Laser transmitters and methods of operating same

Details Laser transmitters and methods of operating same Laser transmitters and methods of operating same

H - Electricity

01

S

325/1, 315/24

H01S 3/10 (2006.01) H01S 5/062 (2006.01)

Patent

CA 1214197

- 10 - ABSTRACT IMPROVEMENTS IN OR RELATING TO LASER TRANSMITTERS AND METHODS OF OPERATING SAME A laser has a dc bias current supplied such as to keep the laser normally above threshold, and a modulation current is supplied to bring 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.

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