Abstract
Intrachannel nonlinearity is considered a major distortion in
high-capacity transmission systems particular for the case without inline
optical chromatic dispersion compensation. In this paper, a low-complexity
intrachannel nonlinear compensator operating at the symbol rate is proposed
based on the nonlinear perturbation predistortion for the dual-polarization
quadrature phase-shift keying (DP-QPSK) systems. Compared with the widely
studied backpropagation algorithm, the proposed algorithm achieves
comparable performance with significantly reduced complexity and halved
sampling speed in digital signal processing and digital-to-analog
converters. The proposed algorithm is demonstrated in a 43 Gb/s DP-QPSK
transmission experiment over 1500 km. In addition to the experimental
demonstration, numerical simulation verifies that the proposed algorithm is
quite robust by tolerating significant uncertainties of link parameters and
span-by-span inhomogeneity in the links.
© 2011 IEEE
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