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Coherent optical communication detection device based on modified balanced optical phase-locked loop
In this paper, we first give the basic theory of the in-orbit test. Then designed the laser simulation and test station, which consists of laser transmitter module, laser receiver module, and general test module. In the GEO-to-LEO laser communication terminal test progress, the laser simulation and test station responsible for the simulation of the LEO laser communication terminal. In the LEO-GEO-Ground laser link performance test progress, the laser simulation and test station simulate the LEO satellite, which transfer high date rate data flow to GEO satellite, then the GEO satellite route the data flow to the GEO-to-Ground laser communication terminal through optical router, finally GEO satellite transfer the LEO data down to fixed laser receiver on ground.
To mitigate the influence of the atmosphere turbulence, we proposed a new method base orthogonal phase modulation with self homodyne detect. This method can not only mitigate the influence of the turbulence, but also adjust the communication date rate steplessly. The experiment results show that the method is very suitable to the satellite-to-ground link.
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