Automatic modulation control apparatus

Details Automatic modulation control apparatus Automatic modulation control apparatus

1987-07-01

1988-12-06

Sikes, William L.

Coherent light generators

Particular beam control device

Optical output stabilization

372 38, H01S 313

Patent

active

047899875

ABSTRACT:
A circuit used in conjunction with RF modulating a laser diode and controlling the bias point is presented. The novel function is the amplitude and level shifting modulation of the drive signal at two different low (non-RF) frequencies. The light output is then detected to ascertain the relative amounts of the two different frequencies. The amplitude modulated signal appearing in the light output rises as there is increased distortion due to clipping on the threshold side or knee of the light current curve of the diode, and the amount of the level shifting modulation frequency signal drops with increased amounts of clipping. The two signals are used to derive a feedback signal to control the amplitude of the drive signal to maintain the relative detected amounts of the two signals appearing in the light output at a given ratio.

REFERENCES:
patent: 4369525 (1983-01-01), Breton et al.
Electronics Letters, Nov. 23rd 1978, vol. 14, No. 24 p. 775 by D. W. Smith.
IEEE 13th Inter. Conference on Circuits and Systems, 1980 p. 926, D. W. Smith et al. "Laser Level Control for High Bit etc.".

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