Method of controlling the optical power output of a laser, and c

Details Method of controlling the optical power output of a laser, and c Method of controlling the optical power output of a laser, and c

1987-03-18

1989-05-23

Sikes, William L.

Coherent light generators

Particular beam control device

Having particular beam control circuit component

372 33, 372 38, 455609, H01S 313

Patent

active

048336807

ABSTRACT:
An optical transmitter for digitally transmitting data by using NRZ pulses. The transmitter has a laser diode whose operating current consists of a bias current and a modulation current. A photodiode measures the optical performance of the laser diode. Also provided is a regulating device having a multiplier for multiplying the alternating component of a measuring signal transmitted by the photodiode with a signal beat, the latter having the frequency of the bit rate corresponding to the NRZ pulses, with the output signal of the regulating device setting the bias current via a control member to a value which is smaller, by a predetermined amount, than the laser threshold current.

REFERENCES:
patent: 4347610 (1982-08-01), Meuleman
patent: 4369525 (1983-01-01), Breton et al.
patent: 4399566 (1983-08-01), Roullet et al.
patent: 4504976 (1985-03-01), Beaudet
R. E. Epworth, "Subsystems for High Speed Optical Links", Proc. of the 2nd European Conference on Optical Fiber Communications, 1976.

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