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搭建了一套37单元的自适应光学系统和155M/2.5G大气激光通信系统室内实验平台。结果显示:大气湍流对激光通信性能影响很大。使用芯径为62.5μm的多模接收光纤时,自适应开闭环误码率最大改善超过4个数量级;使用芯径为10μm的单模接收光纤时,可以很明显地观测到接收端信号的深度衰落现象,且衰落程度与误码率一一对应。自适应光学闭环后,深度衰落得到了抑制,也极大地降低了系统误码率。
Set up a 37-unit adaptive optics and 155M / 2.5G atmosphere laser communication system indoor experimental platform. The results show that atmospheric turbulence has a great influence on the laser communication performance. When using a multimode receiving fiber with a core diameter of 62.5μm, the error rate of the adaptive closed-loop loop can be improved by more than 4 orders of magnitude. When using a single-mode receiving fiber with a core diameter of 10μm, the depth of the signal at the receiving end can be obviously observed Fading phenomenon, and the degree of decline and error rate one by one correspondence. After closed-loop adaptive optics, the deep fading is suppressed and the system BER is greatly reduced.