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Erbium-doped fiber amplifier can be used as relay amplifier in optical fiber communication system to extend the transmission length of trunk network, as preamplifier, to amplify and input extremely small optical signal to optical receiver, so as to improve the flexibility of optical receiver, and also as post amplifier, to improve the emission power. It can be seen that erbium-doped fiber amplifier is used in optical fiber communication system It plays an important role in the unification. However, the existing EDFA has the problems of poor reliability and weak anti-interference ability. When the optical signal is disturbed by external factors, the output of EDFA is unstable, and even the stability of power supply and temperature control accuracy will be reduced.

Compared with the prior art, it has the following characteristics:

1. The input optical isolator is set at the input end, and the output optical isolator is set at the output end to prevent light reflection, reduce the noise when EDFA works, improve the reliability and stability of EDFA, and set the automatic gain control unit to realize the automatic gain control of EDFA, improve the reliability and anti-interference ability;

2. The automatic gain control unit includes an optical detector, a control module, a DA conversion module, a pump driver module, a pump laser, a temperature detection module and a refrigeration module, which realizes the control of the output power and the working temperature of the pump laser and further improves the reliability and anti-interference ability.

Technical parameters: Erbium-doped fiber amplifier can be used as relay amplifier in optical fiber communication system to extend the transmission length of trunk network, as preamplifier, to amplify and input extremely small optical signal to optical receiver, so as to improve the flexibility of optical receiver, and also as post amplifier, to improve the emission power. It can be seen that erbium-doped fiber amplifier is used in optical fiber communication system It plays an important role in the unification. However, the existing EDFA has the problems of poor reliability and weak anti-interference ability. When the optical signal is disturbed by external factors, the output of EDFA is unstable, and even the stability of power supply and temperature control accuracy will be reduced.

Compared with the prior art, it has the following characteristics:

1. The input optical isolator is set at the input end, and the output optical isolator is set at the output end to prevent light reflection, reduce the noise when EDFA works, improve the reliability and stability of EDFA, and set the automatic gain control unit to realize the automatic gain control of EDFA, improve the reliability and anti-interference ability;

2. The automatic gain control unit includes an optical detector, a control module, a DA conversion module, a pump driver module, a pump laser, a temperature detection module and a refrigeration module, which realizes the control of the output power and the working temperature of the pump laser and further improves the reliability and anti-interference ability.