Abstract
An advanced split-step method is employed for the digital backward-propagation (DBP) method using the coupled nonlinear Schrodinger equations for the compensation of inter-channel nonlinearities. Compared to the conventional DBP, cross-phase modulation (XPM) can be efficiently compensated by including the effect of the inter-channel walk-off in the nonlinear step of the split-step method (SSM). While self-phase modulation (SPM) compensation is inefficient in WDM systems, XPM compensation is able to increase the transmission reach by a factor of 2.5 for 16-QAM-modulated signals. The advanced SSM significantly relaxes the step size requirements resulting in a factor of 4 reduction in computational load.
Highlights
Recent trends in optical communication are focusing on high data-rates as well as spectrally efficient systems in order to cope with the demands for capacity growth
Three wavelength-division multiplexed (WDM) systems with 12, 24 and 36 channels spaced at 50 GHz have been simulated to evaluate the impact of the channel count on the post-compensation algorithm
XPM compensation increases the number of operations by a factor of 2, which comes from the extra FFT/IFFT operations required for the advanced split-step method (SSM)
Summary
Recent trends in optical communication are focusing on high data-rates as well as spectrally efficient systems in order to cope with the demands for capacity growth. Techniques capable of compensate the joint effect of chromatic dispersion (CD) and nonlinearity have contributed to approach the maximum achievable fiber capacity, which eventually becomes limited by only non-deterministic noise sources. Such comprehensive compensation of fiber impairments is based first, on the coherent detection of the optical signal [2] and second, on the implementation of digital backward propagation (DBP) by means of digital signal processing. Full impairment compensation of inter-channel effects via DPB requires high oversampling as well as short step sizes when solving the z -reversed nonlinear Schrodinger equation (NLSE). A rigorous analysis of the computational cost is carried out comparing the conventional and advanced split-step methods for XPM compensation
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