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Free-space Optical Communication based on Augmentation of OAM Modes
- Study on Optical Communications Issue 4, (2025)
- 作者机构：
1.清华大学 深圳国际研究生院，广东 深圳 518055
2.清华大学 电子工程系，北京 100084
- 作者简介：
- 基金信息：
DOI：10.13756/j.gtxyj.2025.250021
CLC： TN929Received：19 January 2025，
Revised：04 March 2025，
Published：10 August 2025
- 稿件说明：
移动端阅览
戴炜杰，苏晓凤，刘晓谦，等. OAM模式增广的自由空间光通信[J]. 光通信研究，2025(4): 250021.
Dai W J, Su X F, Liu X Q, et al. Free-space Optical Communication based on Augmentation of OAM Modes[J]. Study on Optical Communications, 2025(4): 250021.
戴炜杰，苏晓凤，刘晓谦，等. OAM模式增广的自由空间光通信[J]. 光通信研究，2025(4): 250021. DOI： 10.13756/j.gtxyj.2025.250021.
Dai W J, Su X F, Liu X Q, et al. Free-space Optical Communication based on Augmentation of OAM Modes[J]. Study on Optical Communications, 2025(4): 250021. DOI： 10.13756/j.gtxyj.2025.250021.
摘要
【目的】
2
大气和海洋湍流会导致光学轨道角动量（OAM）的模式扩散，是造成OAM自由空间光通信（FSOC）系统性能恶化的主要因素之一。抑制湍流效应是OAM-FSOC领域研究人员长期以来追求的目标。
【方法】
2
在基于OAM模式的大容量光无线通信背景下，湍流导致OAM谱发生对称扩散，传统的湍流抑制方案需要复杂的波前感知和合并方案。而部分相干光场中扭曲相位和涡旋相位的共存会导致OAM谱具有非对称的扩散行为，为抑制湍流提供了新的切入点。文章强调了这种非对称OAM谱启发的信息传输范式转变，旨在利用扭曲因子造成的可控OAM非对称性扩散进行模式增广，并基于此制定新的发射端模式编码与接收端模式合并方案。
【结果】
2
文章所提方案给OAM-FSOC系统的平均容量、聚合容量和误码率（BER）方面的性能带来了显著提升。数值结果显示了与理论预测一致的显著性能提升，包括湍流信道中的实际容量、容量上限、可用链路距离以及抑制湍流的能力。
【结论】
2
文章所提方案不仅是扭曲部分相干光场在OAM-FSOC系统中的应用，也是对OAM谱的可控非对称扩散这一物理事实的利用。文章展示了以扭曲相位部分相干光场调控为例的光波物理前沿理论在下一代光无线通信中的重要应用潜力。
Abstract
【Objective】
2
Atmospheric and oceanic turbulence causes the mode fading of optical Orbital Angular Momentum (OAM)
thus being one of the main factors that deteriorate the performance of OAM-based Free-Space Optical Communications (FSOC) systems. Anti-turbulence effect has long been a pursuit of researchers in the field of OAM-FSOC.
【Methods】
2
In the context of high-capacity optical wireless communication based on the OAM mode
turbulence causes symmetric diffusion of the OAM spectrum. Traditional turbulence mitigation schemes require complex wavefront sensing and combining solutions. However
in a partially coherent light field
the coexistence of twisted phase and vortex phase leads to an asymmetric diffusion behavior of the OAM spectrum
providing a new approach for turbulence mitigation. This work highlights the paradigm shift of information transmission inspired by asymmetrical OAM spectra
aiming to utilize the controllable asymmetry caused by the twist factor for mode augmentation. Based on this
we further propose novel mode encoding scheme at the transmitter and mode combining scheme at the receiver. The proposed schemes bring significant improvements in terms of the average capacity
aggregate capacity
and Bit Error Rate (BER) of OAM-FSOC systems.
【Results】
2
Numerical results show significant performance improvements consistent with theoretical predictions
including the actual capacity
capacity upper bound
and available link distance in turbulent channels
as well as the ability to suppress turbulence.
【Conclusion】
2
The proposed solution in the paper is not only the application of twisted partially coherent light fields in OAM-FSOC systems but also the utilization of the physical fact of controllable asymmetric diffusion of the OAM spectrum. The paper demonstrates the significant potential for the application of cutting-edge optical wave physics theories
exemplified by the regulation of twisted phase partially coherent light fields
in next-generation optical wireless communications.
关键词
Keywords
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