Statistical Recognition of OAM States in Free-Space Optical System

IF 2.1 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Photonics Journal Pub Date : 2024-06-07 DOI:10.1109/JPHOT.2024.3410931

Qinnan Zhu;Guowei Yang;Zhiyu Yuan;Meihua Bi;Xuefang Zhou;Miao Hu

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Abstract

The orbital angular momentum (OAM) states are used for OAM modulation and OAM multiplexing in free-space optical (FSO) communication systems to enhance the transmission quality and capacity. Although a few impactful methods had been developed to measure static OAM states, the fast and accurate recognition of dynamic OAM states in FSO communications remains a challenge due to the OAM crosstalk easily induced by the atmospheric turbulence. In this paper, we present a new simple statistical recognition method realized by utilizing the turbulence-induced crosstalk distribution, other than the routine way to use the spatial intensity patterns. The proposed method is based on acquiring the priori OAM crosstalk distribution of the training optical data, and then using similarity analysis to recognize the OAM states of the information optical data. Its availability and accuracy are validated through the computer simulations. The recognition accuracy under relatively strong turbulence conditions can be improved by using wavefront compensation and specific distance calculation.

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自由空间光学系统中 OAM 状态的统计识别

轨道角动量（OAM）状态用于自由空间光学（FSO）通信系统中的OAM调制和OAM复用，以提高传输质量和容量。尽管已经开发出了一些有影响力的方法来测量静态 OAM 状态，但由于大气湍流容易引起 OAM 串扰，在 FSO 通信中快速准确地识别动态 OAM 状态仍然是一项挑战。本文提出了一种新的简单统计识别方法，它利用了湍流引起的串扰分布，而不是使用空间强度模式的常规方法。该方法基于获取训练光学数据的先验 OAM 串扰分布，然后使用相似性分析来识别信息光学数据的 OAM 状态。计算机模拟验证了该方法的可用性和准确性。在相对较强的湍流条件下，利用波前补偿和特定距离计算可以提高识别精度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Journal ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS

CiteScore

4.50

自引率

8.30%

发文量

489

审稿时长

1.4 months

期刊介绍： Breakthroughs in the generation of light and in its control and utilization have given rise to the field of Photonics, a rapidly expanding area of science and technology with major technological and economic impact. Photonics integrates quantum electronics and optics to accelerate progress in the generation of novel photon sources and in their utilization in emerging applications at the micro and nano scales spanning from the far-infrared/THz to the x-ray region of the electromagnetic spectrum. IEEE Photonics Journal is an online-only journal dedicated to the rapid disclosure of top-quality peer-reviewed research at the forefront of all areas of photonics. Contributions addressing issues ranging from fundamental understanding to emerging technologies and applications are within the scope of the Journal. The Journal includes topics in: Photon sources from far infrared to X-rays, Photonics materials and engineered photonic structures, Integrated optics and optoelectronic, Ultrafast, attosecond, high field and short wavelength photonics, Biophotonics, including DNA photonics, Nanophotonics, Magnetophotonics, Fundamentals of light propagation and interaction; nonlinear effects, Optical data storage, Fiber optics and optical communications devices, systems, and technologies, Micro Opto Electro Mechanical Systems (MOEMS), Microwave photonics, Optical Sensors.