Mitigation of nonlinear effects using uniform power transmission in coherent OOFDM systems

We investigate the high peak power resulting from the transmission of orthogonal frequency division multiplexing (OFDM) signals through optical fiber. High peak-to-average power ratio (PAPR) which is a major drawback of OFDM can make worse the nonlinearities experienced in optical fibers. Phase modulation instead of intensity modulation is adopted to keep the amplitude of optical power within the fiber uniform. To effectively combat the high peak power that results from the addition of number of subcarriers of OFDM in time domain, we apply Reduced Complexity Max Norm (RCMN) technique which is a distortion less PAPR reduction scheme. The proposed technique offers 3.7dB reduction in PAPR.