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Simultaneous OSNR Monitoring for Two Polarization Tributaries of a PDM Signal Using a Polarization-Diversity Nonlinear Loop Mirror Based on FWM

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5 Author(s)
Zhiyu Chen ; Sch. of Inf. Sci. & Technol., Southwest Jiaotong Univ., Chengdu, China ; Lianshan Yan ; Anlin Yi ; Wei Pan
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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.

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Lightwave Technology, Journal of  (Volume:30 ,  Issue: 14 )