基于电吸收调制激光器的双功能微波光子系统  

Dual-functional Microwave Photonic System Based on Electro-absorption Modulated Laser

作　　者：江芝东 谢溢锋 周沛 唐志刚 李念强 JIANG Zhidong;XIE Yifeng;ZHOU Pei;TANG Zhigang;LI Nianqiang(School of Optoelectronic Science and Engineering,Soochow University,Suzhou 215006,China;Key Lab of Modern Optical Technologies of the Ministry of Education,Soochow University,Suzhou 215006,China)

机构地区：[1]苏州大学光电科学与工程学院,苏州215006 [2]苏州大学教育部现代光学技术重点实验室,苏州215006

出　　处：《光子学报》2023年第1期99-105,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.62001317,62171305,62004135);江苏省自然科学基金(No.BK20200855);信息光子学与光通信国家重点实验室(北京邮电大学)开放基金(No.IPOC2020A012)。

摘　　要：提出了一种基于电吸收调制激光器的双功能系统,可以同时实现微波信号的产生和其相位噪声的测量。该系统由基于电吸收调制激光器的光电振荡器模块和基于光延时线技术的相位噪声测量模块构成。通过使用单个电吸收调制激光器代替激光源和强度调制器,所提出的双功能系统不仅成本低廉、结构简单,而且性能表现优异;有利于在基于OEO的射频系统,特别是信号产生系统的研制、优化与工作过程中,及时评估信号源的质量并作出相应的参数调整以优化其性能,为光电振荡器的相位噪声测试提供了简单的解决方案。实验结果表明,由光电振荡器生成的9.952 GHz信号的边模抑制比为66dB,相位噪声为-116.53dBc/Hz@10kHz。此外,相位噪声测量系统的相位噪声基底达-133.71 dBc/Hz@10 kHz,其测量灵敏度优于商用信号分析仪R&S FSV40。Microwave signal generator is the key component of modern Radio-Frequency(RF) systems, such as navigation, radar, communications, and electronic warfare. Optoelectronic Oscillator(OEO), a new type of microwave oscillator, is able to directly generate a high-frequency microwave signal with low phase noise.Therefore, OEO is considered a promising solution for high-performance microwave signal generation. Phase noise is one of the vital parameters to evaluate the performance of microwave signal sources, including OEO. To date, a number of Phase Noise Measurement(PNM) methods have been designed and carried out to accurately measure the phase noise of microwave signal sources, including direct spectrum method, phase detector method, and frequency discriminator method. Among these methods, the frequency-discriminator-based PNM method is more attractive since it can eliminate the requirement of a low phase noise reference oscillator. However, the measurement sensitivity of this method is related to the time delay, which is limited by the large loss of electrical cables. Fortunately, a photonic delay line PNM method has been proposed with a high measurement sensitivity, where a section of optical fiber is applied to provide a long-time delay with negligible loss. In recent years, a lot of efforts have been devoted to improving the overall performance of the photonic delay line PNM system. For instance, a microwave photonic phase shifter and microwave photonic mixer have been employed to replace the electrical phase shifter and mixer of a traditional photonic delay line PNM system to extend the operation bandwidth. In addition, digital phase demodulation is adopted to eliminate the calibration procedure. Nevertheless, a problem with most previous photonic delay line-based schemes is that too many discrete electrical and optical components are used, which makes them bulky and leads to considerable coupling loss. Furthermore, the functionality of current photonic delay line PNM systems is relatively homogeneous, with only p

关 键 词：相位噪声测量 微波信号产生 微波光子 光电振荡器 电吸收调制激光器 

分 类 号：TN929.1[电子电信—通信与信息系统]