光外差检测能提高无线激光通信系统的光电检测灵敏度, 可以增大通信距离, 并且能够采用多种调制方式。提出了一种基于副载波调制的无线光外差检测系统, 重点对大气信道对外差系统的影响因素进行了分析。着重研究了偏振状态和波前修正联合控制、载波恢复、同态滤波等关键技术, 以克服大气散射和大气湍流对外差检测系统的影响。最后介绍了无线光外差检测的实验系统, 为无线激光通信外差检测技术提供理论依据和实验基础。

The optical heterodyne detection, which has a variety of modulation modes, is capable to amplify the photoelectric detection sensitivity and to increase the communication distance of free space optical communication system. Due to these advantages, a heterodyne detection system is proposed based on subcarrier modulation. This system emphasizes on analyzing the influences of atmospheric channel on optical heterodyne system. In order to overcome the influence of atmosphere scatters and atmospheric turbulence, primarily researches are carried out on the key techniques of the joint control of polarization and wavefront, carrier recovery and homomorphic filter. The experimental system for optical heterodyne is introduced, providing the theory basis and the experiment basis for optical heterodyne detection technology.