An adaptive compensation scheme-based coded direct detection optical–orthogonal frequency division multiplex (OFDM) system

A major concern in the use of optical-OFDM systems is their limited dynamic range due to nonlinear distortion (NLD) and high peak to average power ratio (PAPR). In this paper, an adaptive filter–based compensation scheme is proposed for a coded direct detected-optical-OFDM system. Moreover, different turbo code rates (DTCRs) are applied for the subcarriers of different regions. For subcarriers in low and high frequency regions a lower rate turbo codes are used. On the other hand for remaining subcarriers a higher rate turbo codes are preferred. This kind of system helps to provide high receiver sensitivity and improved Bit error rate (BER) by more than 2 dB.

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► An adaptive filter based dispersion compensation for optical-OFDM system is presented.
► Nonlinear distortion and peak to average power ratio (PAPR) are analyzed.
► Different turbo code rates (DTCRs) are applied.
► High receiver sensitivity and improved Bit error rate by more than 2 dB is observed.