Apparatus and method for linearizing the operation of an external optical modulator
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United States of America Patent
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May 11, 1993
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N/A
app pub date -
Sep 12, 1990
filing date -
Sep 12, 1990
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Expired
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Abstract
A modulating signal is predistorted to linearize the output of an optical intensity modulator. The modulating signal is split into first and second paths. In the first path, the signal is phase shifted. In the second path, distortion components are introduced. The phase shifted signal from the first path is then combined with the distorted signal from the second path to provide a predistorted signal for use in modulating a light source. The distortion generator can comprise a diode pair coupled with opposite polarities in parallel. Both diodes are forward biased, and the pair is coupled in series with the input signal to provide the desired predistortion.
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