反向传输(BP)算法是实现高速光纤系统非线性补偿的一种常用且有效的方法，在此算法基础上加入高斯滤波器，可进一步提高接收系统性能,同时大大降低计算复杂度。然而高斯滤波器是一种理想化滤波器，其设计实现难度大且结构复杂。提出一种基于窗函数有限脉冲响应(FIR)滤波器和BP算法结合实现非线性补偿的方案，详细分析了滤波器的参数选取对补偿性能的影响，并在224 Gb/s双偏振16进制正交幅度调制(DP-16QAM)640 km无色散补偿光纤传输系统中比较了不同补偿方案的补偿效果。结果表明，汉宁窗FIR滤波器的频域特性类似于高斯函数，利用9个抽头就能够有效补偿非线性损伤，提高系统性能。与线性补偿算法相比，FIR-BP算法能够将误码率(BER)降至10-3以下，将最佳入纤功率提高至少3 dB。

Back propagation (BP) algorithm is a common effective method for nonlinear compensation in high-speed fiber optic system. System performance can be improved a lot while the computational complexity can be reduced in the same time if a Gaussian filter is added to BP. However, the Gaussian filter is an ideal filter and it′s hard to be designed with its complex structure. The scheme that the window finite impulse response (FIR) filter is combined with BP algorithm is proposed. The compensation performance influenced by the filter parameters selection is analyzed in detail, and the performances of different schemes in the 640 km non-dispersion compensation fiber transmission system with 224 Gb/s dual-polarization 16 quadrature amplitude modulation (DP-16QAM) signal are compared. The results prove that the frequency domain characteristics of Hanning FIR filter are similar to the Gaussian function, which can compensate the nonlinear damage and improve the system performance effectively with only 9 taps. Results of the experimental system show that the proposed FIR-BP algorithm can reduce the bit error rate (BER) to 10-3 or less and can increase the optimum fiber input power at least 3 dB compared to the linear compensation algorithms.