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分析了光纤光参量放大过程泵浦光与信号光的非线性相互作用，得到信号光增益G_s。进一步分析G_s，获得其增益带宽特性，只有在泵浦波长大于光纤零色散波长时才有增益，带宽约为50nm。
The nonlinear interaction between the pump light and the signal light in the optical parametric amplification process is analyzed to obtain the signal light gain G_s. Further analysis of G_s, to gain its gain bandwidth characteristics, only in the pump wavelength is greater than the optical zero-dispersion wavelength gain, the bandwidth is about 50nm.