OFDM-PON中PAPR的联合抑制方法

摘要

在采用正交频分复用(OFDM)技术的光无源接入网(PON)中,由于所产生的光OFDM信号具有较高的峰值平均功率比(PAPR),从而会对器件提出较高的要求,同时在其高速传输过程中也易导致非线性效应.通过联合使用限幅和信号预失真的方法降低了OFDM-PON中信号PAPR的影响,使得50km单波长下行5Gb/s的OFDM-PON实验系统的光信噪比大约有4dB的提升.%In passive optical access network (PON) using orthogonal frequency division multiplexing (OFDM) technology,optical OFDM signal has a high peak to average power ratio (PAPR),so it has very high requirements for devices,and easily leads to nonlinear effects in the high-speed propagation.In this paper,the joint use of clipping and the signal pre-distortion reduces the influence of the PAPR, 4dB improvement of the optical SNR is obtained in the OFDM-PON experimental system,and 5Gb/s in downlink can be achieved using each wavelength in single mode fiber of 50km.