Abstract
In this paper, we experimentally investigate the tolerance of 111-Gb/s
polarization multiplexed return-to-zero differential quadrature phase-shift
keying (POLMUX–RZ–DQPSK) signals with respect to
nonlinear impairments in a link with either (inline) optical or
(receiver-side) electrical dispersion compensation. After transmission of
more than 2000 km of LEAF, a comparable nonlinear tolerance is observed for
both dispersion maps. However, we observe that in the presence of
differential group delay (DGD) the nonlinear tolerance of the transmission
link with in-line optical dispersion compensation is reduced significantly,
whereas the nonlinear tolerance of the configuration with receiver-side
dispersion compensation is virtually unaffected.
© 2009 IEEE
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