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相位噪声是相位调制格式(PSK)光通信系统的主要信号损伤来源之一。简要介绍了线性相位噪声及非线性相位噪声的主要来源;通过理论推导分别得到了由多个级联放大器的自发辐射(ASE)噪声导致的线性相位噪声的概率密度函数(PDF)以及由于克尔效应导致的非线性相位噪声的PDF;用Matlab编程软件进行多次数值统计得到了线性相位噪声、非线性相位噪声以及光纤传输系统中总的相位噪声的概率分布,并与理论结果及高斯分布模型进行了比较。结果表明,当入射信号光功率较低时,链路中线性相位噪声占优势,高斯分布模型能较准确地反映实际链路中的相位噪声分布;而当入射信号光功率较大时,链路中非线性相位噪声将占优势,采用高斯分布模型不再准确。
Phase noise is one of the primary sources of signal impairments in phase modulation format (PSK) optical communication systems. The main sources of linear phase noise and non-linear phase noise are briefly introduced. The probability density function (PDF) of linear phase noise caused by spontaneous emission (ASE) noise of multiple cascaded amplifiers is deduced theoretically. Effect caused by the nonlinear phase noise of the PDF; using Matlab programming software for multiple numerical statistics obtained linear phase noise, nonlinear phase noise and optical fiber transmission system, the total phase noise probability distribution, and the theoretical results and Gaussian distribution model Compared. The results show that when the optical power of incident signal is low, the linear phase noise is predominant in the link, and the Gaussian distribution model can accurately reflect the phase noise distribution in the actual link. When the optical power of incident signal is large, China-Africa linear phase noise will be dominant, and the Gaussian distribution model will no longer be accurate.