Multiplexing and Demultiplexing of Aperture-Modulated OAM Beams

作者：W. Wang, Liguo Wang, Lei Gong, Zhiqiang Yang, Lihong Yang, Yao Li, Zhensen Wu · 发表于：Sensors · 年份：2025 · DOI：10.3390/s25134229 · 被引用次数：2 · 研究领域：Orbital Angular Momentum in Optics、Near-Field Optical Microscopy、Microfluidic and Bio-sensing Technologies

A multiplexing method for orbital angular momentum (OAM) beams was proposed. The aperture size as a new information carrier was provided, and it could be modulated by the external variable aperture. The field of the beams propagating through turbulence was derived and discretized with Gauss-Legendre quadrature formulas. Based on this, the demultiplexing method was improved, and the beam OAM states, amplitude, Gaussian spot radius and aperture radius were decoded. Moreover, the influence of turbulence on the multiplexing parameters was also analyzed, and the decoding precision of the aperture radius was higher than that of other parameters. The aperture radius was recommended as an extra carrier for multiplexing communication. This study provides a simple method to modulate the information carried by OAM beams, and it has promising applications in large capacity laser communication.