Coherent light generators – Particular component circuitry – Optical pumping
Patent
1999-01-04
2000-11-28
Lee, John D.
Coherent light generators
Particular component circuitry
Optical pumping
372 32, 372 34, H01S 50687
Patent
active
061544744
ABSTRACT:
In an optical wavelength control apparatus for a laser diode, an optical branching circuit branches a laser beam from the laser diode into first, second, and third branched laser beams. An optical band-pass filter and optical low- and high-pass filters receive the first, second, and third branched laser beams and transmit laser beams having specific optical wavelengths therethrough as transmitted beams. First, second, and third photodiodes convert output beams from these filters into electrical signals and output them as analog voltages. A comparison amplifier compares the analog voltages output from the second and third photodiodes and outputs a comparison result signal. An operational amplifier performs differential amplification of a reference analog voltage from the first photodiode and the output signal from the comparison amplifier, and outputs a control signal. A temperature adjustment element is in tight contact with the laser diode and generates heat, a temperature of which is externally controlled. A temperature adjustment circuit controls the temperature of heat from the temperature adjustment element on the basis of the control signal.
REFERENCES:
patent: 4583228 (1986-04-01), Brown et al.
patent: 4631728 (1986-12-01), Simons
patent: 5088098 (1992-02-01), Muller et al.
patent: 5118964 (1992-06-01), McArdle
patent: 5602860 (1997-02-01), Masonson
Japanese Office Action dated Aug. 31, 1999, with partial translation.
European Search Report dated Aug. 5, 1999.
Lee John D.
NEC Corporation
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