Stabilized-feedback control device for semiconductor lasers

Details Stabilized-feedback control device for semiconductor lasers Stabilized-feedback control device for semiconductor lasers

1990-12-20

1992-03-17

Davie, James W.

Coherent light generators

Particular component circuitry

Optical pumping

372 31, H01S 310

Patent

active

050974734

ABSTRACT:
A semiconductor laser control apparatus includes a semiconductor laser, a current driver connected to the semiconductor laser, a semiconductor p-i-n photodiode for generating a monitoring current, and an operational amplifier. The inverting input of the operational amplifier receives a modulated or control signal through a resistor and a feedback current based on the monitoring current. The non-inverting input of the operational amplifier receives a reference signal. When a variation in output light amount of the semiconductor laser occurs, the operational amplifier generates an error signal in accordance with the feedback current and supplies the error signal to the current driver, thereby compensating for the variation in output light amount of the semiconductor laser.

REFERENCES:
patent: 4945541 (1990-07-01), Nakayama
patent: 4995105 (1991-02-01), Wechsler
patent: 5018154 (1991-05-01), Ohashi
"Feed Forward Frequency Compensation", Chap. 2, Sec. 7-2, Operational Amplifiers, G. B. Clayton; 1979.

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