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通过合理分析提出了便于计算多波长双向抽运光纤拉曼放大器信号及噪声功率的实用数值模型,给出求解信号和噪声功率的快速算法。在定义抽运方向度为前向抽运功率与总抽运功率值的比值后,通过对计算结果的分析发现信道平均放大自发辐射噪声功率随着抽运方向度的提高而单调递减;而信道平均双重瑞利散射噪声功率相对抽运方向度的变化曲线始终成U字形。不同的增益下存在对应的最优抽运方向度,在此抽运方向度下放大器总噪声最低。进而考虑在信号非线性失真的条件下提出了抽运方向度优化的衡量指标。优化后的多波长双向抽运方式不仅能保证对所有信道的平坦放大,而且其综合性能明显高于后向抽运方式。
Through the reasonable analysis, a practical numerical model for calculating the signal and noise power of the multi-wavelength bi-directional pumping fiber Raman amplifier is proposed and a fast algorithm for solving the signal and noise power is proposed. After the ratio of the pumping power to the total pumping power is defined, the analysis of the calculation results shows that the average power of the spontaneous emission radiated by the channel decreases monotonically with the increase of the pumping direction, while the channel The curve of the average double Rayleigh scattering noise power relative to the pumping direction is always U-shaped. At different gains there is a corresponding optimal direction of pumping, at which the total amplifier noise is the lowest. Then we consider the measure of the optimization of pumping direction under the condition of signal nonlinear distortion. The optimized multi-wavelength bi-directional pumping method not only ensures the flat amplification of all the channels, but also has a higher overall performance than the backward pumping method.