由于大气衰减的影响，非视线散射大气光通信需要使用光学天线以提高对光信号的采集能力，进而增加通信距离。针对非视线大气光通信的需求，利用ZEMAX软件对半球透镜、复合抛物面聚光器(CPC)和卡塞格伦望远镜等光学天线进行了性能分析。分析表明：半球透镜和CPC视场较大，增益值高。利用蒙特卡罗法模拟计算了一定条件下，非视线散射光通信在有无半球透镜或CPC作光学天线时到达探测元件的能量随通信距离的变化。结果表明：CPC聚光能力更强，适合作为非视线散射光通信的光学天线。

To overcome the atmospheric attenuation effect,the non-line-of-sight scattering atmospheric optical communication system usually adopt an optical antenna to enhance the signal collection ability and increase its communication distance. Some conventional optical antennas like hemispherical lens,compound parabolic concentrator (CPC),Cassegrain telescope were analyzed with the software of ZEMAX. The results show that the field of view (FOV) of hemispherical lens and CPC are wider and its gain is higher compared with other optical antennas. The variation of the photons' energy intensity distribution with the communication distance was calculated with Monte Carlo method,with CPC and hemispherical lens as the optical antennas. The result shows that the light collection capacity of CPC optical antenna is better than hemispherical lens optical antenna,and CPC is the more suitable optical antenna for non-line-of-sight scattering atmospheric optical communication.