Bias control of nested mach-zehnder modulators for the generation of optical QAM signals
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United States of America Patent
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Jun 18, 2019
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Jul 5, 2018
app pub date -
Dec 22, 2017
filing date -
Feb 5, 2014
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Abstract
Disclosed are bias control methods for Mach-Zehnder modulators for the generation of optical QAM signals while ensuring correct I/Q polarity of the generated optical QAM signal. One exemplary method involves temporarily offsetting I and Q biases from ideal transmission null bias points while another illustrative method temporarily makes I and Q data streams identical.
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