The Furukawa Electric Co., Ltd.

Nippon Telegraph and Telephone Corporation

Noboru Okada

Yutaka Hoshino

Masayoshi Tsukamoto

Tetsuya Yasutomi

Keiichiro Sugimoto

Shinichi Niwa

Tatsuya Oyama

Shigeo Kimura

Shigeo Kihara

Optical fiber ribbons each comprise a plurality of optical fiber strands bonded in parallel. In the optical fiber ribbons, adjacent optical fiber strands are bonded by bonding sections that are intermittently bonded at prescribed intervals. The positions of the bonding section for all optical fiber ribbons are mutually offset in the longitudinal direction. In other words, the longitudinal-direction positions of the bonding section for the optical fiber ribbons never exactly match.

Optical fiber cable

An optical fiber ribbon comprises a plurality of optical fiber strands that are arranged side-by-side in one direction and integrated. The optical fiber ribbon comprises a plurality of optical fiber strands that are bonded in parallel. In the optical fiber ribbon, the adjacent optical fiber strands are bonded using a bonding section in which the same are continuously bonded along the entire length thereof and a bonding section in which the same are intermittently bonded at prescribed intervals. In other words, either of the bonding sections is formed between the adjacent optical fiber strands.

Loose tube-type optical fiber unit

Provided is a method for packing a cable having a static friction coefficient of 0.15 or more and 0.50 or less, a dynamic friction coefficient of 0.10 or more and 0.40 or less and a bending rigidity of 60 gf or more and 350 gf or less. The method includes the steps of: (1) winding the cable into a figure-of-eight shape to form a cylindrical cable bundle, (2) winding a wrapping film as a restraining member, which restrains the cable bundle, around an outer circumferential portion of the cable bundle, (3) winding a wrapping film as a closing member which closes openings on both ends of the cable bundle, and (4) housing the cable bundle being wound with the restraining member and the closing member in a housing container.

Method for packing cable

An optical fiber cable enabling further reduction of possibilities of disconnection of optical fiber due to, for instance, cicada oviposition. The optical fiber cable () is provided with: an optical fiber core (); a tension member (), which is arranged in parallel to the optical fiber core () on one side or on the both sides of the optical fiber core (); and a sheath () which integrally covers the optical fiber core () and the tension member (). At least one portion of the sheath () is composed of a polymeric material having a yield point stress of 12 MPa or higher.

Growing community of inventors

Tokyo, Japan

Noboru Okada