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从掺铒光纤放大器的能级速率方程和光传输方程出发，得到一个简单的表达式，可用来计算放大器的增益、噪声系数等。在放大器的非饱和范围内，计算结果和实验结果十分一致。
Based on the energy rate equation and optical transmission equation of Erbium-Doped Fiber Amplifier, a simple expression is obtained, which can be used to calculate the gain and noise figure of the amplifier. In the non-saturation range of the amplifier, the calculation results are in good agreement with the experimental results.