Abstract
This paper investigates optical coherent systems based on polarization
multiplexing and high-order modulations such as phase-shift keying (PSK) signals
and quadrature amplitude modulations (QAM). It is shown that a simple linear
receiver processing is sufficient to perfectly demultiplex the two transmitted
streams and to perfectly compensate for group velocity dispersion (GVD) and
polarization mode dispersion (PMD). In addition, in the presence of a strong
phase noise of the lasers at the transmitter and receiver, a symbol-by-symbol
detector with decision feedback is able to considerably improve the receiver
robustness with a limited complexity increase. We will also discuss the channel
estimation and the receiver adaptivity to time-varying channel conditions
as well as the problem of the frequency acquisition and tracking. Finally,
a new two-dimensional (polarization/time) differential encoding rule is proposed
to overcome a polarization-ambiguity problem. In the numerical results, the
receiver performance will be assessed versus the receiver complexity.
© 2009 IEEE
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