Multi-channel optical transceiver with offset quadrature amplitude modulation
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United States of America Patent
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Dec 6, 2016
Grant Date -
Oct 31, 2013
app pub date -
Jun 26, 2013
filing date -
Jan 21, 2010
priority date (Note) -
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Abstract
The present disclosure provides a multi-carrier optical transmitter, receiver, transceiver, and associated methods utilizing offset quadrature amplitude modulation thereby achieving significant increases in spectral efficiency, with negligible sensitivity penalties. In an exemplary embodiment, an optical transmitter includes circuitry configured to generate a plurality of optical subcarriers, a plurality of data signals for each of the plurality of subcarriers, and a plurality of modulator circuits for each of the plurality of subcarriers, wherein each of the plurality of modulator circuits includes circuitry configured to offset an in-phase component from a quadrature component of one of the plurality data signals by one-half baud period.
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