Fiber-based mode converter for generating optical vortex beams

被引：23
|
作者：
Chen, Ruishan [1 ]
Wang, Jinghao [1 ]
Zhang, Xiaoqiang [1 ,2 ]
Yao, Junna [1 ]
Ming, Hai [1 ]
Wang, Anting [1 ]
机构：
[1] Univ Sci & Technol China, Dept Opt & Opt Engn, Hefei 230026, Peoples R China
[2] Hefei Gen Machinery Res Inst, Hefei 230031, Peoples R China
来源：
OPTO-ELECTRONIC ADVANCES | 2018年 / 1卷 / 07期
基金：
中国国家自然科学基金;
关键词：
optical vortices; fiber optics; singular optics; mode-division multiplexing; ORBITAL ANGULAR-MOMENTUM; GAUSSIAN-BEAM; LIGHT;
D O I：
10.29026/oea.2018.180003
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this work, an all-fiber-based mode converter for generating orbital angular momentum (OAM) beams is proposed and numerically investigated. Its structure is constructed by cascading a mode selective coupler (MSC) and an inner elliptical cladding fiber (IECF). OAM modes refer to a combination of two orthogonal LP(lm )modes with a phase difference of +/-pi/2. By adjusting the parameters and controlling the splicing angle of MSC and IECF appropriately, higher-order OAM modes with topological charges of l = +/- 1, +/- 2, +/- 3 can be obtained with the injection of the fundamental mode LP01, resulting in a mode-conversion efficiency of almost 100%. This achievement may pave the way towards the realization of a compact, all-fiber, and high-efficiency device for increasing the transmission capacity and spectral efficiency in optical communication systems with OAM mode multiplexing.
引用
收藏
页码：1 / 7
页数：7
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