光子学报 ›› 2018, Vol. 47 ›› Issue (9): 905002-0905002.doi: 10.3788/gzxb20184709.0905002

• 衍射与光栅 • 上一篇    下一篇

轨道角动量分离系统中纯相位型扇出光栅的设计

尹霄丽, 廖焕宇, 王拥军, 常欢, 崔小舟, 林娇玲   

  1. 北京邮电大学 电子工程学院 天地互联与融合北京市重点实验室, 北京 100876
  • 收稿日期:2018-04-16 出版日期:2018-09-25 发布日期:2018-05-31
  • 作者简介:尹霄丽(1970-),女,副教授,博士,主要研究方向为无线光通信.Email:yinxl@bupt.edu.cn
  • 基金资助:

    国家自然科学基金(No.61575027)和北京邮电大学博士创新基金(Nos.CX2018212,CX2018213)资助

Design for the Phase-only FAN-OUT Grating of Orbital Angular Momentum Separation System

YIN Xiao-li, LIAO Huan-yu, WANG Yong-jun, CHANG Huan, CUI Xiao-zhou, LIN Jiao-ling   

  1. Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2018-04-16 Online:2018-09-25 Published:2018-05-31
  • Contact: 2018-05-31
  • Supported by:

    The National Natural Science Foundation of China (No. 61575027), BUPT Excellent Ph.D. Students Foundation (Nos.CX2018212, CX2018213)

摘要:

基于坐标变换的轨道角动量光束分离技术,提出一种基于迭代算法的纯相位型扇出光栅设计方法,实现光束复制,以提高输出光斑的分辨率.建立轨道角动量光束的高分辨率分离系统的数值仿真模型.数值结果表明,加入该方法设计得到的纯相位型扇出光栅后,系统接收到的光斑能量更加集中,轨道角动量螺旋谱的弥散程度至少下降了0.35,错误概率下降了15%以上,有利于系统实现高分辨率的轨道角动量光束分离.

关键词: 坐标变换, 扇出, 分离, 轨道角动量, 纯相位

Abstract:

Based on the coordinate-transformation Orbital Angular Momentum (OAM) sorting scheme, this paper designs a phase-only FAN-OUT grating using a method based on iterative algorithm to copy beams and improve the resolution of the OAM beams sorting efficiently. This paper establishes a numerical simulation model for high-resolution sorting of OAM beams. Numerical results indicate that the energy in the spot received by the system with phase-only FAN-OUT grating is more concentrate and the minimum reduction of dispersion degree of the OAM spectrum is 0.35, the minimum reduction of the error probability is 15%. The phase-only FAN-OUT grating is advantageous for realizing high-resolution sorting of OAM beams.

Key words: Fan-out, Coordinate transformation, Phase-only, Orbital angular momentum, Sorting

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