Laser driving means

Details Laser driving means Laser driving means

1982-10-15

1985-09-03

Davis, James W.

Coherent light generators

Particular beam control device

Modulation

372 38, 455611, 455618, H01S 310

Patent

active

045396868

ABSTRACT:
Disclosed is means for driving a laser whereby a dc bias current is supplied to keep the laser normally above threshold, and a modulation current brings the laser below threshold when a pulse appears. In one embodiment, a feedback controlled bias current source (11) and modulation current source (15) are coupled to the p-side terminal of the laser (10) while a constant voltage source (27) is coupled to the n-side terminal of the laser in a way which results in subtraction of the modulation current from the dc bias current. This mode of operation essentially eliminates laser overshoot and more nearly equalizes rise and fall times of the light pulses.

REFERENCES:
patent: 4009385 (1977-02-01), Sell
patent: 4243951 (1981-01-01), Wolkstein et al.
patent: 4339822 (1982-07-01), Kolodzey
Ostoich et al., "Direct Modulation of D. H. GaAlAs Lasers with GaAs M.E.S.F.E.T.s", Electronics Letters, vol. 11, No. 21, Oct. 16, 1975, pp. 515-516.

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