Abstract
A main drawback of Coherent Optical Orthogonal Frequency Division Multiplexing
(CO-OFDM) system is its sensitivity to fiber nonlinearity. Nonlinear electrical
equalizer based on Volterra model has been demonstrated capable of compensating fiber
nonlinear distortion in an OOK or PSK optical communication system. However, the
implementation complexity of a Volterra model based electrical equalizer prohibits its
deployment in a real-life CO-OFDM system. In this paper, we demonstrate that the number
of kernels of a Volterra model based equalizer can be significantly reduced using the
modified Gram-Schmidt method with reorthogonalization techniques. The resulting “sparse”
Volterra model based electrical equalizer and the electrical equalizer based on the
“full” Volterra model have comparable performance and can compensate intra-channel
nonlinearity of a 16-QAM 100 Gbit/s CO-OFDM System.
© 2010 IEEE
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