基于受激布里渊散射的多波长光载波生成及应用  

Generation and Application of Multi-Wavelength Optical Carriers Based on Stimulated Brillouin Scattering

作　　者：李奕晗 陈善卓 郭浩 Li Yihan;Chen Shanzhuo;Guo Hao(School of Electrical and Information Engineering,Beihang University,Beijing 100191,China;Shenzhen Institute of Beihang University,Shenzhen 518063,Guangdong,China)

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191 [2]深圳北航新兴产业研究院,广东深圳518063

出　　处：《中国激光》2022年第19期175-183,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(62171008,61801014)。

摘　　要：微波光子和光通信等应用对多波长高相干的光载波有巨大需求。针对传统方案中载波频差与噪声难以兼顾的瓶颈,本文介绍了基于共振泵浦的多波长共腔受激布里渊散射(SBS)激光技术。得益于共腔的激射结构、灵活的泵浦选择以及SBS对激光线宽的压窄效应,该技术在生成频差可控、频相高相关的低噪光载波方面具有显著优势。本文结合已有和最新实验结果,演示并验证了该技术在稳频低噪太赫兹载波生成、高速太赫兹通信、高效相干光通信等领域特定场景下的应用潜力。Objective Multi-wavelength optical carriers play a critical role in applications such as wavelength-division multiplexing(WDM)optical commutation,photonic generation of radio-frequency signals,and photonic wireless communications.Conventional approaches are limited by either the insufficient coherence between optical carriers(e.g.,using an independent-running laser array)or the poor flexibility in choosing the number of optical tones and their spacing in the spectral domain,such as in an optical frequency comb.In this study,we present a technique for generating highly coherent multi-wavelength optical carriers and verify the superiority of the synthesized signals through demonstrative applications in low-noise THz-wave generation,photonic THz wireless communication,and jointly processed WDM optical communication.Methods For a single-wavelength output,a continuous-wave pump laser is frequency-locked to an optical cavity consisting of a fiberized coupler and a spool of standard single-mode fiber.As the frequency of the pump laser is in resonance with one of the longitudinal modes,the optical field inside the optical cavity accumulates exponentially,reaching the threshold of the stimulated Brillouin scattering(SBS),which would otherwise require a much higher pump power if the pump laser is not locked to the cavity mode.A Brillouin spectral gain would appear~10 GHz redshifted from the pump wavelength,and if the free spectral range(FSR)of the cavity matches the width of the spectral gain,only one cavity mode will start to oscillate and produce a narrow-linewidth SBS output in the direction opposite to the pump.For a multi-wavelength output,pump lasers with the desired wavelengths and spectral separations are pumped into the same optical cavity.Through independent frequency locking,the one-to-one correspondence described above allows the generation of the same number of SBS signals while maintaining the frequency separation of the pumps.Coherence between the output optical tones is ensured because the oscillations orig

关 键 词：光通信 受激布里渊散射 光纤激光器 射频光子 

分 类 号：TN24[电子电信—物理电子学]