Non linearity equalization for coherent optical OFDM modem

Abstract

We propose a Linear adaptive channel equalization using the recursive least-squares (RLS) algorithm for coherent optical OFDM system. The proposed equalization method adaptively compensates the channel non linearities. Simulations for the proposed adaptive equalizer are conducted using a training sequence method to determine optimal performance through a comparative analysis. When compared to the un-equalized signals results show an improvement when using the Adaptive Equalization (AE). Moreover, it is shown that AE using RLS algorithm showed to be significantly beneficial for coherent optical OFDM systems. The performances of all different schemes were compared with respect to bit error rate, transmission distance, optical signal to noise ratio, power launch and error vector magnitude.