Coherent light generators – Particular component circuitry – Having feedback circuitry
Reexamination Certificate
2008-05-13
2008-05-13
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular component circuitry
Having feedback circuitry
C372S029015
Reexamination Certificate
active
10960021
ABSTRACT:
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 diode1to a prescribed wavelength by driving a temperature control unit to control the temperature of the laser diode1. 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 filter7into an electric signal and a target for the laser diode1to 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 fcand the zero point has a lower frequency than the cut-off frequency fcof the object of control.
REFERENCES:
patent: 2001-7438 (2001-01-01), None
patent: 2002-270954 (2002-09-01), None
Nobuhide Suda et al., PID Control, Sep. 2002, pp. 16-38.
Kawata Izumi
Mukai Akio
Peng Zhigang
Asahi Kasei Microsystems Co. Ltd.
Golub Marcia A.
Harvey Minsun
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