Semiconductor laser driving device for stabilizing the optical o

Details Semiconductor laser driving device for stabilizing the optical o Semiconductor laser driving device for stabilizing the optical o

1988-09-23

1989-11-28

Scott, Jr., Leon

Coherent light generators

Particular component circuitry

Optical pumping

372 29, H01S 300

Patent

active

048842800

ABSTRACT:
In a laser driving device for stabilizing the optical output level of a semiconductor laser, a drive circuit supplies a drive current signal to the laser. A monitoring photodiode is provided for partially receiving the optical laser output to produce an electrical monitor signal indicative of the actual output level of the laser. A differential amplifier is connected to the photodiode to serve as a comparator for receiving a reference signal indicative of a reference output level of the laser, and for detecting a difference between values of the monitor signal and the reference signal to produce a comparison signal indicative of a change in the actual optical output level of the laser. An abnormal current eliminator is connected to the comparator, for, when the laser is disenergized or just after it is driven to become operative, controlling the comparator so that the comparison signal has a limited amplitude, whereby a current component undesirably supplied as the driven current to the laser is forcibly decreased to eliminate abnormal current from flowing in the laser.

REFERENCES:
patent: 4237427 (1980-12-01), Holland
patent: 4612671 (1986-09-01), Giles
patent: 4621376 (1986-11-01), Nakamura et al.
patent: 4713819 (1987-12-01), Yoshikawa
patent: 4733398 (1988-03-01), Shibagaki et al.
patent: 4745610 (1988-05-01), Yoshikawa
Patent Abstracts of Japan, vol. 9, No. 270, (E-353), [1993], 26th Oct. 1985, & JP 60 115 278.

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