Abstract
We investigate and experimentally demonstrate an optical signal-to-noise
ratio (OSNR) monitoring technique for polarization-division-multiplexed return-to-zero
ON–OFF keying (PDM-RZ-OOK) and differential-phase-shift-keying (PDM-RZ-DPSK)
signals. Both polarization tributaries of the PDM channel can be simultaneously
monitored based on cascaded four-wave mixing in a polarization-diversity nonlinear
loop mirror. The interchannel crosstalk induced by nonlinear polarization
scattering could be mitigated using the polarization diversity loop structure.
As OSNR varies between 5 and 20 dB, the output power of the monitor has a
dynamic range of 4.2 and 4.6 dB for the OOK and DPSK signals, respectively.
We also demonstrate that the performances of the monitor are the same for
both time-interleaved and synchronized PDM-RZ signals.
© 2012 IEEE
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