Method for controlling the amplitude of an optical signal

Details Method for controlling the amplitude of an optical signal Method for controlling the amplitude of an optical signal

1993-10-14

1994-12-13

Goldstein, Herbert

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359186, 359161, 372 31, 375 22, H04B 1004

Patent

active

053733878

ABSTRACT:
An amplitude control scheme for a high bit rate digital optical transmitter is disclosed. The data to be transmitted by the laser is pulse-width modulated by a low frequency signal. The pulse-width modulated signal is applied to the laser via a laser driver and to a mark density reference generator. The magnitude of the low frequency components from the mark density reference generator is a signal indicative of the desired amplitude of the laser light pulses. A back-face photodiode converts a portion of the laser light into an electrical signal, the magnitude of the low frequency portion thereof being a signal indicative of the actual amplitude of the laser light pulses. The actual amplitude of the laser light pulses is computed to the desired amplitude and the laser driver output amplitude may then adjusted to compensate for variations in the laser performance.

REFERENCES:
patent: 4689795 (1987-08-01), Yoshimoto et al.
patent: 4713841 (1987-12-01), Porter et al.
patent: 5153765 (1992-10-01), Grunziger
"GaAlAs Laser Transmitter For Lightwave Transmission Systems", The Bell System Technical Journal, vol. 57, No. 6, Jul.-Aug. 1978, P. W. Schumate, Jr., F. S. Chen, and P. W. Dorman, pp. 1823-1836.
"Laser Level Control For High Bit Rate Optical Fibre Systems", 13th Circuits and Systems International Symposium Proceedings, Houston, Texas, Apr. 1980, D. W. Smith and T. G. Hodgkinson, pp. 926-930.

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