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通过引入描述扰动程度的参数Ｘ和描述掺饵光纤放大器（ＥＤＦＡ）饱和特性陡度的参数Ｔ，本文推出了一个归一化的ＥＤＦＡ增益表达式，并据此对系统受扰后的信号恢复特性和误码率变化进行了分析。结果表明：对ＥＤＦＡ饱和程度较浅的陆上光纤通信系统，出现小于１ｄＢ（Ｘ≥０．８）的微扰时，光功率经一级ＥＤＦＡ即可恢复其原值的９０％；系统经３ｄＢ扰动（Ｘ＝０．５）后，光功率（信号和噪音功率之和）经过三级ＥＤＦＡ方能恢复到原值的９０％，但系统误码率（ＢＥＲ）的恶化则在两个量级以上，且随着扰动开始点的后移而更加恶化。这说明为保证系统受扰后能正常工作，其光信噪比应有相当大的裕量。ＥＤＦＡ饱和越浅，系统受扰动的影响就越严重。
By introducing a parameter X describing the degree of disturbance and a parameter T describing the steepness of the saturation characteristic of the erbium doped fiber amplifier (EDFA), a normalized EDFA gain expression is introduced and the signal recovery characteristics And bit error rate changes were analyzed. The results show that when the optical fiber communication system with shallow saturation in EDFA is less than 1dB (X≥0.8), the optical power can be restored to 90% of its original value by EDFA. When the system passes 3dB After disturbance (X = 0.5), the optical power (the sum of the signal and noise power) can be restored to 90% of the original value through the three-stage EDFA, but the deterioration of the system BER (bit error rate) Or more, and worsen as the disturbance starts. This shows that in order to ensure the normal operation of the system after the disturbance, the optical signal to noise ratio should have a considerable margin. The shallower the EDFA saturation, the more severe the disturbance of the system.