All-fiber third-order orbital angular momentum mode generation employing an asymmetric long-period fiber grating

被引:48
作者
He, Xiaodong [1 ,2 ]
Tu, Jiajing [3 ]
Wu, Xiaowen [3 ]
Gao, Shecheng [3 ]
Shen, Lei [4 ]
Hao, Chenglong [5 ]
Feng, Yuanhua [3 ,7 ]
Liu, Weiping [3 ]
Li, Zhaohui [1 ,2 ,6 ]
机构
[1] Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Peoples R China
[2] Sun Yat Sen Univ, Sch Elect & Informat Technol, Guangzhou 510275, Peoples R China
[3] Jinan Univ, Coll Informat Sci & Technol, Dept Elect Engn, Guangzhou 510632, Peoples R China
[4] Yangtze Opt Fiber & Cable Joint Stock Ltd Co, State Key Lab Opt Fiber & Cable Manufacture Techn, Wuhan 430073, Peoples R China
[5] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117583, Singapore
[6] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519000, Peoples R China
[7] Chinese Acad Sci, Inst Semicond, State Key Lab Integrated Optoelect, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
D O I
10.1364/OL.394333
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The third-order orbital angular momentum (OAM(+/- 3)) guided mode generation is demonstrated for the first time, to the best of our knowledge, by employing an asymmetric long-period fiber grating (AS-LPFG). The proposed AS-LPFG is modeled by coupled local-mode theory, which is extended to the coupling of core modes and is fabricated by multicycle scanning ablation with increasing power in a six-mode fiber. The experiments demonstrate that one fabricated AS-LPFG can convert the LP01 mode to the third-azimuthal-order (3AO, LP31 or OAM(+/- 3)) guided mode with efficiency of similar to 99.8%. The model and the method presented, in principle, can be used to generate any other high-order modes. (C) 2020 Optical Society of America
引用
收藏
页码:3621 / 3624
页数:4
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