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Advances in Condensed Matter Physics
Volume 2017, Article ID 6293910, 9 pages
https://doi.org/10.1155/2017/6293910
Research Article

Optical Orbital Angular Momentum Demultiplexing and Channel Equalization by Using Equalizing Dammann Vortex Grating

International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China

Correspondence should be addressed to Shuqing Chen; nc.ude.uzs@nehcgniquhs

Received 21 April 2017; Accepted 23 May 2017; Published 21 June 2017

Academic Editor: Ashok Chatterjee

Copyright © 2017 Mingyang Su et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel equalizing Dammann vortex grating (EDVG) is proposed as orbital angular momentum (OAM) multiplexer to realize OAM signal demultiplexing and channel equalization. The EDVG is designed by suppressing odd diffraction orders and adjusting the grating structure. The light intensity of diffraction is subsequently distributed evenly in the diffraction orders, and the total diffraction efficiency can be improved from 53.22% to 82%. By using the EDVG, OAM demultiplexing and channel equalization can be realized. Numerical simulation shows that the bit error rate (BER) of each OAM channel can decrease to when the bit SNR is 22 dB, and the intensity is distributed over the necessary order of diffraction evenly.