Abstract
We experimentally investigate digital intra-channel nonlinear impairment compensation and inter-channel crosstalk suppression for 4 × 160.8-Gb/s wavelength division multiplexing (WDM) polarization division multiplexing quadrature phase shift keying (PDM-QPSK) transmission over 1300-km single-mode fiber-28 (SMF-28) on a 50-GHz grid with the spectral efficiency of 3.21b/s/Hz, adopting simplified heterodyne coherent detection. By using nonlinear compensation based on DBP with crosstalk suppression based on post filter and maximum likelihood sequence estimation (PF&MLSE), the BER has been improved from 1.0 × 10(-3) to 3.5 × 10(-4) for 4 × 160.8Gb/s WDM PDM-QPSK with heterodyne detection after 1300km SMF-28 transmission.
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