基于双路光电反馈下光注入半导体激光器的高性能线性调频信号产生  

High-performance linear frequency-modulated signal generation based on optically injected semiconductor laser with dual-loop optoelectronic feedback

作　　者：周沛 张仁恒 朱尖 李念强 Zhou Pei;Zhang Ren-Heng;Zhu Jian;Li Nian-Qiang(School of Optoelectronic Science and Engineering,Soochow University,Suzhou 215006,China;Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China,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,江苏省先进光学制造技术重点实验室,教育部现代光学技术重点实验室,苏州215006

出　　处：《物理学报》2022年第21期148-155,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62001317,62004135,62171305);江苏省自然科学基金(批准号:BK20200855);江苏省高等学校自然科学研究项目(批准号:20KJB510011)资助的课题。

摘　　要：提出了一种基于双路光电反馈下,光注入半导体激光器的高性能微波线性调频信号产生方案,并进行了实验验证.在合适的注入参数下,光注入半导体激光器可工作于单周期振荡态,生成频率由注入强度和失谐频率决定的可调谐微波信号.通过加载波形为类三角波的电压信号控制注入强度,光注入半导体激光器可生成宽带微波线性调频信号.进一步通过引入延时匹配的双路光电反馈环路,来提升光注入半导体激光器生成线性调频信号的质量:分别基于傅里叶域模式锁定原理和自注入锁定技术,引入短环光电反馈和长环光电反馈,以同时实现线性调频信号的梳齿信噪比提升和线宽窄化.在验证实验中,本方案产生了带宽为8 GHz(18—26 GHz)的线性调频信号,其梳齿信噪比达到40 dB,梳齿线宽为1 kHz.实验结果证明了本方案能够生成同时具有大带宽、高梳齿信噪比、窄线宽且相位关系稳定的高性能微波线性调频信号.Linear frequency-modulated(LFM)waveforms have numerous applications in high-resolution radar detection,high-speed wireless communication,and high precision measurement.The generation of LFM microwave signals based on conventional electronic technologies is limited in their center frequency and bandwidth,which are usually less than a few gigahertz.Fortunately,the inherently large bandwidth offered by photonic technology is very hopeful of breaking through the electronic bottleneck.A variety of photonics-based approaches to generating the LFM waveforms have been reported,including the frequency-to-time mapping method and the external modulation method.However,these solutions suffer poor tunability or expensive RF sources.In recent years,the LFM waveform generation based on optically injected semiconductor lasers(OISLs)has attracted increasing attention.By introducing a low-speed electrical signal to control the period-one(P1)dynamics of an OISL,the LFM waveforms with a large bandwidth are generated.Nonetheless,the generated microwave signal has poor spectral purity,which restricts its many practical applications.In this work,a high-performance microwave LFM waveform generation scheme based on an OISL with dual-loop optoelectronic feedback is proposed and demonstrated experimentally.In this scheme,the optical injection strength of an OISL is controlled first by a triangular-like voltage signal to generate LFM waveforms with a large bandwidth.Then,the quality of the generated LFM signal is comprehensively improved by introducing a delay-matched dual-loop optoelectronic feedback structure.Based on the Fourier domain mode locking principle(FDML)and the self-injection locking technique,both a short-delay optoelectronic feedback loop and a long-delay optoelectronic feedback loop are introduced to simultaneously improve the spectral purity and phase stability of the generated LFM signals.In the proof-of-concept experiment,by analyzing the spectral quality and phase deviation of the generated LFM signal,a comb contrast of

关 键 词：半导体激光器 光注入 线性调频信号 光电反馈 

分 类 号：TN248.4[电子电信—物理电子学]