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We experimentally investigate the excess noise induced on a CV-QKD system in a WDM environment consisting of 4×100 Gb/s PDM-QPSK and 16×10 Gb/s OOK classical telecom signals. The influence of the receiver's noise, the Raman scattering and the four-wave mixing process are evaluated.
We split each stage of back-propagation into a linear and a nonlinear part in parallel. We show by simulation and experiment that negligible performance degradation is achieved with half implementation complexity by baud-rate nonlinear compensation.
We demonstrate the use of polarization alternation to dramatically improve performance in 42.7-Gb/s WDM transmission. Six channels are transmitted through ten 200-km (39-dB loss) standard-single-mode-fiber spans with amplification provided solely by erbium-doped fiber amplifiers.
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