The wavefront distortion caused by atmospheric turbulence seriously affects the performance of free-space optical communication (FSOC) system. Adaptive optics (AO) technology has been proven to be an effective method to suppress atmospheric turbulence. Two laser communication terminals equipped with AO system are designed and manufactured, which are used in the horizontal link near the ground. In the laboratory simulation, 100-Gbps data transmission can be realized under moderate turbulence (D / r0 < 10), the bit error rate (BER) is better than 1 × 10 − 6, and the measured single-mode fiber coupling efficiency is 42% to 48%. 10-Gbps data transmission can be realized under strong turbulence (D / r0 > 10), and the BER is better than 1 × 10 − 6. The BER is high in the practical communication test under the urban horizontal link of 1 km (D / r0 = 10), the BER is 1 × 10 − 3, and the coupling efficiency is 12% to 20%. Finally, to achieve the goal of 100-Gbps FSOC for near ground and long distance, based on the experimental performance of the existing two sets of laser communication system, the solution of laser communication system is proposed, which provides a reference for relevant researchers.

中文翻译：

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自适应光学技术与城市水平链路激光通信系统

大气湍流引起的波前畸变严重影响自由空间光通信（FSOC）系统的性能。自适应光学（AO）技术已被证明是抑制大气湍流的有效方法。设计制造了两台装有AO系统的激光通信终端，用于近地面水平链路。在实验室模拟中，在中等湍流（D / r0 < 10）下可实现100-Gbps数据传输，误码率（BER）优于1×10 − 6，实测单模光纤耦合效率为42% 到 48%。强湍流下（D/r0>10）可实现10Gbps数据传输，BER优于1×10-6。1公里城市水平链路下的实际通信测试误码率高（D/r0=10），误码率为1×10-3，耦合效率为12%～20%。最后，为实现近地远距离100-Gbps FSOC的目标，基于现有两套激光通信系统的实验性能，提出了激光通信系统的解决方案，为相关研究人员提供参考。