The effects of fiber nonlinearity in Coherent Optical Orthogonal Frequency-Division Multiplexing (CO-OFDM)
transmission, such as self-phase modulation (SPM) and cross-phase modulation (XPM), are a major concern. In this
paper, we investigate the use of RF-Pilot (RFP) based nonlinearity compensation scheme in frequency domain to
compensate for fiber nonlinearity in a coherent OFDM optical system. It shows that the RFP-based compensation
scheme has superiority over a conventional pilot-based compensation scheme at FEC threshold.