相干光通信消相位模糊载波同步算法  

Unwrapping Phase Ambiguity Carrier Synchronization Algorithm for Coherent Optical Communication

作　　者：李华贵 李少波 刘旭超 马树泉 Li Huagui;Li Shaobo;Liu Xuchao;Ma Shuquan(Optical Communication Research Center,54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050081,Hebei,China;Hebei Key Laboratory of Photonic Information Technology and Application,Shijiazhuang 050081,Hebei,China)

机构地区：[1]中国电子科技集团公司第五十四研究所光通信研发中心,河北石家庄050081 [2]河北省光子信息技术与应用重点实验室,河北石家庄050081

出　　处：《光学学报》2024年第5期77-85,共9页Acta Optica Sinica

基　　金：自主投入发展基金(SXX22689X033)。

摘　　要：相针对基于相位增量的M次方载波同步算法存在的相位模糊问题,分析了相位模糊与系统调制参数之间的关系,并通过对帧同步过程进行改进,实现了载波同步相位模糊的消除。分别基于OptiSystem和集成相干光通信收发机搭建了空间相干光通信仿真系统和实验系统,并利用所提的消相位模糊载波同步算法对接收信号进行了处理。仿真和实验结果表明,所提出的消相位模糊载波同步算法频偏补偿和相差补偿范围不受系统调制速率、调制阶数的约束,具有更好的应用前景。Objective Coherent optical communication technology possesses a significantly higher communication rate and receiver sensitivity,which has been applied in fiber optic networks and space optical communication by researchers.Compared with the optical fiber channel,the space atmospheric channel possesses significant randomness and fluctuation,and the relative motion between the terminals will introduce an additional Doppler frequency shift.Thus,the frequency offset and phase noise of the space optical communication systems are characterized by a large fluctuation range and a fast-changing rate.Traditional coherent optical communication systems realize carrier synchronization mainly by reference light method,optical phase-locked loop method,and digital signal processor(DSP)open-loop carrier synchronization method.However,it is difficult to implement the reference light method in space atmospheric channels with a large dynamic range.The tuning rate of the optical phase-locked loop method is slow,leading to poor performance.Besides,these two methods will lead to a more complex system.An open-loop synchronization scheme is recommended by researchers,although there is phase ambiguity when an open-loop synchronization scheme is used in large dynamic link conditions.Therefore,the optimization of open-loop synchronization schemes is of great significance for meeting the needs of different space optical communication applications.We aim to develop a carrier synchronization algorithm to solve the phase ambiguity problem of coherent optical communication systems with a large frequency offset and large phase noise and to provide a competitive carrier synchronization method for space coherent optical communication systems.We believe that this will be helpful for the development and application of space coherent optical communication technology.Methods Considering the simple implementation and small computation of the Mth power carrier synchronization algorithm,we realize the carrier synchronization algorithm by optimizing the Mt

关 键 词：光通信 相干光通信 相干探测 载波同步 消相位模糊 帧同步 

分 类 号：TN929.1[电子电信—通信与信息系统]