量子电子学报2025，Vol.42Issue(5)：677-685,9.DOI:10.3969/j.issn.1007-5461.2025.05.009
基于SBS辅助光外差技术的高信噪比微波信号生成
High signal-to-noise ratio microwave signal generation based on SBS assisted optical heterodyne technology
摘要
Abstract
In this work,the generation of high signal-to-noise ratio(SNR)single-frequency microwave signal without noise sidebands is demonstrated based on the interaction of integrated all-fiber lasers.The microwave signals are generated by the interference between a narrow linewidth Brillouin pump light from a single-frequency laser and the Stokes light generated by it.Firstly,the linewidths of the Stokes lights are compressed to～43 Hz based on the stimulated Brillouin scattering(SBS)effect,which ensures that the frequency noise is as low as possible.And then,the relative intensity noise(RIN)of the first-order Stokes light is reduced by 21 dB/Hz based on the noise dynamics principle in cascaded SBS effect.By simultaneously reducing the frequency noise and the intensity noise of the coherent signals,the noise sidebands of microwave signals are completely suppressed.As result,the SNR of the microwave signal is improved from 48 dB to 84 dB at the first-order Brillouin frequency shift of 9.415 GHz.Meanwhile,a microwave signal with a SNR of 70 dB is generated at the second-order Brillouin frequency shift of 18.827 GHz.This kind of microwave signals with narrow linewidth and high SNR can provide higher detection resolution and higher transmission efficiency for applications on radar,satellite communication and so on.关键词
激光技术/光纤激光器/微波光子学/光学外差技术/噪声抑制Key words
laser techniques/fiber lasers/microwave photonics/optical heterodyne technology/noise suppression分类
信息技术与安全科学引用本文复制引用
罗巧霞,赵中斌,胡天豪,周勇,郑子其,高伟清..基于SBS辅助光外差技术的高信噪比微波信号生成[J].量子电子学报,2025,42(5):677-685,9.基金项目
国家重点研发计划(2022YFB2903102),国家自然科学基金项目(61875052,62105087,62105088,61905059),安徽省重点研发计划项目(202104a07020010),安徽省自然科学基金项目(2108085QF282) （2022YFB2903102）
