Recent Advances in Optical Turbulence

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: 30 October 2024 | Viewed by 2684

Special Issue Editors

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
Interests: optical wireless communications; RF communications; Signal detection; MIMO technique; resource allocation; deep learning; reinforcement learning
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Guest Editor
School of Information and Communication Engineering, Dalian University of Technology, Dalian 116024, China
Interests: VLC positioning; GNSS; indoor positioning; seamless positioning

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Guest Editor
1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
Interests: adaptive optics; anti-turbulence techniques; optical turbulence

Special Issue Information

Dear Colleagues,

Refractive index fluctuations can lead to irradiance fluctuations, beam spreading, and a loss of spatial coherence of an optical wave, among other effects, which is known as optical turbulence. Optical turbulence is caused by wind blowing over an aerodynamically rough region of the Earth’s surface in the presence of a temperature gradient. Unfortunately, these detrimental effects have far-reaching consequences for astronomical imaging, free-space optical communications, remote sensing, laser radar, and other applications that require the transmission of optical waves through the atmosphere. Therefore, there is a need to study optical turbulence. We believe that advances in these research fields will push this technology forward.

This Special Issue will cover a range of topics from the field, including, but not limited to, the following:

  • Theoretical and experimental results of optical turbulence;
  • Novel models of optical turbulence or refractive index structure parameter C_n^2;
  • Non-Kolmogorov spectra of optical turbulence;
  • Power fluctuations or phase distortions caused by optical turbulence;
  • Adaptive optics and other turbulence mitigation techniques;
  • Simulation of optical turbulence;
  • Optical turbulence’s effect on imaging, free-space optical communications, remote sensing, laser radar, positioning, quantum communications, and other applications;
  • Underwater turbulence.

Dr. Yatian Li
Dr. Deyue Zou
Dr. Kainan Yao
Guest Editors

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Keywords

  • optical turbulence
  • atmospheric turbulence
  • underwater turbulence
  • adaptive optics
  • turbulence mitigation
  • turbulence simulation
  • refractive index structure parameter
  • greenwood frequency
  • Taylor frequency
  • seeing

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Published Papers (2 papers)

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Research

12 pages, 2853 KiB  
Article
Research on Mitigating Atmosphere Turbulence Fading by Relay Selections in Free-Space Optical Communication Systems with Multi-Transceivers
by Xiaogang San, Zuoyu Liu and Ying Wang
Photonics 2024, 11(9), 847; https://doi.org/10.3390/photonics11090847 - 6 Sep 2024
Viewed by 474
Abstract
In free-space optical communication (FSOC) systems, atmospheric turbulence can bring about power fluctuations in receiver ends, restricting channel capacity. Relay techniques can divide a long FSOC link into several short links to mitigate the fading events caused by atmospheric turbulence. This paper proposes [...] Read more.
In free-space optical communication (FSOC) systems, atmospheric turbulence can bring about power fluctuations in receiver ends, restricting channel capacity. Relay techniques can divide a long FSOC link into several short links to mitigate the fading events caused by atmospheric turbulence. This paper proposes a Reinforcement Learning-based Relay Selection (RLRS) method based on Deep Q-Network (DQN) in a FSOC system with multiple transceivers, whose aim is to enhance the average channel capacity of the system. Malaga turbulence is studied in this paper. The presence of handover loss is also considered. The relay nodes serve in decode-and-forward (DF). Simulation results demonstrate that the RLRS algorithm outperforms the conventional greedy algorithm, which implies that the RLRS algorithm may be utilized in practical FSOC systems. Full article
(This article belongs to the Special Issue Recent Advances in Optical Turbulence)
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15 pages, 6603 KiB  
Article
Design and Experimental Demonstration of an Atmospheric Turbulence Simulation System for Free-Space Optical Communication
by Lin Li, Ning Ji, Zhiyong Wu and Jiabin Wu
Photonics 2024, 11(4), 334; https://doi.org/10.3390/photonics11040334 - 3 Apr 2024
Cited by 1 | Viewed by 1596
Abstract
In this paper, the design of an atmospheric turbulence simulation system for free-space optical (FSO) communication is proposed. The system can accurately simulate repeatable atmospheric turbulent fading channels. It has a dynamic execution range of 30 dB with an execution rate of 1 [...] Read more.
In this paper, the design of an atmospheric turbulence simulation system for free-space optical (FSO) communication is proposed. The system can accurately simulate repeatable atmospheric turbulent fading channels. It has a dynamic execution range of 30 dB with an execution rate of 1 MHz. The execution accuracy of the system is higher than 0.1 dB. In addition, the reliable TCP/IP protocol is used for communication, which ensures the convenience and versatility of the system. Experiments are carried out to investigate the performance of the system, and the results prove its superiority. Hence, the atmospheric turbulence simulation system can effectively simulate the influence of atmospheric turbulence channels on FSO communication systems. Full article
(This article belongs to the Special Issue Recent Advances in Optical Turbulence)
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