光纤通信中有色散影响的受激喇曼散射信道特性研究

提出了在波分复用光纤通信系统中，考虑光纤色散“走离”时受激喇曼散射(SRS)信道的新模型,给出了计算中距离步长的选取公式。根据该模型，数值计算了各信道在随机数字序列调制下和在受激喇曼散射(SRS)非线性效应作用下经过有色散“走离”的波分复用光纤系统的传输功率。得出光纤色散会降低SRS效应引起的输出功率波动的结论,画出了在SRS效应作用下输出功率标准差随色散系数变化的曲线，并对产生该现象的机理进行了定性分析。该模型适合于任意光纤色散、任意输入功率和任意信道数目。

Channel characteristics of stimulated Raman scattering with dispersion effect in optical fiber communication system

A new model that accounts for the effects of dispersion on stimulated Raman scattering cross-talk in wavelength division multiplexed systems with random initial binary data is proposed.The formula for calculating the middle distance step is given.According to the model,the output power from each communication channel,which passes through the wavelength division multiplexed fiber system that has dispersion "walk-off" under the random digital sequence modulation and the function of non-linear effects,was numerically calculated.The conclusion that fiber dispersion may reduce the output power fluctuation caused by SRS effect was obtained.The results show that the deviation of output power is significantly reduced in the presence of dispersion.The change of the standard deviation of system output power with the dispersion coefficient under the SRS effect is plotted.The mechanism causing the phenomenon was quantitatively analyzed.The model works with any fiber dispersion,input power and number of channels.