光学旋涡与轨道角动量光通信  

Optical vortices and optical communication with orbital angular momentum

作　　者：袁小聪[1] 贾平[2] 雷霆[1] 张萌[2] 闵长俊[1] 李玉茹[3] 李朝晖[3] 牛憨笨[1] 

机构地区：[1]深圳大学光电工程学院,光电子器件与系统教育部/广东省重点实验室,深圳518060 [2]南开大学现代光学研究所,光电信息技术科学教育部重点实验室,天津300071 [3]暨南大学光子技术研究所,广州510632

出　　处：《深圳大学学报（理工版）》2014年第4期331-346,共16页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(61036013,61138003)~~

摘　　要：光学旋涡(optical vortices,OV)光束包含螺旋型相位因子,具有全新的自由度——轨道角动量(orbital angular momentum,OAM).OAM本征值为l,且理论上拓扑荷l可取任意整数,这为光学旋涡在光通信系统中的各种应用提供基础.目前有很多方法可用于光学旋涡的产生与检测,而光学旋涡在光通信系统中的应用也正是基于这些方法.OAM在自由空间光通信系统中的应用机制可分为OAM键控(OAM状态作为调制方式)和OAM复用(OAM光束作为复用信道).针对这两种机制已展开大量的理论研究和实验探索,认为光学旋涡可为丰富自由空间光通信系统的调制方式和增加传输容量提供潜在的解决方案.光学旋涡光束的OAM和角向位置的不确定性关系也为之带来了与生俱来的安全优势.光学旋涡的独有特性为光通信系统的性能改善提供了巨大潜力.An optical vortices （OV） beam with a helical phase term shows a new degree of freedom, namely orbital angular momentum （0AM）. The eigenvalue of OAM is lh , and the topological charge I can be any integer in principle, which offers the basis for various applications of OV in optical communication system. There are many approaches so far for the generation and detection of OV on which the applications of OV in optical communication are based. The application mechanisms of OAM in free-space optical communication （FSO） system can be classified into two different categories： one is OAM shift keying （OAM-SK） where OAM states play as modulation formats; the other is OAM division multiplexing （OAM-DM） where OAM beams play as multiplexing channels. For these two mechanisms, there has been mass theoretical researches and experimental explorations.OV offer potential solutions for enriching the modulation formats or increasing the transmission capacity of FSO system. Furthermore, the uncertainty relationship between OAM and angular position of OV beams also brings about inherent security advantage. These characteristics of OV can provide great potential to improve the performances of OAM-embedded FSO communication system.

关 键 词：光通信技术 光学旋涡 轨道角动量 自由空间光通信 复用 调制 不确定原理 通信容量 误码率 

分 类 号：TN929.1[电子电信—通信与信息系统]