基于双平行MZM调制器的矢量毫米波信号传输性能分析  

Analysis of vector millimeter wave signal transmission performance based on dual parallel MZM modulators

作　　者：孟昭 赵峰 田昺瑶 王肖 杨雄伟 赵林仙 MENG Zhao;ZHAO Feng;TIAN Bingyao;WANG Xiao;YANG Xiongwei;ZHAO Linxian(School of Electronic Engineering,Xi′an University of Posts and Telecommunications,Xi′an 710121,Shaanxi,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121

出　　处：《光电子．激光》2022年第11期1183-1191,共9页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61875164);陕西省创新能力支撑计划(2021TD-09)资助项目

摘　　要：提出了一种基于双平行马赫-曾德尔调制器(dual parallel Mach-Zehnder modulators,DP-MZM)的单边带矢量毫米波信号产生和传输方案,在MATLAB和VPI联合仿真环境下分析了90 GHz波段不同调制格式信号的产生和传输性能。仿真中,DP-MZM工作在光载波抑制(optical carrier suppression,OCS)模式时,小信号驱动的两个子调制器输出的单边带信号相互叠加后,无需使用滤波器,可以实现完全抑制中心载波的效果。结果表明:经过该系统传输后,各调制信号的误码率(bit error rate,BER)均可达到硬判决前向纠错(hard judgment forward error currection,HD-FEC)阈值。概率整形后正交幅度调制信号的误码性能明显优于均匀正交幅度调制信号,其中,7 bit/symbol概率整形256阶正交幅度调制(probability shaping 256 quadrature amlitude modulation,PS-256QAM)信号经过系统传输后功率增益最为明显,经过50 km光纤传输后,提升了2.94 dB的功率增益。与目前存在的载波抑制毫米波产生方案相比,该系统结构相对简单,可调节度高,信号传输增益明显,因此具有一定的应用价值。A scheme of single sideband vector millimeter wave signal generation and transmission based on double parallel Mach-Zehnder modulators(DP-MZM)is proposed.Under the joint simulation environment of MATLAB and VPI,the generation and transmission performance of different modulation formats in 90 GHz band are analyzed.In the simulation,when the DP-MZM works in the optical carrier suppression(OCS)mode,the single sideband signals of the two submodulators driven by small signal superimpose each other without the use of filters,the center carrier can be completely suppressed.The results show that the bit error rate(BER)of each modulation signal can reach the hard decision forward error correction(HD-FEC)threshold.The error performance of the quadrature amplitude modulation signal after probability shaping is obviously better than that of the uniform quadrature amplitude modulation signal,and the power gain of the 7 bit/symbol probility shaping 256 quadrature amplitude modulation(PS-256 QAM)signal after systematic transmission is the most obvious,the power gain of 2.94 dB is increased after transmission of 50 km optical fibers.Compared with the existing schemes of carrier supresion millimeter wave,the system has the advantages of simple structure,high adjustability and obvious signal transmission gain,so it has certain application value.

关 键 词：双平行马赫曾德尔调制器(DP-MZM) 光载波抑制(OCS) 概率整形高阶正交幅度调制(PS-MQAM) 误码率(BER) 

分 类 号：TN761[电子电信—电路与系统] TN929.5