Nippon Telegraph and Telephone Corporation

Fujikura Limited

The Furukawa Electric Co., Ltd.

Shinya Hamaguchi

Ken Osato

Yusuke Yamada

Naoki Okada

Hisaaki Nakane

Daisuke Kakuta

Akira Namazue

Yoshie Sajima

Naoki Nakagawa

Mizuki Isaji

Takashi Matsuzawa

Yukihiko Shibata

Yutaka Hoshino

Kouji Tomikawa

Masayoshi Yamanaka

Yuji Aoyagi

Yukiko Take

Tomohiro Ishimura

Yohei Endo

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.

Two bundle materials are provided on the outer periphery of a plurality of optical fibers. The bundle materials are twisted back while reversing the winding from front to back and vice versa to thus wind the bundle materials around the plurality of optical fibers. That is, the bundle materials are not wound spirally around the plurality of optical fibers. The bundle materials are bonded at a bonding portion where both bundle materials intersect. The bonding portion is provided along a center line of an optical fiber unit. The bundle materials are arranged in ranges which are each approximately 180&#xb0; and partitioned by the center line.

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

[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

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 optical fiber ribbon includes a plurality of optical fiber cores arranged in parallel spaced from each other; and a tape forming member having a coating portion covering an outer circumference of the optical fiber cores, and a coupling portion, integrally formed with the coating portion, intermittently coupling adjacent optical fiber cores, wherein the coating portion has an opening portion to expose a part of surfaces of the optical fiber cores, and at least a part of the coating portion is continuous in a longitudinal direction of the optical fiber cores.

Optical fiber ribbon and optical fiber cable

Growing community of inventors

Tsukuba, Japan

Shinya Hamaguchi