Nippon Telegraph and Telephone Corporation

Shunichi Tohno

Yoshito Shuto

Hirotsugu Sato

Makoto Nakamura

Kenji Yokoyama

Masayoshi Ohno

Shin Sumida

Michiyuki Amano

Yasuaki Tamura

Haruki Kozawaguchi

Noboru Ishihara

Shuichi Yanagi

Masanobu Okayasu

Takeshi Kurosaki

Takashi Tadokoro

An optical module capable of connecting signal lines to an external substrate easily without causing any degradation of the transmission characteristic is disclosed. The optical module comprises an optical element mounting block having an optical element mounting section and an optical fiber guide, and a wiring lead integrated resin substrate having a ferrule holding section, an optical element mounting block housing section, and wiring leads, where at least a part of the wiring leads are provided by signal lines in a coplanar guide structure entirely formed on the wiring lead integrated resin substrate such that a characteristic impedance does not change when the wiring leads are electrically connected to external wirings.

Optical module using wiring lead integrated resin substrate

A plastic split optical alignment sleeve comprising a cylindrical plastic sleeve with a slit in a side surface thereof to be arranged in an adaptor which splices optical fiber chords having inserted therethrough optical fibers and having a ferrule on each end thereof, the sleeve being capable of engaging therein the ferrules on both sides thereof to splice the optical fibers, comprises a resin composition which when injection molded exhibits an anisotropy of 1.5 or less, the anisotropy being expressed in terms of ratio of a physical property, preferably flexural modulus, in a first direction in which a resin in the resin composition flew upon injection molding and that in a second direction which is at right angles to the first direction. The resin composition contains at least one resin selected from polyetherimides, polyethersulfones, and epoxy resins and at least one inorganic substance selected from whiskers and silica powder.

Plastic split optical alignment sleeve for optical connectors and method

A plastic ferrule for an optical connector comprises a cylindrical portion having one insertion hole for fixing an optical fiber and directly related to connection, a holding portion for allowing the cylindrical portion to be stably held in an optical connector, and an guiding portion for allowing an optical fiber to be guided into the ferrule. The ferrule has a hollow, cylindrical hole centering around the insertion hole inside the cylindrical portion. Thus, the ferrule has excellent dimensional accuracy of the outer diameter, and achieves connection of single mode fibers excellent in connection reliability and economy.

Plastic ferrule for optical connector and method for production thereof

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Mito, Japan

Shunichi Tohno