Nippon Telegraph and Telephone Corporation

The Furukawa Electric Co., Ltd.

Fujikura Limited

Yukihiko Shibata

Shinya Hamaguchi

Ken Osato

Naoki Nakagawa

Yutaka Hoshino

Yusuke Yamada

Naoki Okada

Mizuki Isaji

Yoshie Sajima

Hisaaki Nakane

Takashi Matsuzawa

Daisuke Kakuta

Yuji Aoyagi

Tomohiro Ishimura

Yohei Endo

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

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

Ibaraki, Japan

Yukihiko Shibata