基于偏振调制的相干FSO系统仿真

Simulation of coherent FSO system based on polarization modulation

为了给偏振调制自由空间光通信(FSO)系统的接收方式提供理论依据,建立了基于偏振调制的相干检测FSO系统模型,在Optisystem软件平台下完成系统的搭建,仿真分析了雾、霾和雪等大气天气下衰减系数和通信距离对系统通信性能的影响以及相位偏移对相干接收系统性能的影响,对零差相干检测、外差相干检测和直接检测3种检测方式进行了比较。仿真结果表明:基于偏振调制的相干检测方式有效地抑制了恶劣天气的干扰,提高了系统通信性能。

In order to provide theoretical basis for receiving mode of polarization modulated free space optical（FSO） communication system, coherent detection FSO system model based on polarization modulation is established, and the system simulation has completed under the Optisystem software platform that the new optical software. The influence of attenuation coefficient and communication distance on system communica- tion performance in fog, haze, snow and other atmospheric weather, and the effect of phase shift on the perfor- mance of coherent receiving system are simulated and analyzed. The performance of the FSO system using heterodyne coherent detection polarization modulation under the same weather conditions and the communi- cation performance with the direct detection system are compared. The simulation results show that the het- erodyne coherent detection method based on polarization modulation can effectively suppress the adverse weather interference and improve the communication performance of the system.