研究了相位共轭信号在长距离无中继传输系统中的抗非线性效应的性能。通过构建相应的仿真系统, 对比分析了单偏振信号与相位共轭信号的性能差异。仿真结果表明, 对于无中继传输系统, 相位共轭信号的色散预补偿与有中继传输系统有所差别。在传输信号为32-GBaud的QPSK、传输距离为330km以及后向泵浦设置为0.8W的情况下, 当前向泵浦为0.4, 0.6以及0.8W时, 相较于单偏振传输信号, 相位共轭信号的BER性能均可提高2dB以上。此外, 相对于单偏振信号, 相位共轭信号的传输距离约提升10%。

In order to mitigate the problem of strong nonlinear effect in the long-distance unrepeatered transmission system, the performance of phase conjugated signals was studied. The performance difference between single polarization and phase conjugated system was analyzed by simulations. Simulation results show that the dispersion pre-compensation of the phase conjugate signals is different from that of the relay transmission system. Compared with the single polarization signal, when the transmission distance is 330km and the backward pump is set to be 0.8W, the BER performance of the conjugated signal can be improved by more than 2dB for 32-GBaud QPSK when the forward pump is 0.4, 0.6 and 0.8W, respectively. Meanwhile, the transmission distance of the phase conjugated signal is increased by about 10%.