OOK与BPSK兼容激光通信性能分析  

Performance Analysis of OOK and BPSK Compatible Laser Communication

作　　者：朱福南 李佳蔚[3] 鲁绍文 陈卫标[1,2,3] Zhu Funan;Li Jiawei;Lu Shaowen;Chen Weibiao(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信息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工程部,上海201800

出　　处：《激光与光电子学进展》2024年第7期191-201,共11页Laser & Optoelectronics Progress

基　　金：上海市自然科学基金(21ZR1427700)。

摘　　要：为适应空间激光通信组网技术,多体制复用的通信方式应运而生。发送端采用强度调制器兼容实现了开/关键控(OOK)和二进制相移键控(BPSK)调制,接收端通过内差探测方式兼容实现了这两种调制信号的解调。在实际工程应用中,激光通信系统中散粒噪声、电子器件热噪声不可避免地会影响通信性能,在此基础上,进一步分析了强度调制器偏压点误差量与光学滤波器带宽大小对于非相干OOK和相干BPSK通信信噪比的影响。仿真结果表明:光学滤波器带宽对非相干OOK通信性能影响较大,接收光功率−46 dBm时,1 nm滤波带宽的非相干OOK信噪比开销约1.26;接收光功率−50 dBm以下时,20 nm滤波带宽的相干BPSK信噪比开销小于0.02。非相干OOK无编码通信灵敏度在1.25 Gbit/s速率时需满足−46 dBm@10^(−6),光滤波带宽应不大于0.8 nm,强度调制器偏压误差应控制在半波电压的1%以内。在消共模噪声和优化光滤波带宽条件下,1.25 Gbit/s速率的BPSK无编码通信灵敏度满足−55 dBm@10−6。To adapt to the networking technology of space laser communication,the multi-system multiplexed communication mode was developed.In the transmitter,an intensity modulator is used to realize on-off keying(OOK)and binary phase shift keying(BPSK)modulation compatibility;while in the receiver,demodulation of these two modulation signals is realized via intradyne detection.In practical engineering applications,shot noise and thermal noise of electronic devices in laser communication system will inevitably affect the communication performance.Accordingly,the influences of bias point error of intensity modulator and optical filter bandwidth on the signal-to-noise ratio of incoherent OOK and coherent BPSK communication are further analyzed herein.Simulation results show that the optical filter bandwidth significantly influences the incoherent OOK communication performance:the incoherent OOK SNR overhead of 1 nm filter bandwidth is approximately 1.26 when the received optical power is−46 dBm;the coherent BPSK SNR overhead of 20 nm filter bandwidth is less than 0.02 when the received optical power is below−50 dBm.If the codeless communication sensitivity of incoherent OOK is required to meet−46 dBm@10^(−6) at the rate of 1.25 Gbit/s,the optical filter bandwidth should not be greater than 0.8 nm,the bias error of the intensity modulator should be controlled within 1% of the half-wave voltage.Under the condition of common-mode noise elimination and optimized optical filter bandwidth,the codeless sensitivity of BPSK communication at 1.25 Gbit/s rate is satisfactory to−55 dBm@10−6.

关 键 词：激光通信 多体制复用 强度调制器 内差解调 光滤波带宽 

分 类 号：O436[机械工程—光学工程]