基于有限冲激响应滤波算法的APD光接收机设计  

Design of APD Laser Receiver Based on Finite Impulse Response Filtering Algorithm

作　　者：孟凡斌[1] 李欣 毛剑英 MENG Fan-bin;LI Xin;MAO Jian-ying(Academy of Opto-Electronics,China Electronics Technology Group Corporation(AOE CETC),Tianjin,China;Institute of Systems Engineering,Air Force Research Institute,Beijing,China;Harbin Air Force Flight Academy,Harbin,China)

机构地区：[1]中国电子科技集团公司光电研究院,天津 [2]空军研究院系统工程所,北京 [3]哈尔滨飞行学院,哈尔滨

出　　处：《光电技术应用》2021年第4期20-23,65,共5页Electro-Optic Technology Application

摘　　要：自由空间激光通信以其传输速率高、保密性能好、体积质量小等特性,在无线通信领域具有广泛的应用前景,特别是卫星领域,可有效解决微波通信通信速率低、体积大等问题。为实现远距离、高速率的星间激光通信系统,有必要引入一种数字激光通信接收机,灵活地抑制干扰和噪声,提高通信灵敏度。根据数字通信误差概率的原理,设计了基于现场可编程门阵列(FP-GA)的数字接收机。采用有限脉冲响应、动态阈值、基带中值等滤波算法,优化信噪比,提高检测灵敏度。同时,设计了1550 nm激光通信接收机灵敏度测试实验结构,并进行了检测灵敏度实验。实验结果表明,雪崩光电二极管(APD)接收机在Mbps数量级的通信速率下,实现了接近理论设计值的探测灵敏度-52.57 dBm。通过数字滤波算法信噪比提高了约10 dB,为卫星激光通信的接收机设计提供了理论指导。Free-space laser communication has a wide range of application prospects in the field of wireless communication due to its high transmission rate,good security performance,small volume and mass.It can effectively solve the problems of low communication rate and large volume in microwave communication,especially in the satellite field.In order to realize a long-distance,high-speed inter-satellite laser communication system,it is necessary to introduce a digital laser communication receiver to flexibly suppress interference and noise and improve communication sensitivity.According to the principle of digital communication error probability,a digital receiver based on field programmable gate array(FPGA)is designed.Filtering algorithms such as finite impulse response,dynamic threshold and baseband median are used to optimize the signal-to-noise ratio and improve detection sensitivity.At the same time,the sensitivity testing experimental structure of the 1550 nm laser communication receiver is designed,and the sensitivity testing experiment is carried out.Experimental results show that the avalanche photo diode(APD)receiver achieves a detection sensitivity of-52.57 dBm close to the theoretical design value at a communication rate of the order of Mbps.The signal-to-noise ratio is increased by about 10 dB through the digital filtering algorithm,which provides theoretical guidance for the receiver design of satellite laser communication.

关 键 词：自由空间光通信 雪崩光电二极管探测器 探测灵敏度 有限冲激响应滤波算法 

分 类 号：TN929.1[电子电信—通信与信息系统]