Brillouin gain spectrum characterization in Ge-doped large-mode-area fibers
Xia-Xia Niu(牛夏夏)1,2, Yi-Feng Yang(杨依枫)1,†, Zhao Quan(全昭)1, Chun-Lei Yu(于春雷)1, Qin-Ling Zhou(周秦岭)1, Hui Shen(沈辉)1, Bing He(何兵)1,‡, and Jun Zhou(周军)1
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
Abstract 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 GeO2 concentration, and the BGS bandwidth initially increases with the augment of GeO2 concentration, and then decreases. The BGSs of four fibers with core diameters of 10 μm and 20 μm for different GeO2 concentrations are compared experimentally. Experimental results demonstrate that with the same core diameter, the variations of BFS and BGS bandwidths with GeO2 concentration accord with the simulation results. Additionally, the BGS characteristics of three large-mode-area passive fibers with diameters of 10 μm, 25 μm, and 30 μm 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 narrow-linewidth fiber lasers and Brillouin fiber amplifiers.
Fund: 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), and the Youth Innovation Promotion Association, Chinese Academy of Sciences (Grant No. 2020252).
Corresponding Authors:
Yi-Feng Yang, Yi-Feng Yang
E-mail: yfyang@siom.ac.cn;bryanho@mail.siom.ac.cn
Cite this article:
Xia-Xia Niu(牛夏夏), Yi-Feng Yang(杨依枫), Zhao Quan(全昭), Chun-Lei Yu(于春雷), Qin-Ling Zhou(周秦岭), Hui Shen(沈辉), Bing He(何兵), and Jun Zhou(周军) Brillouin gain spectrum characterization in Ge-doped large-mode-area fibers 2021 Chin. Phys. B 30 124203
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