说明：  通信XPM信道，脉冲相位分析。通常描述脉冲相位的方法有时域，频域，和整体，本代码为整体描述XPM脉冲信号相位,同时包含XPM反向传输算法。
(XPM communication channel, pulse phase analysis. The method is usually described pulse phase sometimes domain, frequency domain, and overall, the code for the overall description XPM pulse signal phase)