Apparatus and method for the generation of modulated optical sig

Details Apparatus and method for the generation of modulated optical sig Apparatus and method for the generation of modulated optical sig

1991-12-10

1993-03-23

Healy, Brian

Coherent light generators

Particular beam control device

Modulation

372 32, 372 38, 372700, 372 43, 372 31, H01S 310

Patent

active

051970759

ABSTRACT:
A system for the generation of modulated optical signals, wherein to the d.c. bias current of a semiconductor laser (1) associated with an opto-electronic feedback circuit (2) including a delay, there are superimposed the variations of a current obtained by detecting an optical signal resulting from the combination of an optical, amplitude-modulated input signal and of the optical signal present in the feedback circuit. By a suitable choice of the modulation frequency (f2) of the input signal and of the low-frequency gain (B) of the feedback loop (2), the laser output signal is amplitude-modulated at a frequency equal to the modulation frquency (f2) of the input signal.

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