Driving device for semiconductor laser

Details Driving device for semiconductor laser Driving device for semiconductor laser

1991-03-05

1992-01-28

Scott, Jr., Leon

Coherent light generators

Particular component circuitry

Optical pumping

372 26, 372 29, H01S 300

Patent

active

050848879

ABSTRACT:
A driving device for stimulating light emission of a semiconductor laser, comprises a driving circuit for applying the semiconductor laser to a pumping signal including a biasing current and a modulated signal to emit laser light from the laser source, a photosensor for detecting the laser light and outputting a detection signal representing light amount of the detected laser light, a compensating unit comprising a comparator and an integrating circuit for generating a binary-coded biasing signal for producing the biasing current while compensating fluctuation of the threshold current of the semiconductor laser on the basis of the detected signal from the photosensor every predetermined period, an adding circuit for adding the biasing signal of the compensating unit to the input modulated signal and outputting the added signals therefrom, and a constant-current circuit for generating a predetermined constant current. The constant current of the constant-current generating unit and the added signals of the adding unit are added to each other and supplied to the semiconductor laser as the pumping signal.

REFERENCES:
patent: 4689795 (1987-08-01), Yoshimoto et al.
patent: 4768198 (1988-08-01), Deki

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