Abstract
A polarization-mode dispersion (PMD) monitoring technique
tailored for polarization-multiplexed high capacity optical transmission
systems is proposed and experimentally demonstrated. First-order PMD is
evaluated calculating the vector product of the spectral components of the
two state-of-polarization transmitted in the polarization-multiplexed
system. The spectral components in each state-of-polarization are resolved
by a real-time optical Fourier transformer. The technique is demonstrated
measuring first-order PMD in an proof-of-concept experiment implementing an
alternate-polarization return-to-zero modulation. The results indicate an
improved accuracy over the conventional Poincaré-arc measurement
method applied to a single polarization. Successful differential group-delay
(DGD) measurements have been performed from 0.68 to 30.78 ps with 2.5%
maximum relative error. A high degree of independence with the SOP/PSP angle
is observed. The technique can be used to generate a feedback signal for PMD
compensators in generic polarization-multiplexed transmission
systems.
© 2009 IEEE
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