Univeral Automatic Bias Control Process for Digital Transmitter
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United States of America Patent
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Issued Date -
Jul 30, 2015
app pub date -
Jan 27, 2015
filing date -
Jan 28, 2014
priority date (Note) -
Abandoned
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Abstract
An automatic bias control tracking for all modulation formats in an optical modulator includes monitoring the average output optical power using a low-speed photodetector to adjust the modulator bias. Two-level DC dithering signals are applied to two DC ports individually in time to isolate the impact of the other port while adjusting the current DC bias, thus improving the accuracy and efficiency. The power monitoring of low-frequency RF power is utilized to find a quad-point, where the in-phase and quadrature are orthogonal with each other. The total output power is used as a rule when adjusting the phase bias.
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