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本文对低泵浦功率下１４８０ｎｍ泵浦的掺饵光纤放大器的特性进行了数值分析，分别给出了正，反向泵浦下大信号（１ｍＷ）输入时掺饵光纤放大器的增益──泵浦功率和噪声指数──泵浦功率曲线，说明了低泵浦功率对掺铒功率对掺期铒光纤放大器特性的影响。
In this paper, the characteristics of a 1480 nm pumped fiber amplifier under low pump power are numerically analyzed. The gain of the erbium-doped fiber amplifier at the input of large signal (1 mW) under positive and negative pumping are given respectively. The power and noise figure, the pump power curve, illustrates the effect of low pump power on the erbium-doped fiber amplifier characteristics.