Abstract
We present an analytical description and experimental demonstration
of inter-polarization crosstalk caused by second-order polarization-mode dispersion
(PMD). Even if the first-order PMD is completely compensated for, second-order
PMD leads to large transmission impairments in ultrashort optical pulse transmissions
through signal depolarization, which is caused by the frequency dependence
of the principal state of polarization. In particular, depolarization in a
polarization-multiplexed transmission inevitably prevents the complete separation
of the two channels at the polarization demultiplexing. The analytical results
show that the crosstalk increases in proportion to the fourth power of the
signal bandwidth and grows by the square of distance as also verified by the
experiments.
© 2012 IEEE
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