Abstract
To provide higher capacity networks, 40-Gb/s transmission systems are
under active development and their cost is on the way to be competitive with
the one of 4 x 10
Gb/s. However, their lower tolerance to linear and nonlinear fiber impairments
remains a major drawback for field deployment. To address the issue of linear
impairments, coherent detection of multilevel formats with polarization division
multiplexing appears as a promising solution by reducing the symbol rate to
10 Gbaud. Indeed, such coherent based systems have already demonstrated an
improved tolerance to optical noise and an interesting capability to compensate
for large amount of chromatic dispersion. In this paper, the tolerances to
narrow optical filtering, chromatic dispersion, and polarization mode dispersion
are investigated with coherent detection of 10-Gbaud quadrature phase shift
keying (QPSK) with and without polarization division multiplexing. Moreover,
the efficient mitigation of these linear impairments by digital processing
in a coherent receiver is demonstrated in an ultralong haul transmission (4080
km) of 40-Gb/s QPSK polarization multiplexed data.
© 2007 IEEE
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