Ocean Cable Co., Ltd.

Mitsubishi Chemical Industries Limited

Nippon Telegraph and Telephone Public Corporation

Seitei Co., Ltd.

Kiyoshi Funaki

Kenichi Mochizuki

Yoshinori Suga

Eiji Tanaka

Nobuyuki Yoshizawa

Masatsugu Murao

Koushi Ishihara

Kazuhiko Murao

Yasuji Murakami

Jiro Ikeda

Mitsuaki Murao

Yoshinori Murao

Pressure-resistant sheath of a submarine optical fibre cable and method

Disclosed herein is an optical fiber cable produced by pumping a two-liquid mixing and curing-type polyurethane resin which has the specified values in a tensile break strength, a breaking extension, a creep characteristics and the compression modulus of elasticity, in voids surrounding the optical fibers and those surrounding tension members of the cable.

Optical fiber cable

A submarine optical fiber cable includes inner and outer dams at suitable intervals for limiting water flow in the cable. The outer dams are formed in a space between inner and outer metal tubes of a pressure resisting sheath of the cable, and the inner dams are formed in the inner tube in which an optical fiber unit is enclosed. Each dam is made of a sticky compound or a jelly of plastics resin which is loaded at the dam position. The cable is also provided with a scale which represents distance from one end of the cable.

Submarine optical fiber cable with dam means

Growing community of inventors

Yokohama, Japan

Kiyoshi Funaki