基于DPMZM的多体制兼容卫星激光通信技术  

Multi⁃System Compatible Satellite Laser Communication Technology Based on DPMZM

作　　者：陈欣予 朱韧[1] 鲁绍文 侯霞[1,2] 杜耀辉 贺辉 朱晓智 陈卫标 Chen Xinyu;Zhu Ren;Lu Shaowen;Hou Xia;Du Yaohui;He Hui;Zhu Xiaozhi;Chen Weibiao(Aerospace Laser Technology and System Department,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)

机构地区：[1]中国科学院上海光学精密机械研究所空天激光技术与系统部,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049

出　　处：《中国激光》2024年第17期229-239,共11页Chinese Journal of Lasers

摘　　要：卫星激光通信具有高速率、无频谱资源冲突、体积功耗小、保密性强等优势,是实现卫星互联网星座间高速互联的核心技术。为提高激光通信终端对不同通信体制的适应性,解决不同星座间通信兼容的问题,可采用多体制通信兼容技术。针对星间激光通信对相干、非相干光通信兼容的需求,搭建兼容开关键控(OOK)、二进制相移键控(BPSK)和正交相移键控(QPSK)的激光通信发射系统,兼容BPSK和QPSK的激光通信接收系统。该系统发射速率分档可调,最低为10 Mbit/s的OOK,最高为5 Gbit/s的QPSK;发射通信速率为5 Gbit/s的QPSK信号时,通信接收灵敏度达到-50 dBm,译码后误比特率(BER)小于1×10^(-7),发射误差矢量幅度(EVM)优于9%。实验结果表明,该星间激光通信多体制兼容系统设计有一定的可行性,具有重要的意义。Objective With the continuous development of communication technology,the space laser communication system and standards are also constantly evolving and improving.The modulation technology types for space laser communication are varied.The traditional space laser communication generally adopts the intensity modulation/direct detection(IM/DD)mode,which is easy to implement and economical but has low detection sensitivity and is prone to interference.In contrast,laser communication systems with phase modulation/coherent detection have good wavelength selectivity,allowing for high-speed data transmission while maintaining high reception sensitivity.Most laser communication devices only have a single modulation communication method,which results in a single application scenario and poor interconnectivity among various engineering projects,and can no longer satisfy the requirements of satellite internet.Because different communication systems have different advantages and disadvantages,they are suitable for different application scenarios.If multiple modulation formats can be compatible with a single system and can be switched freely,then this system is suitable for various practical conditions,significantly improving the reliability,flexibility,and efficiency of space optical communication systems.Moreover,communication costs can be reduced by selecting the appropriate communication system.Therefore,many researchers have studied laser communication systems that are compatible and switchable with multiple modulation formats.Methods The multi-compatible system developed in this study is based on a double parallel Mach-Zehnder modulator(DPMZM).Multiple emission formats can be achieved by changing the bias voltage on the DPMZM electrodes to operate at different operating points.First,we introduce the bias control method,which combines power and pilot detection methods.It uses a stepwise control method,which is mainly divided into two steps:coarse scanning and fine tracking.In the coarse scanning process,the power detect

关 键 词：光通信 多体制兼容技术 外差相干探测 正交相移键控 

分 类 号：TN929.13[电子电信—通信与信息系统]