模分复用系统中的CPR-MIMO-CMA研究  

CPR-MIMO-CMA in Mode Division Multiplexing Systems

作　　者：杨步高 田凤[1] 刘小东 Yang Bugao;Tian Feng;Liu Xiaodong(School of Electronic Engineering,State Key Laboratory of Information Photonics and Optical Communication,Beijing Key Laboratory of SpaceGround Interconnection and Convergence,Beijing University of Posts and Telecommunications,Beijing 100876,China;Beijing Ancoren Technology Co.,Ltd,Beijing 101102,China)

机构地区：[1]北京邮电大学电子工程学院,信息光子学与光通信国家重点实验室,天地互联与融合北京市重点实验室,北京100876 [2]北京安科慧生科技有限公司,北京101102

出　　处：《光学学报》2024年第5期69-76,共8页Acta Optica Sinica

基　　金：国家重点研发计划(2018YFB1800900,2020YFB1805805);国家自然科学基金(62021005,62027817);常州市重点研发计划(CE20225005);装备预研教育部联合基金项目(8091B032133)。

摘　　要：针对模分复用系统中由于模式耦合引入的信道串扰(XT)的问题,提出一种基于信号相关峰提取的XT相关比测量方法,并将XT相关系数应用于多进多出恒模盲均衡算法(CPR-MIMO-CMA)中以提升信道均衡效果。搭建了少模光纤传输的实验平台,利用CPR-MIMO-CMA对接收端数据进行处理,研究结果表明,在满足前向纠错(FEC)为3.8×10^(-3)的门限下,所提出的CPR-MIMO-CMA在LP01、LP11、LP21三模信道中比传统CMA分别具有1.3 dB、0.9 dB、1.0 dB的性能增益,并且3个模式下的平均收敛时间减少约50%。Objective With the rapid development of technologies such as the Internet and artificial intelligence,the demand for data in various fields of life is growing exponentially.However,the capacity of traditional single-mode fiber(SMF)networks is approaching the Shannon limit.Therefore,various multiplexing technologies including wavelength division multiplexing(WDM),polarization multiplexing(PDM),and mode division multiplexing(MDM)have been explored to meet the growing demand for data.In MDM,FMF fibers for long-distance transmission have lower nonlinear losses than multimode fibers,which makes it more cost-effective.Additionally,MDM introduces severe crosstalk among different modes,which should be compensated for by advanced DSP algorithms at the receiving end.We propose a crosstalk correlation ratio measurement method based on signal correlation peak extraction to address the channel crosstalk caused by mode coupling in MDM systems.The crosstalk correlation coefficient is applied to the correlation peak ratio multi-input-multioutput constant modulus algorithm(CPR-MIMO-CMA)to improve channel equalization performance.An SMF optic transmission experimental platform is built,and the CPR-MIMO-CMA is utilized to process the data from the receiving end to verify the algorithm superiority.The experimental results show that the proposed algorithm has a significant improvement in both convergence speed and balancing effect compared to traditional CMA,and is expected to be employed in future high-capacity FMF transmission scenarios.Methods Firstly,we model and calculate the coupling mode equation and coupling coefficient,and derive the expression of the coupling coefficient in FMF and also the relationship between the signal correlation peak and it.Then,the FMF transmission system is built using simulation software.The signal generation end of the system is responsible for generating repetitive and misaligned digital signals.Then,the mode laser generator generates LP01 mode and LP11 mode optical signals,which are modulated by

关 键 词：光通信 模分复用 模间串扰 信号相关峰 模式均衡 

分 类 号：TN913.7[电子电信—通信与信息系统]