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6 January 2015Adaptive Volterra equalizer for optical OFDM modem
This paper addresses OFDM (orthogonal frequency division multiplexing) transmission over optical links with high
spectral efficiency, i.e. by using high-order QAM-modulation schemes as a mapping method prior to the OFDM
multicarrier representation. Here we address especially coherent optical OFDM modem in long distance which is
affected by a nonlinear distortion caused by fiber nonlinearity as a major performance-limiting factor in advanced optical
communication systems. We proposed a nonlinear electrical equalization scheme based on the Volterra model.
Compared with other popular linear compensation technique such as the LMS (least Mean Square) and RLS (Recursive
Least square), simulation results are presented to demonstrate the capability of a Volterra model based electrical
equalizer used in a coherent optical orthogonal frequency division multiplexing system. It is shown that the Volterra
model based equalizer can significantly reduce nonlinear distortion.