提出了一种利用光纤环形器实现收发同光路的大气激光通信系统, 有利于实现系统的光路简化及模块化。该系统采用无信标光, 利用信号光进行对准和通信; 根据通信距离不同采用调焦结构调节光束发散角。设计了一种利用外部套筒螺旋进行调焦的机构, 相较于传统的调焦机构, 该调焦机构具有结构简单、尺寸小等优点, 利用搭建的大气激光通信系统进行了实验, 取得了较好的效果, 1.5km左右时系统的通信速率为1.25Gb/s。

An atmospheric laser communication system was realized by using optical fiber circulator, which is beneficial to realize the optical path simplification and modularization of the system. The system uses no beacon light, but signal light to realize alignment and communication. According to different communication distances, the focusing structure was adopted to adjust the beam divergence angle. A focus mechanism using spiral outer sleeve was proposed, and compared with traditional focusing mechanism, it presents the advantages of simple structure, small size, etc. Experiments were carried out by using the atmospheric laser communication system, and a communication rate of 1.25Gb/s at 1.5km distance was achieved.