Fiber-based mode converter for generating optical vortex beams  

作　　者：Ruishan Chen Jinghao Wang Xiaoqiang Zhang Junna Yao Hai Ming Anting Wang 

机构地区：[1]Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China [2]Hefei General Machinery Research Institute, Hefei 230031, China

出　　处：《Opto-Electronic Advances》2018年第7期1-7,共7页光电进展（英文）

基　　金：This work was supported by National Natural Science Foundation of China （Grant No. 61275049）.

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 LPlm modes with a phase difference of ±π/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.

关 键 词：optical vortices fiber optics singular optics mode-division multiplexing 

分 类 号：TN29[电子电信—物理电子学]