基于训练序列的光OFDM相移估计与补偿方法

摘要

A new method to compensate phase offset for single side band direct detection orthogonal frequency division multiplexing (O-OFDM) system in the frequency domain is proposed. The rule of phase offset related with signal frequency in O-OFDM system is obtained by sending training sequence, analyzed the phase shift of O-OFDM system, and compensated phase shift for long distance transmission signal which effected by dispersion according to the rule. The simulation results show that the O-OFDM system can transmit over 4000km SSMF at 40 GB/s with the phase compensation scheme and verified that the O-OFDM has very good application prospects for ultra-long haul and the high-speed optical communications.%提出了单边带直接检测光正交频分复用(O-OFDM)传输系统的频域相位补偿方案.通过发送训练序列的方式,获取O-OFDM系统中信号的相位偏移随频率的变化规律,并依此对长距离传输色散影响的信号进行相位补偿.实现了单边带直接检测O-OFDM传输系统的频域相位补偿方案.仿真实验表明采用此方法40Gb/s信号在标准单模光纤中可传榆4000km以上,验证了此方法的可行性.因此在高速超长距离的光纤通信中,O-OFDM系统具有很好的应用前景.