基于锯齿波调制非平坦光频梳的信道化多频测量  

Channelized Multi-Frequency Measurements Based on Sawtooth Wave Modulated Non-Flat Optical Frequency Combs

作　　者：蒋玉政 李晶[1] 朱伟 裴丽[1] 宁提纲[1] Jiang Yuzheng;Li Jing;Zhu Wei;Pei Li;Ning Tigang(Institute of Lightwave Technology,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学光波技术研究所,北京100044

出　　处：《光学学报》2023年第22期89-99,共11页Acta Optica Sinica

基　　金：国家自然科学基金(62235003,62221001);中央高校基本科研业务费(2022JBMC004)。

摘　　要：研究了一种基于非平坦光频梳的多频率瞬时信号检测方案。该方案采用待测多频信号与锯齿波共同调制,在加载电信号的同时实现非平坦光频梳的生成,并最终利用拍频后成对电信号的功率比值实现对微波频率的标定。通过将待测信号调制与光频梳生成合并的方式可避免多条支路检测的不平衡变化,系统测频范围可通过改变锯齿波频率调节。仿真实现了在0.3~40 GHz的频率范围内,测量误差小于40 MHz的微波信号多频测量。此外,分析了待测射频功率和调制器偏置漂移的影响,结果显示,该系统可辨识待测信号的最小功率为-10 dBm,而且对调制器偏置漂移不敏感。Objective Microwave frequency measurement technology plays an important role in various defense and civil applications,such as electronic warfare,radar,and wireless communications.Microwave frequency measurements can be achieved by conventional electrical methods.Although high-resolution multi-frequency signal measurement is achieved,the frequency measurement range is limited by electronic bottlenecks,and the measurement system is susceptible to electromagnetic interference,while photonic-assisted frequency measurement based on photonics can not only overcome such problems but also has the advantages of high flexibility and high speed.In general,photonic-assisted instantaneous frequency measurement systems work in three ways,which are frequency power mapping(FTPM),frequency time mapping(FTTM),and frequency space mapping(FTSM).FTPM-based schemes have the advantages of good real-time performance and high accuracy,but most of them have great difficulties in measuring multi-frequency microwave signals.FTTM-based schemes are easy to implement the measurement of multi-frequency signals,but they are not applicable in scenarios with real-time requirements.FTSM-based schemes are suitable for handling multi-frequency signals while obtaining accurate frequency information in real time,but they often require filter arrays or wavelength division multiplexers(WDM),which can increase the system complexity and reduce the flexibility of the system.To address the problems of the FTSM-based scheme,we propose a multi-frequency signal transient detection scheme without optical filtering.Methods The experimental system is built by using optical simulation software.The system uses a non-flat optical frequency comb modulated by a sawtooth wave to determine the frequency range of the signal by using the beat-to-beam power ratio of the signal to be measured and the optical frequency comb as a reference and then calculates the exact frequency of the signal to be measured from the demodulated frequency information.The system uses the multi-

关 键 词：多频信号 瞬时微波测频 光频梳 信道化 

分 类 号：O436[机械工程—光学工程]