频率间隔可切换多波长布里渊随机光纤激光器  

Frequency Interval Switchable Multi-Wavelength Brillouin Random Fiber Laser

作　　者：杨茜[1] 周泽中 刘恺 张祖兴[1] Yang Qian;Zhou Zezhong;Liu Kai;Zhang Zuxing(Advanced Photonic Technology Lab,College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China)

机构地区：[1]南京邮电大学电子与光学工程学院先进光子技术实验室,江苏南京210023

出　　处：《中国激光》2022年第11期21-29,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(62175116,91950105);江苏省研究生科研与实践创新计划项目(SJCX21_0276)。

摘　　要：设计出一种宽带、频率间隔可切换的多波长布里渊随机光纤激光器。该激光器具有双开腔结构,通过调节前、后向布里渊泵浦功率比,可以实现输出多波长激光在单倍与双倍布里渊频移间隔之间切换。结果显示,当拉曼泵浦功率设置为831.8 mW时,得到了44.5 nm(1528~1572.5 nm)输出带宽内共253阶双倍频移间隔(~0.176 nm)的斯托克斯线,以及42.5 nm(1532~1574.5 nm)输出带宽内共483阶单倍频移间隔(~0.088 nm)的斯托克斯线。频率间隔可切换多波长布里渊随机光纤激光器有望拓宽多波长激光器在光通信和传感等领域的应用范围。Objective The multi-wavelength laser using random fiber lasers promises to become an ideal light source for wavelength division multiplexing(WDM)and dense wavelength division multiplexing(DWDM),with broad application prospects in 5 G communication systems and sensing systems.Recently,the combination of stimulated Brillouin scattering(SBS)and stimulated Raman scattering(SRS)and random distributed feedback using Rayleigh scattering have achieved a multi-wavelength cascade output,which has been widely used in many research on random lasers.However,one main challenge of Brillouin Raman random fiber lasers is to realize Brillouin Stokes light(BSL)output with switchable wavelength intervals in a wider bandwidth.In this paper,we propose a double open cavity random fiber laser using the cascaded SBS to obtain BSLs of 253 double shift intervals(~0.176 nm)in the output range of 44.5 nm(1528--1572.5 nm)and 483 single shift intervals(~0.08 nm)in the range of 42.5 nm(1532--1574.5 nm)by adjusting the forward and reverse BP power ratio.This easy-to-build,interval switchable multi-wavelength Brillouin random fiber laser meets the demand for multi-wavelength sources in DWDM and optical sensing systems,further expanding the application area and increasing the flexibility of multi-wavelength output.They have good application prospects in the fields of sensing and optical communications.Methods In the current laser configuration,the bi-directional Brillouin pump design is obtained using optical couplers(OCs)with different splitting ratios to divide BP light into two parts,which are coupled into the cavity through port 1of two circulators(Cir1and Cir2).This allows the forward and backward BPs to enter the linear cavity in opposite directions,and experience SBS in a DCF pumped by the RP,which continues the cascade process.The cascade process continues until the BSL amplified in a certain order is limited by the Raman amplification efficiency,and does not reach the SBS threshold for the next order.Additionally,a circulator(Cir3)is conn

关 键 词：激光器 随机激光 频率间隔可切换 受激布里渊散射 

分 类 号：TN248.1[电子电信—物理电子学]