Correlation-control QPSK transmitter
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United States of America Patent
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Jul 9, 2013
Grant Date -
Apr 19, 2012
app pub date -
Oct 15, 2010
filing date -
Oct 15, 2010
priority date (Note) -
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Abstract
An optical transmitter utilizing a multi-level data modulator to produce a PDM-QPSK signal, a one-bit delay interferometer configured to correlate the multi-level data modulated signal and an optical filter configured to combine the correlated multi-level data modulated signal with one or more neighboring signals prior to transmitting over one of a plurality of optical channels. The PDM-QPSK correlated signal is configured to reduce the signal spectrum thereby increasing spectral efficiency of the transmitted signal.
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