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以带光前置放大器且采用MZI相干和直接检测方式的DPSK接收机为分析模型,从考虑线性附加噪声和非线性相位噪声入手,对噪声统计特性进行了数学分析,并推导出了概率密度函数和BER公式。结果表明:数值计算结果与已发表论文的试验结果较为吻合;非线性相位噪声会对系统性能造成严重影响;高斯近似法不能很好的分析此模型。
Taking the DPSK receiver with optical preamplifier and MZI coherence and direct detection method as the analysis model, the noise statistical characteristics are analyzed mathematically considering the linear additional noise and the nonlinear phase noise, and the probability density function And BER formula. The results show that the numerical results are in good agreement with the experimental results of published papers. The nonlinear phase noise will seriously affect the system performance. The Gaussian approximation method can not analyze the model well.