Abstract
We investigate the interaction between Kerr nonlinearity and polarization
mode dispersion (PMD) in homogeneous multi-channel polarization division multiplexing
coherent phase shift keying transmissions. Assuming linear distortions can
be fully equalized by the coherent receiver, we concentrate the investigation
on the residual nonlinear penalty. We introduce a novel simulation procedure
to discriminate intra-channel PMD, i.e., PMD within the channel, from inter-channel
PMD, i.e., PMD among different channels, showing their relative impact on
system performance in the nonlinear regime. A simple yet effective description
of intra-channel PMD is proposed, which helps identify the PMD realizations
giving the best/worst performance in the nonlinear regime. We show that on
average PMD improves the performance of dispersion-managed links by reducing
both nonlinear interactions among signals and nonlinear phase noise, while
it has no effect in non-dispersion managed links.
© 2011 IEEE
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