Apparatus and method for the generation of modulated optical signals using a semiconductor laser
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United States of America Patent
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Mar 23, 1993
Grant Date -
N/A
app pub date -
Dec 10, 1991
filing date -
Dec 21, 1990
priority date (Note) -
Expired
status (Latency Note)
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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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