The Furukawa Electric Co., Ltd.

Fujitsu Corporation

Kazuo Kogure

Hideyuki Nasu

Hideyuki Omura

Masanori Ishii

Tomoyuki Kato

The optical output of an optical device branched by means of an optical coupler is partially fetched by means of a wavelength stabilizer that includes an FBG section, whereby the passing wavelength characteristic of a fiber grating, which is believed originally to depend little on temperature, can be prevented from further changing. The wavelength of the optical device is tuned by means of a light wavelength tuning device that includes the wavelength stabilizer. Thus, the tuned wavelength is less liable to suffer an error that is attributable to the change of environmental temperature, so that the temperature dependence of the wavelength tuning operation is lowered.

Light wavelength tuning device and light source optical demultiplexer and wavelength division multiplexed optical communication system using the tuning device

A method for manufacturing a compound semiconductor device in which a mixed crystal layer containing a III-V group compound is formed on a substrate, characterized in that when a part of the mixed crystal layer is subjected to etching by an etching liquid, the etching portion is subjected to etching while maintaining the state of not exposing light to the etching portion.

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Urawa, Japan

Kazuo Kogure