Abstract
In this paper, the statistics of received signals in a single-channel
dispersion-managed dual-polarization fiber-optical channel are derived in the limit of
low dispersion. The joint probability density function (pdf) of the received amplitudes
and phases of such a system is derived for both lumped and distributed amplification.
The new pdf expressions are used to numerically evaluate the performance of modulation
formats over channels with nonlinear phase noise. For example, a sensitivity gain of up
to 2 dB is calculated for a specific system using polarization-multiplexed 8-ary
phase-shift keying compared with a similar single-polarization system at the same
spectral efficiency and a symbol error rate of 5 x 10<sup>-4</sup>. Moreover, the
accuracy of the derived pdf is evaluated for some single-channel dispersion-managed
fiber-optical links with different dispersion maps using the split-step Fourier
transform method.
© 2011 IEEE
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