横向模式可切换的少模环形光纤激光器  

Transverse-Mode Switchable Few-Mode Ring Fiber Lasers

作　　者：李晓风 李哲 吴文矛 李巨浩[1] 任芳 Li Xiaofeng;Li Zhe;Wu Wenmao;Li Juhao;Ren Fang(State Key Laboratory of Advanced Optical Communication Systems and Networks,Peking University,Beijing 100871,China;Institute of Deep-Sea Science and Engineering,Chinese Academy of Sciences,Sanya,Hainan 572000,China;School of Computer and Communication Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京大学区域光纤通信网与新型光纤通信系统国家重点实验室,北京100871 [2]中国科学院深海科学与工程研究所,海南三亚572000 [3]北京科技大学计算机与通信工程学院,北京100083

出　　处：《光学学报》2020年第14期40-45,共6页Acta Optica Sinica

基　　金：中央高校基本科研业务费(FRF-TP-19-016A2)。

摘　　要：设计一种基于腔内全光纤模式复用器/解复用器(MUX/DEMUX)的少模环形光纤激光器,实现了LP01模、LP11模、LP21模及混合模式可切换的激光输出。实验结果表明,利用低串扰的全光纤模式MUX/DEMUX结合4×1光开关,激光器可在三个最低阶的线偏振(LP)模式及其混合模式之间进行切换,LP01模、LP11模、LP21模的泵浦阈值分别为40、60、80 mW,斜率效率分别为1.2%、0.82%、0.56%。对设计的少模环形光纤激光器结构进行数值模拟和参数优化,极大地改善了波长偏移问题,实现了小于0.032 nm的3 dB线宽。A few-mode ring fiber laser based on an all-fiber mode multiplexer/demultiplexer(MUX/DEMUX)was designed,which achieved switchable lasing output in LP01,L P11,LP21,and hybrid modes.Experimental results show that the output lasing mode of the ring fiber laser can be switched between the three lowest-order linearly polarized(LP)modes and hybrid modes by employing a low mode-crosstalk all-fiber mode MUX/DEMUX and a simple 4×1 optical switch.Thresholds of 40,60,and 80 mW and slope efficiencies of 1.2%,0.82%,and 0.56%were obtained for the LP01,LP11,and LP21 mode operations,respectively.Numerical simulation and parameter optimization of the designed few-mode ring fiber laser structure adequately resolved the wavelength shift problem,with a line width of 3 dB less than 0.032 nm being realized.

关 键 词：光纤光学 光纤激光器 模式复用器/解复用器 模式转换 模式选择耦合器 

分 类 号：TN248[电子电信—物理电子学]