Space Radiation Effect On The Performance Of Small Signal Light Power Amplifier

Satellite optical communication is an important branch in satellite communication. But because of the long transmission distance and amplifying, there is enormous signal loss after transmission, resulting in information deterioration. Thus, optical preamplifier is needed to amplify the signal with low noise to ensure the accuracy and stability of the information. This means that optical preamplifier is a necessary part in satellite communication system.CW Erbrium Fiber Amplifier is one of the important application. It is applied in the receiver end of the system, and it has the advantages like adapting transmission distance, good noise characters, easy-coupling of light and fiber, no light polarization, and good stability. However, in space environment, extreme environment in space like radiation can lead to performance degradation, as a result, the sensibility of the receiver is seriously damaged. Therefore, the effect of spatial radiation on the performance of the optical power amplifier has become an urgent research problem.This paper studies the effect of spatial radiation to the performance of CEFA, the major contents are as follows:First, the application of continuous doped fiber amplifier bait is discussed. The satellite optical communication and its research status is fully covered. Many kinds of optical power amplifier are mentioned to briefly analyze the selection of power amplifier in satellite optical communication system. The simplified three power stages model is used to study its functional principle and gain features.Second, spatial radiation is analyzed by radiation model. The spatial radiation to the performance of different parts of the system is studied, the equation of speed and power transmission is developed to get the performance change under spatial radiation.Finally, experiments are conducted to verify the model. The relationship of gain(G), signal noise ration(SNR), Noise Factor(NF), Bit Error Rate(BER) and radiation amount is obtained. Also, the performance effect of different wave length under the same radiation amount is studied and verified.