Transient Bragg fiber gratings formed by unpumped thulium doped fiber  

作　　者：Shui ZHAO Ping LU Li CHEN Deming LIU Jiangshan ZHANG 

机构地区：[1]National Engineering Laboratory for Next Generation Internet Access System, Huazhong University of Science and Technology, Wuhan 430074, China [2]School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China [3]Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

出　　处：《Frontiers of Optoelectronics》2013年第2期180-184,共5页光电子前沿（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China （Grant Nos. 61275083, 61290315）.

摘　　要：A theoretical introduction of saturable absorber based on standing-wave saturation effects as a transient fiber Bragg grating （FBG） was presented. The central wavelength of the transient FBG was located in 2 μm. The factors affecting the bandwidth and the reflectivity of the transient FBG were analyzed. The linewidth and reflectiv- ity as the function of doped fiber length and doping concentration were correspondingly simulated by Matlab software. It was found that the larger the doping concentration and the fiber length were, the smaller the bandwidth was. These results suggest that the performance of the transient FBG can be optimized by choosing the appropriate length of doped fiber and the larger doping concentration, which can be used as a reference for the narrow-linewidth fiber laser around 2 μm.A theoretical introduction of saturable absorber based on standing-wave saturation effects as a transient fiber Bragg grating （FBG） was presented. The central wavelength of the transient FBG was located in 2 μm. The factors affecting the bandwidth and the reflectivity of the transient FBG were analyzed. The linewidth and reflectiv- ity as the function of doped fiber length and doping concentration were correspondingly simulated by Matlab software. It was found that the larger the doping concentration and the fiber length were, the smaller the bandwidth was. These results suggest that the performance of the transient FBG can be optimized by choosing the appropriate length of doped fiber and the larger doping concentration, which can be used as a reference for the narrow-linewidth fiber laser around 2 μm.

关 键 词：narrow-linewidth fiber laser saturable absor- ber thulium doped fiber （TDF） 

分 类 号：TN253[电子电信—物理电子学] TK124[动力工程及工程热物理—工程热物理]