Abstract
We propose and experimentally demonstrate an optical signal-to-noise ratio (OSNR) monitoring technique for an polarization-multiplexed return-to-zero differential phase-shift keying channel utilizing a narrowband optical filter and a low-speed detector. A maximum power increment of is measured at a radio frequency (rf) of for monitoring of OSNR up to , insensitive to chromatic dispersion of and polarization-mode dispersion (PMD) of .
© 2009 Optical Society of America
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