Binary modulation of injection lasers

Details Binary modulation of injection lasers Binary modulation of injection lasers

1992-05-28

1994-02-15

Davie, James W.

Coherent light generators

Particular beam control device

Modulation

372 31, H01S 310

Patent

active

052873668

ABSTRACT:
An injection laser driver regulates the bias and modulation depth by means of two feedback control loops, one deriving its feedback control signal from a measure of the mean optical output of the laser, and the other deriving its feedback control signal from a measure of the spectral purity of that optical output. The spectral purity measure is conveniently effected by measuring the coherence function at a specific value of differential delay using a Mach-Zehnder interferometer configuration with a passive quadrature optical network.

REFERENCES:
patent: 5003546 (1991-03-01), Lidgard et al.
patent: 5204640 (1993-04-01), Logan, Jr.
D. W. Smith et al, `Laser Level Control for High Bit Rate Optical Fibre Systems`, paper presented at 13th Circuits and Systems International Symposium Houston, Apr. 1980.

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