Laser control circuit

Details Laser control circuit Laser control circuit

1990-02-01

1991-02-19

Gonzalez, Frank

Coherent light generators

Particular component circuitry

Optical pumping

372 33, 372 31, H01S 300

Patent

active

049950452

ABSTRACT:
A laser diode control circuit maintains a desired average output power of the laser diode by detecting the optical output, amplifying the detected output, and controlling a bias current of the laser diode accordingly. A pilot tone is combined with the detected output and amplified therewith, and the amplified level of the tone is detected and used to control a modulation current for the laser diode. In one described arrangement the laser diode is controlled to have a high extinction ratio with the bias current at the knee of the diode's characteristic curve, and in another arrangement a lower extinction ratio is provided with the bias current above the knee.

REFERENCES:
patent: 3946335 (1975-02-01), De Loach, Jr. et al.
patent: 4009385 (1977-02-01), Sell
patent: 4237427 (1980-12-01), Holland
patent: 4292606 (1981-09-01), Trimmel
patent: 4385387 (1983-05-01), Trimmel
patent: 4504976 (1985-03-01), Beaudet
patent: 4677632 (1987-06-01), Lisco et al.
patent: 4744087 (1988-05-01), Nicia
Chen, F. S., Electronics Letters, "Simultaneous Feedback Control of Bias and Modulation Currents for Injection Lasers", Jan. 3rd, 1980, vol. 16, No. 1, pp. 7-8.

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