Nippon Telegraph and Telephone Corporation

The Furukawa Electric Co., Ltd.

Fujikura Limited

Okano Electric Wire Co., Ltd.

Shigenori Uruno

Masao Tachikura

Hisashi Izumita

Hajime Takemoto

Nobuhisa Ishii

Hitoshi Ishimaru

Kuniaki Yamaguchi

Fuminori Nakajima

Isao Nakanishi

Norihiro Momotsu

Nobuo Tomita

Yoshitaka Enomoto

Naoki Nakao

Kazuya Ogata

Katsuaki Suzuki

Arata Natsume

Koji Mine

Akira Hirooka

A holding member includes a flared tubular body and collectively holds a plurality of unused optical fibers provided with optical connectors within an optical distribution frame. The tubular body has a rectangular cross section and includes an elongated rectangular lower opening and an upper opening wider than the lower opening. A part of sidewalls of the tubular body is formed to serve as an openable cover. The cover is first opened; the optical fibers provided with the optical connectors are accommodated in the tubular body; and then the cover is closed.

Holding member for optical distribution frame and optical distribution frame

An optical fiber cord which is a single core optical fiber cord having an outer diameter of 1.2 mm or less, and has a structure in which an optical fiber core wire having a resin coating is provided at the center, a tensile-strength-fiber layer is provided around the outer periphery of the optical fiber core wire, and a coating layer is further provided around the outer periphery of the tensile-strength-fiber layer, wherein the coating layer is composed of a non-halogen fire-retardant resin, is disclosed. This optical fiber cord has excellent fire retardant, mechanical and handling properties, although the outer diameter thereof is made smaller.

Optical fiber cord

A single core optical fiber cord having an outer diameter of 1.2 mm or less, and having a structure in which an optical fiber core wire having a resin coating provided at the center, a tensile-strength-fiber layer around the periphery of the optical fiber core wire, and a coating layer around the outer periphery of the tensile-strength-fiber layer is provided. The coating layer can be composed of a non-halogen fire-retardant resin. The optical fiber cord has excellent fire retardant, mechanical and handling properties, although the outer diameter thereof is 1.2 mm or less.

An optical fiber distribution module having a connection board, optical connector adaptors and a storage section is provided. An array of the optical connector adaptors forms the connection board, where the optical connectors connect in-use optical fibers. The storage section, located in a separate section of the module, stores optical fibers which are not-in use. The optical fiber distribution module also includes a plurality of cord sorting boards having a plurality of fiber cord passageways. The fiber cord passageways are configured to accommodate and retain at least one optical fiber such that the optical fiber is arranged between the connection board and the storage section. In addition, both the in-use and not-in use optical fibers insert into the fiber cord passageway. The in-use optical fibers connect to the optical connector adaptors and the not-in use optical fibers are stored in the storage section as the in-use optical fibers and the not-in use optical fibers are inserted within the fiber cord passageways.

Optical fiber distribution module for holding an optical fiber cord and fiber distribution system using optical fiber cords

A mono-fiber type optical fiber cord comprising: a coated optical fiber which is an optical fiber with a fiber coat therearound, a synthetic resin coat having a substantially rectangular sectional surface for further covering the coated optical fiber, and a reinforcing member within the coat for coated optical fiber, wherein the reinforcing member is located along one of the shorter sides of the coat in the substantially parallel direction with the shorter sides in such a manner as to be embedded along the longitudinally extending direction of the coated optical fiber. An optical cord ribbon is formed by mutually bonding the longer sides of the adjacent substantially rectangular sectional surfaces of a plurality of the mono-fiber type optical fiber cords, and thereafter by coating the external surface of the thus aligned optical fiber cords by a bundling coating method.

Optical fiber cord and optical cord ribbon

Growing community of inventors

Tokyo, Japan

Shigenori Uruno