首页|Tunable Filtering of Orbital Angular Momentum Modes via Spatial Depth-Dependent Mode Transformation
Tunable Filtering of Orbital Angular Momentum Modes via Spatial Depth-Dependent Mode Transformation
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Advancements in orbital angular momentum(OAM)mode-multiplexing communication networks require tunable mode filters for selective channel demultiplexing and downloading.In this study,we propose a spatial depth-dependent mode transformation strategy for the tunable filtering of OAM modes.By integrating the spi-ral phase 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 filtering by adjusting spatial depths.As a proof of concept,we fabricated a mode filter using two-photon polymeriza-tion lithography(TPL)technology,successfully filtering five OAM modes with mode crosstalk below-10.9dB.Additionally,the filter was applied in a mode-multiplexing communication link,achieving tunable demultiplex-ing of five mode channels with bit error rates below 10-6.These results highlight the efficacy and flexibility of our strategy for OAM mode filtering and offer promising insights for the development of mode-multiplexing communication networks and channel interconnections.
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
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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
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