Asahi Kasei Microsystems Co., Ltd.

Akio Mukai

Izumi Kawata

Zhigang Peng

A semiconductor laser wavelength control device capable of controlling the optical wavelength constant even if the optical output intensity of the semiconductor laser varies and permitting a reduction in overall size is to be provided. It is provided with control means which controls the optical wavelength of a laser diodeto a prescribed wavelength by driving a temperature control unit to control the temperature of the laser diode. The control means has a low pass characteristic, with a first photo electric conversion signal resulting from the conversion of light having passed an optical filterinto an electric signal and a target for the laser diodeto emit light of a prescribed wavelength being entered as inputs, supplies a control signal for driving the temperature of the temperature control unit, and is set that a greater one out of a plurality of poles has a higher frequency than the cut-off frequency fand the zero point has a lower frequency than the cut-off frequency fof the object of control.

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Machida, Japan

Akio Mukai