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随着通信容量的增大,密集波分复用(DWDM)光纤通信系统中的受激喇曼散射(SRS)非线性效应成为影响系统质量的重要因素。采用时域分步法模型,对色散下的SRS统计特性进行了深入研究,得到了在整码元色散走离时,DWDM系统各信道传输功率的统计特性,推导了各信道传输功率的数学期望、标准差,证实了各信道传输功率符合高斯分布,计算了概率密度函数,并且与仿真数据取得了较好的一致。
With the increase of communication capacity, the stimulated Raman scattering (SRS) nonlinear effect in Dense Wavelength Division Multiplexing (DWDM) optical fiber communication system becomes an important factor affecting system quality. The time-domain method is used to study the statistical properties of SRS under dispersion. The statistical properties of the transmission power of each channel in DWDM system are obtained when the chromatic dispersion of the whole symbol is separated. The mathematical expectation of transmission power of each channel is deduced , Standard deviation, confirmed that the channel transmission power in line with Gaussian distribution, calculated the probability density function, and the simulation data obtained a good agreement.