Apparatus and method for linearizing an external optical modulator
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United States of America Patent
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-
Jun 14, 1994
Grant Date -
N/A
app pub date -
Oct 20, 1992
filing date -
Oct 20, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An external optical modulator is linearized to reduce second order distortion. An optical carrier is modulated in the modulator by a pilot signal. The modulated optical carrier is sampled and an error signal is generated indicative of a phase difference between a second harmonic of the pilot signal and second order harmonics thereof present in the sampled modulated optical carrier. The error signal is fed back to the modulator to adjust the bias thereof to minimize the phase difference and thereby minimize second order distortions produced by the modulator. Where a plurality of external modulators are operated in series, each is provided with a feedback loop to minimize the second order distortions produced therein.
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