Fujikura Limited

Nippon Telegraph and Telephone Corporation

Yoshie Sajima

Mizuki Isaji

Ken Osato

Yusuke Yamada

Naoki Okada

Shinya Hamaguchi

Hisaaki Nakane

Tomoaki Kaji

Masayoshi Yamanaka

Takashi Matsuzawa

Daisuke Kakuta

Akira Murata

Naoki Nakagawa

Kouji Tomikawa

Yukiko Take

Yukihiko Shibata

An optical fiber ribbon is formed by connecting a plurality of optical fiber colored core wires to each other with a connector formed of a UV curable resin. Each of the optical fiber colored core wires includes: a bare optical fiber; a primary layer that comprises a UV curable resin that covers the bare optical fiber; a secondary layer that comprises a UV curable resin that covers the primary layer; and a colored layer disposed outside the secondary layer and that comprises a colored UV curable resin. The primary layer has a Young's modulus that is greater than or equal to 75% of a saturated Young's modulus of the primary layer.

Optical fiber ribbon, optical fiber cable, and method of manufacturing optical fiber ribbon

An optical fiber colored core wire includes: a bare optical fiber; a primary layer that comprises a UV curable resin that covers the bare optical fiber; a secondary layer that comprises a UV curable resin that covers the primary layer; and a colored layer disposed outside the secondary layer and that comprises a colored UV curable resin. The primary layer has a Young's modulus that is greater than or equal to 70% of a saturated Young's modulus of the primary layer.

Optical fiber colored core wire, optical fiber cable, and method of manufacturing optical fiber colored core wire

[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

[Objective] To detect abnormalities in optical fibers by using a phenomenon specific to optical fiber tapes including plural optical fibers arranged parallel to each other and connected together intermittently. [Solution] This optical fiber tape manufacturing method involves: a step of forming connecting parts that connect together adjacent optical fibers among a plurality of optical fibers arranged parallel to each other while applying tension to the optical fibers, and thus forming an optical fiber tape in which the connecting parts are intermittently disposed; a step of reducing the tension applied to the optical fiber tape; and a step of measuring a thickness of the optical fiber tape with reduced tension from a direction parallel to a tape plane on a path of the optical fiber tape.

Optical fiber tape manufacturing method, abnormality detection method, and manufacturing system

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

Sakura, Japan

Yoshie Sajima