nenf

The equivalent noise normalized by the fiber nonlinearity ( NENF ) is derived for bi directionally pumped and distributed fiber Raman amplifiers ( BiDFRA ) assuming low signal strengths . Amplified spontaneous emission noise and double Rayleigh scattering noise are both included .

在小信号假设下推导出了双向泵浦分布光纤Raman放大器（BiDFRA）中包括放大的自发辐射噪声和二次Rayleigh散射噪声在内的等效噪声系数公式，并对光纤非线性进行了归一化。