Sumitomo Electric Industries, Limited

Toyoaki Kimura

Fumiaki Sato

Taro Fujita

Ryota Fukumoto

Yohei Suzuki

Nayu Yanagawa

Yuuki Shimoda

An optical cable according to an embodiment of the present disclosure is an optical cable for installation in a microduct, the optical cable including one or more optical-fiber core wires, and a sheath layer covering an outer peripheral side of the one or more optical-fiber core wires. The sheath layer has a density of 2.0 g/cmor less. The sheath layer contains an olefin-based resin, a silicone, and a non-halogen flame retardant. A mass ratio of the non-halogen flame retardant to the olefin-based resin is 0.90 to 2.00. A mass ratio of the silicone to the olefin-based resin is 0.005 to 0.100. The olefin-based resin contains a polyethylene, and an ethylene-vinyl acetate copolymer or an ethylene-ethyl acrylate copolymer. The silicone has a weight-average molecular weight of 50,000 to 1,000,000.

Optical cable

A method for laying an optical fiber cable including a cable core, a cable sheath that includes an inner jacket and an outer jacket, and a tensile strength member, a first kinetic friction coefficient of the outer jacket being smaller than a second kinetic friction coefficient of the inner jacket to the duct, first flame retardance of the inner jacket being higher than the second flame retardance of the outer jacket. The method includes wiring the optical fiber cable in an outdoor side via the duct, drawing the optical fiber cable from the outdoor side to an indoor side, making a part of the optical fiber cable as an optical fiber cable for indoor wiring by removing the outer jacket after the drawing of the optical fiber, and wiring the optical fiber cable for indoor wiring in the indoor side.

Method for laying optical fiber cable

An optical fiber unit includes an optical fiber ribbon in which a plurality of optical fibers are arranged in parallel, and a colored bundle tape which is longitudinally wrapped or spirally wrapped around an optical fiber ribbon bundle in which the plurality of optical fiber ribbons are stranded together. One end portion in a width direction of the bundle tape and the other end portion in the width direction of the bundle tape overlap each other and are joined to each other, and the bundle tape covers an entire circumference of the optical fiber ribbon bundle.

Growing community of inventors

Osaka, Japan

Toyoaki Kimura