Semiconductor laser driving circuit

Details Semiconductor laser driving circuit Semiconductor laser driving circuit

1991-02-04

1992-11-10

Epps, Georgia Y.

Coherent light generators

Particular component circuitry

Optical pumping

372 29, 372 31, H01S 304

Patent

active

051630630

ABSTRACT:
A semiconductor laser driving circuit has a semiconductor laser for emitting a laser beam according to a drive power. A photodetector is provided for effecting photo-electric conversion of the laser beam to output a corresponding electric signal. A monitoring circuit is connected for monitoring the electric signal to output a monitor signal indicative of variation in intensity of the laser beam. A controlling circuit is connected for comparing the monitor signal with a given reference signal to output a control signal according to difference therebetween. A powering circuit is operative according to the control signal to apply to the semiconductor laser a drive power effective to eliminate the difference. An abnormality detecting circuit is provided for comparing the monitor signal with a given limit signal which is set different from the reference signal to detect abnormality to output an abnormality signal.

REFERENCES:
patent: 4751743 (1988-06-01), Ishino
patent: 4924473 (1990-05-01), Burgyan et al.
patent: 4955029 (1990-09-01), Lecoy et al.
patent: 5018155 (1991-05-01), Miyari
Technical Digest of the European Conference on Optical Communication 1987, vol. 1, pp. 453-456, 1987.

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