other with the central axis therebetween; and two rip cords facing each other with the central axis therebetween and being in direct contact with the sheath and the presser winding. The optical fiber core includes a plurality of optical fiber tapes arranged around the central axis and having mutually different stripe ring marks applied thereon. Each optical fiber tapes includes a plurality of optical fibers intermittently adhered to each other.

Method of manufacturing an optical fiber cable

[Object] In an optical fiber cable including a plurality of optical fiber units each formed by tying optical fibers in a bundle, preferable water resistance is to be achieved without increasing an outer diameter of the optical fiber cable. [Solution] An optical fiber cable includes: a plurality of optical fiber units each including a plurality of optical fibers and a bundling member wound around an outer periphery of a bundle of the plurality of optical fibers, the bundling member having a surface to which a water-absorbent granular substance is detachably attached.

Optical fiber cable

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.

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

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.

Optical fiber cable, and method and apparatus for manufacturing optical fiber cable

To make a tape length that can be supplied at one time long, and to make it possible to directly supply a tape from a record wound tape. A tape supplying method of this invention includes: connecting a tape end to an outer side of one record wound tape of a first record wound tape and a second record wound tape and a tape end to an inner side of another record wound tape, by matching a surface and a rear surface of the tapes; and after the connecting, supplying a tape of the first record wound tape and the second record wound tape from a tape end of the first record wound tape to an opposite side of a side that has been connected to the second record wound tape.

Tape supplying method and tape supplying device

[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.

Optical cable

An optical fiber unit includes: an optical fiber bundle formed by bundling a plurality of optical fibers; and a plurality of bundling members. Each of the bundling members is wound on an outer circumference of the optical fiber bundle along a length direction of the optical fiber bundle while a winding direction of the bundling member is reversed alternately, and joined with another bundling member at reverse sections where the winding direction of the bundling member 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.

Optical fiber unit and optical fiber cable

Optical fiber cable and method of manufacturing same

Provided is an optical fiber ribbon capable of concurrently ensuring mid-span access performance and cable production performance. The optical fiber ribbonincludes three or more optical fibersarranged in parallel and connecting portionsconnecting the adjacent optical fibersthe connecting portionsbeing formed intermittently in each of a ribbon longitudinal direction X and a ribbon width direction Y. The optical fiber ribbonincluding the connecting portionshaving 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.

Optical fiber ribbon and optical fiber cable housing the optical fiber ribbon

An objective of the disclosure is to improve workability in extracting optical fibers in an optical fiber unit in which a bundle of optical fibers is bundled by bundling members, and to suppress/prevent an increase in transmission loss even when tension is applied to the bundling members. This optical fiber unit includes: a plurality of optical fibers; and at least three bundling members that bundle the optical fibers into a bundle. A first bundling member, among the plurality of bundling members, is arranged along a length direction of the bundle of optical fibers so as to be wound on an outer circumference of the bundle of optical fibers. The first bundling member is joined with a second bundling member at a contact point where the first bundling member contacts the second bundling member, and is joined with a third bundling member, which is different from the second bundling member, at a contact point where the first bundling member contacts the third bundling member. The first bundling member's winding direction with respect to the bundle of optical fibers is reversed at the contact point with the second bundling member and at the contact point with the third bundling member.

Optical fiber unit, optical fiber branching method, and optical fiber cable

Growing community of inventors

Yotsukaido, Japan

Naoki Okada