Sumitomo Electric Industries, Limited

J-power Systems Corporation

Kazuaki Negishi

Yasushi Koyano

Tetsuya Nakanishi

Masashi Onishi

Kazuhiro Sato

Yoshiaki Nagao

Takehiro Hosokawa

Itaru Sakabe

Keiichi Tanaka

Hiroyasu Sugiyama

Kousuke Tanaka

Fumiyoshi Ohkubo

Tsuyoshi Ikada

Masahiko Matsui

Toshio Akiyoshi

Hidehiko Komeda

Tsuyoshi Igi

An optical fiber ribbon comprising a plurality of the coated optical fibersarranged in plane and flame-retardant filmsandto integrate the coated optical fibersis provided. The flame-retardant filmsandhave an adhesive layerformed thereon, and a plurality of the coated optical fibersarranged in plane are integrated by the adhesive layer. The optical fiber ribbonin this constitution uses flame-retardant films, wherein the ribbon thickness can be lowered and separation of single fiber can be facilitated by tearing off the film.

Tape-like optical fiber core, production method therefor, tape core-carrying connector, tape core-carrying optical fiber array, and optical wiring system

An optical fiber temperature distribution measuring apparatus and a method for measuring optical fiber temperature distribution, provided with a light source for inputting a pulse light to an optical fiber to be measured, a signal detecting unit for detecting a received light intensity of a predetermined light included in a backscattering light generated by an input of the pulse light in the optical fiber to be measured, and a signal processing unit for calculating a value corresponding to a variation of the received light intensity due to a hydrogen molecular absorption of the optical fiber to be measured based on the received light intensity of the predetermined light, to compensate the received light intensity of the predetermined light corresponding to a temperature of the optical fiber to be measured based on the value.

Optical fiber temperature distribution measuring apparatus, method for measuring optical fiber temperature distribution, and optical fiber temperature distribution measuring system

A core part of a multimode optical fiber including the core part and a cladding part has a structure composed of a plurality of concentric layers in which a refractive index is decreased stepwise from a first core layer as an innermost layer to a third core layer as an outermost layer. The structure having the plurality of layers is formed by adjusting a quantity of addition of fluorine to silica glass. Fluorine is added to the cladding part so that a refractive index is lower than that of the third core layer as the outermost layer of the core part.

Multimode optical fiber

Growing community of inventors

Kanagawa, Japan

Kazuaki Negishi