Abstract
We analytically study optical signal-to-noise ratio (OSNR) monitoring
using polarization diversity and digital signal processing (DSP) in the
presence of first-order polarization-mode dispersion (PMD). We derived
conditions on the input signal polarization, principle states of
polarization (PSP) and differential group delay (DGD) of the fiber,
polarization beam splitter (PBS) axes and receiver electrical low-pass
filter bandwidth such that the monitored OSNR is least affected by PMD and
we propose the use of a polarization scrambler (PS) before the PBS to
achieve such conditions in practice. In addition, two special polarization
states for which the proposed technique can operate independent of
first-order PMD are identified. The theoretical predictions are verified
through simulations. The analytical insights developed represent a more
general and unified framework of which various OSNR monitoring techniques
based on polarization diversity proposed in the literature can be understood
as special cases.
© 2010 IEEE
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