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考虑到DWDM系统中的比特序列的随机性、信道间脉冲走离效应等因素的影响。给出了调制格式为FSK,信道为非简并,入射脉冲为啁啾高斯脉冲波情况下的四波混频噪声标准差的理论计算模型,在考虑到多个信道对于探测信道的影响的情况下用实例对其进行分析。研究结果表明在讨论调制偏移频率与四波混频噪声标准差的关系中我们发现调制偏移频率是有最优取值的,特征宽度值的大小基本不会影响到最优取值的选取,但是较小的特征宽度值可以得到比较小的四波混频效应,然而群速度色散值的大小对于调制偏移频率与四波混频标准差的关系曲线图的影响较大,其绝对值在很小的情况下,调制偏移频率与四波混频标准差曲线图基本呈线性增长趋势,随着其绝对值的增大,曲线出现了起伏变化。
Considering the randomness of bit sequence in DWDM system and the influence of pulse walk-off effect among channels, The theoretical calculation model of four-wave mixing noise with modulation format FSK, non-degenerate channel and chirped Gaussian pulse with incident pulse is given. Considering the influence of multiple channels on the sounding channel Under the example of its analysis. The results show that in discussing the relationship between the modulation offset frequency and the standard deviation of the four-wave mixing noise, we find that the modulation offset frequency has an optimal value, and the size of the feature width does not substantially affect the selection of the optimal value , But the smaller characteristic width value can obtain a relatively small four-wave mixing effect. However, the magnitude of the group velocity dispersion value has a great influence on the relation curve between the modulation offset frequency and the four-wave mixing standard deviation. The absolute value In a very small case, the standard deviation of the modulation offset frequency and the four-wave mixing standard curve shows a linear increase trend. As its absolute value increases, the curve fluctuates.