一种基于并级联MZM的20倍频光生毫米波方案  

A scheme of frequency 20-tupling millimeter-wave generation based on dual-cascaded MZM

作　　者：苏醒 刘小磊 SU Xing;LIU Xiaolei(School of Physics and Electronic Information,Henan Polytechnic University,Jiaozuo,Henna 454003,China)

机构地区：[1]河南理工大学物理与电子信息学院,河南焦作454003

出　　处：《光电子．激光》2023年第12期1233-1240,共8页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金面上项目(12074102);河南理工大学基本科研业务费专项项目(自科类)(NSFRF180404)资助项目。

摘　　要：为进一步提高光载无线通信(radio over fiber,ROF)系统中光生毫米波的倍频系数,提出了一种基于4个马赫-曾德尔调制器(Mach-Zehnder modulator,MZM)共同作用的20倍频毫米波信号产生方案。推导了理想情况下倍频方案的产生机理,在仿真实验中,分别分析了非理想因素下调制器直流偏置电压漂移、调制指数、消光比等对系统性能的影响,结果显示,当合理设置各参数的取值范围,其光边带抑制比(optical sideband suppression ratio,OSSR)和射频杂散抑制比(radio frequency spurious sideband suppression ratio,RFSSR)的饱和值高达33.20 dB和27.21 dB;针对基于此倍频方案的ROF系统,对比分析了2.5 Gbit/s数据信号的单双边带调制两种不同传输方式,仿真结果表明,当光纤距离为40 km时,单边带依旧可达无差错传输,降低了传输过程中码间走离效应的影响,增加了系统的传输距离,更适合远距离传输,为微波光子学的发展提供了一种理论依据。In order to further improve the frequency mutiplication coefficient of photogenerated millimeter-wave in the radio over fiber(ROF)system,a scheme for generating frequency 20-tupling millimeterwave signals based on the interaction of four Mach-Zehnder modulators(MZM)is proposed.The generation mechanism of frequency doubling scheme under ideal conditions is deduced.In the simulation experiment,the influences of DC bias voltage drift,modulation index and extinction ratio on the system performance under non-ideal factors are analyzed respectively.The results show that the saturation values of the optical sideband suppression ratio(OSSR)and the radio frequency spurious sideband suppression ratio(RFSSR)can reach 33.20 dB and 27.21 dB when the range of each parameter is set properly.For the ROF system based on this frequency doubling scheme,two different transmission modes of 2.5 Gbit/s data signal with single tone and dual tone modulation formats are compared and analyzed.The simulation results show that when the optical fiber distance is 40 km,the single sideband can still achieve error-free transmission,which reduces the influence of inter-code walk-off effect in the transmission process,increases the transmission distance of the system,and is more suitable for long-distance transmission.It provides a theoretical basis for the development of microwave photonics.

关 键 词：光载无线芯通信(ROF) 马赫-曾德尔调制器(MZM) 20倍频 毫米波 无滤波 

分 类 号：TN929.1[电子电信—通信与信息系统]