Tunable Filtering of Orbital Angular Momentum Modes via Spatial Depth-Dependent Mode Transformation  

作　　者：Haisheng Wu Huihua Huang Shu Chen Jing Wang Qingji Zeng Bowei Zhang Junmin Liu Huapeng Ye Ze Dong Dianyuan Fan Shuqing Chen 吴海生;黄辉华;陈舒;王晶;曾庆计;张博维;刘俊敏;叶华朋;董泽;范滇元;陈书青(Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518000,China;College of New Materials and New Energies,Shenzhen Technology University,Shenzhen 518118,China;School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;South China Academy of Advanced Optoelectronics,South China Normal University,Guangzhou 510006,China)

机构地区：[1]Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518000,China [2]College of New Materials and New Energies,Shenzhen Technology University,Shenzhen 518118,China [3]School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China [4]South China Academy of Advanced Optoelectronics,South China Normal University,Guangzhou 510006,China

出　　处：《Chinese Physics Letters》2024年第12期78-89,共12页中国物理快报（英文版）

摘　　要：Advancements in orbital angular momentum (OAM) mode-multiplexing communication networks requiretunable mode filters for selective channel demultiplexing and downloading. In this study, we propose a spatialdepth-dependent mode transformation strategy for the tunable filtering of OAM modes. By integrating the spiralphase and lens phase modulations, we achieved mode conversions that varied with the transmission depth,enabling selective demultiplexing in predetermined axial planes. This approach facilitates tunable mode filteringby adjusting spatial depths. As a proof of concept, we fabricated a mode filter using two-photon polymerizationlithography (TPL) technology, successfully filtering five OAM modes with mode crosstalk below −10.9 dB.Additionally, the filter was applied in a mode-multiplexing communication link, achieving tunable demultiplexingof five mode channels with bit error rates below 10^(−6). These results highlight the efficacy and flexibilityof our strategy for OAM mode filtering and offer promising insights for the development of mode-multiplexingcommunication networks and channel interconnections.

关 键 词：TUNABLE INTERCONNECTION LITHOGRAPHY 

分 类 号：TN929.1[电子电信—通信与信息系统]