Abstract
The performance of degree of polarization (DOP) is investigated as a
control signal in polarization-mode dispersion (PMD) compensation systems
aided by polarization scrambling. The relation between the input and output
polarization states of a signal propagating through a polarization scrambler
and a PMD-induced optical fiber is described by a 3 x 3 Stokes transfer matrix. The average DOP
of the output signal over a period of polarization scrambling is derived as
an alternative to the conventional DOP-based control signal, i.e., minimum
DOP. In the presence of first- and all-order PMDs, the performance of the
average and minimum DOPs in monitoring of differential group delay (DGD) for
different data formats (i.e., RZ and NRZ) is evaluated. The performance of
the two control signals are further investigated by calculating the outage
probability of a feedforward first-order PMD compensation system. The results
show that the average DOP outperforms the minimum DOP and also gives a wider
DGD monitoring range.
© 2008 IEEE
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