Experimental Investigation of Four-Wave Mixing Impacts on 112-Gb/s PDM-QPSK WDM Transmission over Dispersion-Shifted Fiber

In this paper, we investigate the nonlinear impacts of Four-Wave Mixing (FWM) in a 112-Gb/s PDM-QPSK (polarization-division-multiplexed quadrature phase-shift-keying), 20-channel WDM system, with 200-GHz channel spacing, over DSF links. FWM degrading effects are investigated over 95 km DSF span for different launch power scenarios. A maximum in-band crosstalk of 10 dB is obtained at the zero-dispersion wavelength for a per-channel launch power of 3 dBm. Transmission penalties of 1.4 and 2.6 dB are obtained for per-channel launch powers of 0 and 2 dBm, respectively. In order to reach a WDM design with negligible transmission penalties over DSF, launch power had to be decreased by 8 dB in comparison with standard single-mode fiber (SSMF) transmission links.

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