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在40 Gbit/s相干偏振复用正交相移键控(QPSK)传输系统中,为了补偿由于光纤中非线性效应引起的传输信号损伤,采用了基于Manakov方程的反向传播非线性补偿算法.传统的基于标量非线性薛定谔方程(NLSE)的反向传播算法忽略了偏振模色散(PMD)的作用,因此在偏振复用系统中不能补偿由于PMD引起的信号损伤;而基于Manakov方程的数字信号处理方法能够对PMD与克尔非线性效应的耦合作用进行补偿.从仿真与实验两个方面对此方法在40 Gbit/s相干偏振复用QPSK传输系统中的补偿效果进行了验证.结果均表明,与NLSE相比,基于Manakov方程的反向传播算法在400 km长距离QPSK传输中显示出更好的性能.在光信噪比(OSNR)为18 dB时,基于Manakov方程的反向传播算法得到的Q值与NLSE相比提高约3dB.
In the 40 Gbit / s coherent Polarization Quadrature Phase Shift Keying (QPSK) transmission system, a Manakov equation-based backpropagation nonlinear compensation algorithm is used to compensate for the transmission signal impairments due to the non-linear effects in the fiber. The traditional backpropagation algorithm based on the scalar nonlinear Schrödinger equation (NLSE) ignores the effect of PMD and can not compensate the signal damage caused by PMD in the polarization multiplexing system. The digital signal based on the Manakov equation The processing method can compensate the coupling effect of PMD and Kerr nonlinearity, and the compensation effect of this method in QPSK transmission system with 40 Gbit / s coherent polarization is verified from two aspects of simulation and experiment.The results show that , The backpropagation algorithm based on the Manakov equation shows better performance in the 400 km long-distance QPSK transmission than the NLSE.When the OSNR is 18 dB, the back propagation algorithm based on the Manakov equation The resulting Q value improves about 3 dB compared to NLSE.