Brillouin gain spectrum characterization in Ge-doped large-mode-area fibers  

作　　者：Xia-Xia Niu Yi-Feng Yang Zhao Quan Chun-Lei Yu Qin-Ling Zhou Hui Shen Bing He Jun Zhou 牛夏夏;杨依枫;全昭;于春雷;周秦岭;沈辉;何兵;周军(Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics B》2021年第12期418-423,共6页中国物理B（英文版）

基　　金：Project supported by the Key-Area Research and Development Program of Guangdong Province,China(Grant No.2018B090904001);the National Natural Science Foundation of China(Grant Nos.61805261,61405202,and 61705243);the Youth Innovation Promotion Association,Chinese Academy of Sciences(Grant No.2020252)。

摘　　要：The dependence of Brillouin gain spectrum(BGS)characteristics,including the Brillouin frequency shift(BFS)and the BGS bandwidth,on germanium concentration in large-mode-area Ge-doped passive fibers is investigated theoretically and experimentally.The simulation results show that the BFS is inversely proportional to GeO_(2)concentration,and the BGS bandwidth initially increases with the augment of GeO_(2)concentration,and then decreases.The BGSs of four fibers with core diameters of 10μm and 20μm for different GeO_(2)concentrations are compared experimentally.Experimental results demonstrate that with the same core diameter,the variations of BFS and BGS bandwidths with GeO_(2)concentration accord with the simulation results.Additionally,the BGS characteristics of three large-mode-area passive fibers with diameters of 10μm,25μm,and 30μm are measured,which confirm that the increasing of the fiber diameters will cause the BGS bandwidth to broaden.We believe that these results can provide valuable references for modulating the high-power narrowlinewidth fiber lasers and Brillouin fiber amplifiers.

关 键 词：stimulated Brillouin scattering Brillouin gain spectrum large-mode-area fibers fiber laser 

分 类 号：TN253[电子电信—物理电子学]