This paper studies the change of bit error rate after 1600km transmission of DP-16QAM modulation signal when DBP,OBP and their combinations are applied.It put forward two ways to combine OBP with DBP:OBP combined with DBP which having different calculation stepsize and OBP combined with DBP which having different backward propagation distance.Simulation results show that the way OBP combined with DBP which having different backward propagation distance can improve the performance of the system significantly.%对比分析了单独使用数字反向传输(DBP)补偿、单独使用光反向传输(OBP)补偿以及两者联合补偿时,DP-16QAM调制信号在传输1600km后误码率的变化情况.提出了OBP与DBP的两种结合方式:OBP与不同计算步长或不同反向传输距离的DBP结合.通过仿真对比实验证明,OBP与不同反向传输距离DBP的结合方式对系统的改善较为明显.
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