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
作者
任伟杰
孙建锋
周煜
卢智勇
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)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第12期84-93,共10页
Acta Optica Sinica
关键词
光通信
多体制兼容
内差检测
开关键控
相移键控
optical communications
multisystem compatibility
intradyne detection
onoff keying(OOK)
phaseshift keying(PSK)
