多体制兼容相干探测卫星激光通信技术  

Multi-System Compatible Coherent Detection Technology of Satellite Laser Communication

作　　者：任伟杰 孙建锋[3] 周煜[3] 卢智勇[1] 从海胜 姜玉鑫 李超洋 张龙坤 许玲玲 Ren Weijie;Sun Jianfeng;Zhou Yu;Lu Zhiyong;Cong Haisheng;Jiang Yuxin;Li Chaoyang;Zhang Longkun;Xu Lingling(Key Laboratory of Space Laser Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Laboratory of Space Laser Engineering,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]中国科学院上海光学精密机械研究所空间激光传输与探测技术重点实验室,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049 [3]中国科学院上海光学精密机械研究所航天激光工程部,上海201800

出　　处：《光学学报》2023年第12期84-93,共10页Acta Optica Sinica

摘　　要：卫星相干激光通信系统中,信号调制格式以相移键控(PSK)为主,未兼容开关键控(OOK)的相干接收。针对卫星相干光通信接收机不兼容多种调制格式的问题,实验搭建了兼容OOK以及二进制相移键控(BPSK)的相干通信接收装置。在1 Gbit/s的通信速率下,当调制格式为OOK且信号光功率为-54.6 dBm时,误码率(BER)为10^(-3),接收灵敏度距离散粒噪声极限3.3 dB;当调制格式为BPSK且信号光功率为-57.95 dBm时,BER为10^(-3),接收灵敏度距离散粒噪声极限4.2 dB。该多体制兼容相干接收机的结构与当前大多数相干接收机的硬件通用,且具有较高的接收灵敏度,证明了卫星相干激光通信多体制兼容技术的可行性,具有重要意义。Objective In the satellite coherent laser communication system,the signal modulation format is mainly phaseshift keying(PSK),which is not compatible with the coherent reception of onoff keying(OOK).In view of the problem that the satellite coherent optical communication receiver is incompatible with various modulation formats,a coherent communication receiver compatible with OOK and binary PSK(BPSK)is built experimentally.At the communication rate of 1 Gbit/s,when the modulation format is OOK,and the signal optical power is−54.6 dBm,the bit error rate(BER)is 10^(−3),and there is a distance of 3.3 dB from the shot noise limit;when the modulation format is BPSK,and the signal optical power is−57.95 dBm,the BER is 10^(−3),and there is a distance of 4.2 dB from the shot noise limit.The multisystem compatible coherent receiver shares a common structure with many coherent receiver hardware at present and has high receiving sensitivity.It verifies the feasibility of the multisystem compatible technology of satellite coherent laser communication and is of great significance.Methods As the current mainstream satellite communication modulation formats,BPSK and OOK will exist for a long time.Therefore,this paper experimentally builds a coherent receiver compatible with OOK and BPSK.Firstly,the optimal local optical power of the balanced detector used in this experiment is measured by the experimental setup shown in Fig.4.When the optical modulation format of the signal is OOK,the inphase(I)and quadrature(Q)signals are firstly complexed,then the modulus of the complex signal is calculated,and finally the threshold judgment method is used for verification.When the optical modulation format of the signal is BPSK,the realtime carrier phase difference is calculated by the complex digitization and IQ arctangent method,and the baseband signal can be obtained after the carrier recovery of the BPSK signal.The demodulation of the overall signal relies on offline processing,and Fig.8 shows the specific flow of offline processi

关 键 词：光通信 多体制兼容 内差检测 开关键控 相移键控 

分 类 号：O436[机械工程—光学工程]