Transverse mode multiplexing using the helical eigen-beams of orbital angular momentum |
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| Authors: | Yi-Dong Liu Chunqing Gao Xuenan Wang Huajun Yang |
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| Institution: | 1. School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China;2. School of Opto-Electronics, Beijing Institute of Technology, Beijing 100081, China;1. Los Alamos National Laboratory, MPA-11, Sensors & Electrochemical Devices, Acoustics & Sensors Technology Team, MS D429, Los Alamos, NM 87545, USA;2. Laboratoire de Mécanique et d’Acoustique, CNRS-UPR 7051, 31 chemin Joseph Aiguier, Marseille 13402, France;1. School of Mathematics & Physics, Changzhou University, Changzhou 213164, China;2. School of Sciences, Hunan University of Technology, Zhuzhou 412008, China;1. Medical Thoracic Oncology Unit, IRCCS Istituto Tumori “Giovanni Paolo II”, Bari, Italy;2. Division of Internal Medicine, Clinica Medica “Augusto Murri”, Department of Biomedical Sciences and Human Oncology, University of Bari Medical School, Piazza Giulio Cesare, 11, 70124, Bari, Italy |
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| Abstract: | The eigen-beams of orbital angular momentum (OAM) have helical wavefront and can be used to construct the channels for free space optical communication, i.e. orbital angular momentum multiplexing (OAMM). It is similar to time-division multiplexing (TDM) and wave-division multiplexing (WDM). We generate four helical beams with different OAM numbers by fork-like grating and modulates them mechanically. The modulated helical beams are then superposed coaxially into one single complex beam. In the receiver, the complex beam is separated into four helical beams with little mutual interference. The experimental results demonstrate the feasibility of OAMM by using the eigen-beams of orbital angular momentum. |
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