Next-Generation Free-Space Optical Communication Technologies

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optical Communication and Network".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 1704

Special Issue Editors


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Guest Editor
School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Interests: space communication; satellite optical communication; ultraviolet optical communication; underwater optical communication; optical receivers; optimal quantum detection; quantum detection in classical and quantum optical communications

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Guest Editor
School of Optoelectronics, Beijing Institute of Technology, Beijing, China
Interests: free-space optical communications; the design of communication circuits; the modeling and simulation of light propagation in complex environments; coherent detection

Special Issue Information

Dear Colleagues,

Free-space optical (FSO) communication has attracted increasing attention due to its advantages of high bandwidth, license-free spectrum, flexible deployment, cost-effectiveness, and immunity to electromagnetic interference. In recent years, various theoretical and experimental results on FSO communication technologies have been reported for terrestrial links, underwater links, inter-satellite links, satellite-to-ground links, and other fixed/mobile links among unmanned aerial vehicles, high-altitude airships, etc. However, practical implementations of FSO communications encountered challenges, such as high path losses, due to the scattering and absorption effects in terrestrial and underwater links, turbulent fluctuations in underwater and satellite-to-ground links, the requirement of efficient pointing, acquisition, and tracking systems in inter-satellite and satellite-to-ground links, among other things.

This Special Issue on “Next-Generation Free-Space Optical Communication Technologies” will welcome basic, methodological, and applied cutting-edge research contributions on the following topics:

  • Channel modeling for complex atmospheric conditions in FSO communications;
  • Modulation and coding techniques designed for FSO communication channels;
  • High-performance optical detection techniques under weak links;
  • Experimental demonstrations of FSO communication systems;
  • High-precision pointing, acquisition, and tracking techniques for FSO links;
  • Networking for next-generation FSO communications;
  • Underwater optical communications or ultraviolet communications.

Dr. Renzhi Yuan
Dr. Haifeng Yao
Guest Editors

Manuscript Submission Information

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Keywords

  • free-space optical communication
  • atmospheric turbulence
  • underwater turbulence
  • optical scattering and absorption
  • optical detection techniques
  • optical modulation and coding techniques
  • satellite optical communications
  • underwater optical communications
  • ultraviolet communications
  • optical networking

Published Papers (2 papers)

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Research

13 pages, 2993 KiB  
Article
Adaptive Modulation Scheme for Soft-Switching Hybrid FSO/RF Links Based on Machine Learning
by Junhu Shao, Yishuo Liu, Xuxiao Du and Tianjiao Xie
Photonics 2024, 11(5), 404; https://doi.org/10.3390/photonics11050404 - 26 Apr 2024
Viewed by 536
Abstract
A hybrid free-space optical (FSO) and radio frequency (RF) communication system has been considered an effective way to obtain a good trade-off between spectrum utilization efficiency and high-rate transmission. Utilizing artificial intelligence (AI) to deal with the switching and rate adaption problems between [...] Read more.
A hybrid free-space optical (FSO) and radio frequency (RF) communication system has been considered an effective way to obtain a good trade-off between spectrum utilization efficiency and high-rate transmission. Utilizing artificial intelligence (AI) to deal with the switching and rate adaption problems between FSO/RF links, this paper investigated their modulation adapting mechanism based on a machine learning (ML) algorithm. Hybrid link budgets were estimated for different modulation types in various environments, particularly severe weather conditions. For the adaptive modulation (AM) scheme with different order PPM/PSK/QAM, a rate-compatible soft-switching model for hybrid FSO/RF links was established with a random forest algorithm based on ML. With a given target bit error rate, the model categorized a link budget threshold of the hybrid FSO/RF system over a training data set from local weather records. The switching and modulation adaption accuracy were tested over the testing weather data set especially focusing on rain and fog. Simulation results show that the proposed adaptive modulation scheme based on the random forest algorithm can have a good performance for soft-switching hybrid FSO/RF communication links. Full article
(This article belongs to the Special Issue Next-Generation Free-Space Optical Communication Technologies)
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10 pages, 8597 KiB  
Communication
Line-of-Sight Initial Pointing Model of Space Dynamic Optical Network and Its Verification
by Shu Chen, Xin Zhao, Xiaoying Ding, Xiaoyun Wu and Dewang Liu
Photonics 2024, 11(5), 401; https://doi.org/10.3390/photonics11050401 - 26 Apr 2024
Viewed by 504
Abstract
In dynamic space networks, achieving high precision and fast initial pointing of the optical line of sight (LOS) is the key goal in developing this technology. It is the premise and basis of realizing optical LOS capture. Based on the composition and working [...] Read more.
In dynamic space networks, achieving high precision and fast initial pointing of the optical line of sight (LOS) is the key goal in developing this technology. It is the premise and basis of realizing optical LOS capture. Based on the composition and working principle of space optical networking systems, and the effect of real-time position and attitude changes on LOS initial pointing between networks, the matrix transformation and transfer principle is used to establish a multi-link LOS initial pointing model and analyze the factors affecting the size of the field of uncertainty (FOU). In a dynamic space optical networking experiment, the “one-to-two” simultaneous LOS pointing test is carried out, which shows that the model can realize the function of multi-link LOS initial pointing. The sizes of the FOU of the test terminal are 8.67 mrad and 8.34 mrad, respectively, with an average capture time of 18.3 s. Full article
(This article belongs to the Special Issue Next-Generation Free-Space Optical Communication Technologies)
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