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Experiments on 10-Gbaud polarization-division-multiplexed DQPSK, DBPSK and OOK show that time interleaving return-to-zero signals in two polarizations can significantly reduce nonlinear polarization scattering in polarization-division-multiplexed WDM systems and increase the system tolerance to inter-channel nonlinearities.
We propose a novel channel estimation method for polarization-division-multiplexed (PDM) OFDM that improves the signal tolerance to nonlinear cross-phase modulation in WDM transmission. The improvement is quantified numerically in a 112-Gb/s PDM-OFDM based WDM system.
We show numerically that the nonlinear tolerance of a 112-Gb/s polarization-division-multiplexed coherent optical OFDM signal in inline-dispersion-compensated transmission can be substantially improved by a joint self-phase-modulation compensation scheme, particularly when optimized dispersion maps are used.
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