基于级联DMZM的24倍频ROF系统  

Frequency 24-tupling ROF System Based on Cascaded DMZM

作　　者：刘小磊 苏醒 LIU Xiao-lei;SU Xing(School of Physics and Electronic Information,Henan Polytechnic University,Jiaozuo 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：《量子光学学报》2023年第1期77-84,共8页Journal of Quantum Optics

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)。

摘　　要：为提高光载无线(radio over fiber,ROF)中光生毫米波的倍频系数及降低系统的复杂度,提出了一种基于级联双驱动马赫曾德尔调制器(dual-drive Mach-Zehnder modulator,DMZM)与高非线性光纤(highly nonlinear fiber,HNLF)相结合的24倍频毫米波光载无线通信系统;通过调节参数使两个调制器均工作在最大偏置点,产生频谱纯净的四阶光边带,采用单边带调制的方式将数据信号加载到4阶边带而后两边带耦合传输,经过HNLF的四波混频效应后滤波得到12阶光边带,最终由光电探测器(photo detector,PD)拍频生成高质量的24倍频毫米波信号。此外,分析了HNLF的长度、入纤光功率以及标准线性光纤对系统性能的影响,仿真结果表明,当系统处于无差错传输时,背靠背(back-to-back,BTB)传输与经30 km光纤传输后的功率代价为2.5 dB。该方案结构简单、成本低廉、倍频系数高,为微波光子学的发展提供了一种新途径。Since the beginning of the 21st century,cloud computing,big data and artificial intelligence have swept the world.The explosive growth of information has made stable communication with low delay,high speed,large capacity,easy to access become the development trend.However,the existing medium and low frequency spectrum resources are tight and the frequency band is crowded,which is not enough to meet the needs of communication.The high frequency band,especially the millimeter wave band,is rich in spectrum resources and meets the needs of a high signal transmission rate.Therefore,the working frequency of the signal is developing towards high frequency microwave or even millimeter wave band.Due to the"rate bottleneck"of electronic devices,it is difficult to generate and transmit high-frequency millimeter wave signals based on traditional electrical methods.The development of microwave photonics provides a new way for the generation,processing and transmission of high-frequency millimeter wave signals.Combining the advantages of optical fiber communication and wireless communication,the radio over fiber(ROF)technology provides great convenience for mass access and wireless transmission at present,and has broad application prospects.High frequency factor millimeter-wave technology based on external modulator is one of the most promising millimeterwave generation technologies,in the field of microwave photonics,which can realize the transformation from low frequency RF driving signal to high frequency millimeter-wave signal.In order to improve the frequency doubling coefficient and reduce the complexity of the system of the millimeter-wave signal generation in the radio over fiber,a 24-frequency millimeter wave optical wireless communication system based on the combination of cascaded dual-drive Mach Zehnder modulator(DMZM)and high nonlinear fiber(HNLF)is proposed.By adjusting the parameters,the two modulators work at the maximum bias point to generate the fourth-order optical sideband with pure spectrum.The data signal

关 键 词：毫米波 24倍频 双驱动马赫曾德尔调制器 高非线性光纤 四波混频 光载无线通信 

分 类 号：TN929.11[电子电信—通信与信息系统]