Abstract
We study the efficiency and numerical accuracy of two digital backpropagation
schemes for post-compensating SOA-induced nonlinear impairments in the context
of coherent receivers for advanced modulated formats. While the classical
Runge–Kutta numerical techniques provide almost ideal post-compensation
when the receiver sampling time tends to zero, this accuracy diminishes quickly
as we approach realistic sampling times. At rates near Nyquist, despite much
reduced complexity, our proposed digital filter back propagation technique
outperforms Runge–Kutta techniques in terms of root mean square (rms)
residual distortion. We quantify rms residual distortion for both methods
as sampling time varies. We also examine bit error performance for 16-QAM,
as well as the impact of SOA saturation level. We examine robustness to imperfect
channel estimation.
© 2011 IEEE
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