星地相干激光通信链路预算分析

Budget Analysis of Satellite-to-Ground Coherent Laser Communication Link

从星地相干激光通信链路预算方程出发，分析了通信系统各参量对激光链路的影响，从系统各单元的性能参数分配和优化出发，验证了5Gbps星地相干光通信实验的可行性。分析了相干外差探测中混频效率表达式。仿真结果表明，采用自适应光学能有效地提高相干混频效率。

Starting from the budget equation of satellite-to-ground coherent laser communication link, the effect of the each pa- rameters of communication system to laser link is analyzed, and starting from the performance parameters allocating and optimizing of the each units of the system, the feasibility of sateUite-to-ground coherent laser communication experiment in 5Gbps is verified. Fi- nally, the frequency mixing efficiency expression in Coherent heterodyne exploration is analyzed. The simulated results show that the coherent frequency mixing efficiency can be effectively improved by using adaptive optics.