光学学报, 2010, 30 (12): 3408, 网络出版: 2010-12-07
光相位调制传输系统中相位噪声的概率分布特性
Probability Density of Phase Noise in Optical Phase-Modulated Transmission Systems
光纤通信 相位噪声 概率分布密度 自发辐射噪声 克尔效应 optical fiber communication phase noise probability density spontaneous emission noise Kerr effect
摘要
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。
Abstract
Phase noise is considered as one of the main sources of signal impairments in optical phase-shift-keying (PSK) systems. The main sources of linear phase noise and nonlinear phase noise are introduced. The linear phase noises arise from amplified spontaneous emission (ASE) of each in-line amplifier and the nonlinear phase noises are induced by the fiber Kerr effect. The probability density functions (PDF) of linear phase noise and nonlinear phase noise are obtained respectively by theoretical analysis. The probability distribution of linear phase noise, nonlinear phase noise and total phase noise in fiber links are also obtained by statistical simulation, and are compared with Gaussian distribution. The results show that the Gaussian model can reflect noise distribution in practical fiber links when input signal power is low, while failed to accurately characterize systems when the nonlinear contribution to phase noise becomes dominant.
席丽霞, 王少康, 张晓光. 光相位调制传输系统中相位噪声的概率分布特性[J]. 光学学报, 2010, 30(12): 3408. Xi Lixia, WangShaokang, Zhang Xiaoguang. Probability Density of Phase Noise in Optical Phase-Modulated Transmission Systems[J]. Acta Optica Sinica, 2010, 30(12): 3408.