Time Evolution of Orbital Angular Momentum Modes for Deep-Routing Multiplexing Channels  

作　　者：Zebin Huang Peipei Wang Jiafu Chen Wenjie Xiong Huapeng Ye Xinxing Zhou Ze Dong Dianyuan Fan Shuqing Chen 

机构地区：[1]Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China [2]School of Physics and Electronic Information,Huaibei Normal University,Huaibei 235000,China [3]Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute of Electronic Paper Displays,South China Academy of Advanced Optoelectronics,South China Normal University,Guangzhou 510006,China [4]Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of the Ministry of Education,Synergetic Innovation Center for Quantum Effects and Applications,School of Physics and Electronics,Hunan Normal University,Changsha 410081,China [5]School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Engineering》2025年第2期97-104,共8页工程(英文)

基　　金：the National Natural Science Foundation of China(62271322);the Guangdong Basic and Applied Basic Research Foundation(2022A1515011003 and 2023A1515030152);the Shenzhen Science and Technology Program(JCYJ20210324095610027 and JCYJ20210324095611030).

摘　　要：Optical orbital angular momentum(OAM)mode multiplexing has emerged as a promising technique for boosting communication capacity.However,most existing studies have concentrated on channel(de)-multiplexing,overlooking the critical aspect of channel routing.This challenge involves the reallocation of multiplexed OAM modes across both spatial and temporal domains—a vital step for developing versatile communication networks.To address this gap,we introduce a novel approach based on the time evolution of OAM modes,utilizing the orthogonal conversion and diffractive modulation capabilities of unitary transformations.This approach facilitates high-dimensional orthogonal transformations of OAM mode vectors,altering both the propagation direction and the spatial location.Using Fresnel diffraction matrices as unitary operators,it manipulates the spatial locations of light beams during transmission,breaking the propagation invariance and enabling temporal evolution.As a demonstration,we have experimentally implemented the deep routing of four OAM modes within two distinct time sequences.Achieving an average diffraction efficiency above 78.31%,we have successfully deep-routed 4.69 Tbit-s^(-1)quadrature phase-shift keying(QPSK)signals carried by four multiplexed OAM channels,with a bit error rate below 10^(-6).These results underscore the efficacy of our routing strategy and its promising prospects for practical applications.

关 键 词：Orbital angular momentum Time evolution modulation Deep-routing technology Unitary transformation Mode-division communication networks 

分 类 号：O43[机械工程—光学工程] TN929.1[理学—光学]