Semiconductor laser noise reduction

Details Semiconductor laser noise reduction Semiconductor laser noise reduction

1991-05-14

1993-03-30

Scott, Jr., Leon

Coherent light generators

Particular operating compensation means

372 20, 372 29, 372 18, H01S 300

Patent

active

051990385

ABSTRACT:
Amplitude or intensity noise in the output of a laser in detuned operation is reduced by application of a frequency dependent transfer function which exploits amplitude-phase coupled noise described by the linewidth enhancement parameter .alpha. by applying an inverse of a replica of the amplitude noise recovered from the phase noise to the laser output. The noise canceling amplitude is applied to the laser output by a filter whose frequency dependent transfer function is related to the inverse of the amplitude-phase noise transfer function of the laser producing the output. The appropriate transfer function may be selected and/or adjusted in response to the magnitude of the amplitude noise. The intensity noise may be reduced by the factor 1/(1+.alpha..sup.2) which may squeeze the intensity noise below normal quantum limits.

REFERENCES:
patent: 4464759 (1984-08-01), Haus et al.

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