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Chin. Phys. B, 2021, Vol. 30(10): 104208    DOI: 10.1088/1674-1056/abefc9

Generation of a large orbital angular momentum beam via an optical fiber winding around a curved path and its application

Wei-Han Tan(谭维翰)1, Chao-Ying Zhao(赵超樱)2,3,†, Yi-Chao Meng(孟义朝)4, and Qi-Zhi Guo(郭奇志)1
1 Department of Physics, Shanghai University, Shanghai 200444, China;
2 College of Science, Hangzhou Dianzi University, Hangzhou 310018, China;
3 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China;
4 Institute of Fiber Optics, Shanghai University, Shanghai 200444, China
Abstract  Many papers have been published on the study of orbital angular momentum (OAM) of the laser modes based on the Laguerre-Gaussian (LG) beam and helical phase plate or rotating cylindrical lens, and the principal ray of the LG beam remains straight line. These ways are difficult to get a large OAM modes. In this paper, we propose a novel method to prepare a large OAM modes when the light propagates through a optical fiber winding around a curved path, and establish a theoretical framework based on the principal ray path changing. Firstly, we investigate three kinds of winding structure. Secondly, based on the analytical solutions and numerical calculations, we can find that the spiral body can achieve a large OAM temporal pulse. At the same time, based on the zero OAM diffraction diagram, we can obtain an improvement of resolving power beyond Rayleigh's criterion. Finally, applying a large OAM diffraction pattern to realize 12-bitencodes, we can obtain a high-security optical information transfer system.
Keywords:  fiber optics      orbital angular momentum (OAM)      differential Fernet equation      Rayleigh criterion  
Received:  07 January 2021      Revised:  11 March 2021      Accepted manuscript online:  18 March 2021
PACS:  42.81.Qb (Fiber waveguides, couplers, and arrays)  
  42.50.Tx (Optical angular momentum and its quantum aspects)  
  02.40.-k (Geometry, differential geometry, and topology)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11504074) and the State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University (Grant No. KF202004).
Corresponding Authors:  Chao-Ying Zhao     E-mail:

Cite this article: 

Wei-Han Tan(谭维翰), Chao-Ying Zhao(赵超樱), Yi-Chao Meng(孟义朝), and Qi-Zhi Guo(郭奇志) Generation of a large orbital angular momentum beam via an optical fiber winding around a curved path and its application 2021 Chin. Phys. B 30 104208

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