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Photonics
Special Issues
Next-Generation Free-Space Optical Communication Technologies
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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 4315

Special Issue Editors

Dr. Renzhi Yuan

E-Mail Website
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
Dr. Haifeng Yao

E-Mail Website
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

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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

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Published Papers (4 papers)

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Research

12 pages, 3068 KiB  
Article
Performance Exploration of Optical Wireless Video Communication Based on Adaptive Block Sampling Compressive Sensing
by Jinwang Li, Haifeng Yao, Keyan Dong, Yansong Song, Tianci Liu, Zhongyu Cao, Weihao Wang, Yixiang Zhang, Kunpeng Jiang and Zhi Liu
Photonics 2024, 11(10), 969; https://doi.org/10.3390/photonics11100969 - 16 Oct 2024
Viewed by 379
Abstract
Optical wireless video transmission technology combines the advantages of high data rates, enhanced security, large bandwidth capacity, and strong anti-interference capabilities inherent in optical communication, establishing it as a pivotal technology in contemporary data transmission networks. However, video data comprises a large volume [...] Read more.
Optical wireless video transmission technology combines the advantages of high data rates, enhanced security, large bandwidth capacity, and strong anti-interference capabilities inherent in optical communication, establishing it as a pivotal technology in contemporary data transmission networks. However, video data comprises a large volume of image information, resulting in substantial data flow with significant redundant bits. To address this, we propose an adaptive block sampling compressive sensing algorithm that overcomes the limitations of sampling inflexibility in traditional compressive sensing, which often leads to either redundant or insufficient local sampling. This method significantly reduces the presence of redundant bits in video images. First, the sampling mechanism of the block-based compressive sensing algorithm was optimized. Subsequently, a wireless optical video transmission experimental system was developed using a Field-Programmable Gate Array chip. Finally, experiments were conducted to evaluate the transmission of video optical signals. The results demonstrate that the proposed algorithm improves the peak signal-to-noise ratio by over 3 dB compared to other algorithms, with an enhancement exceeding 1.5 dB even in field tests, thereby significantly optimizing video transmission quality. This research contributes essential technical insights for the enhancement of wireless optical video transmission performance. Full article
(This article belongs to the Special Issue Next-Generation Free-Space Optical Communication Technologies)
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10 pages, 4470 KiB  
Article
Demonstration of a Low-SWaP Terminal for Ground-to-Air Single-Mode Fiber Coupled Laser Links
by Ayden McCann, Alex Frost, Skevos Karpathakis, Benjamin Dix-Matthews, David Gozzard, Shane Walsh and Sascha Schediwy
Photonics 2024, 11(7), 633; https://doi.org/10.3390/photonics11070633 - 2 Jul 2024
Viewed by 1014
Abstract
Free space optical technology promises to revolutionize point-to-point communications systems. By taking advantage of their vastly higher frequencies, coherent optical systems outperform their radio counterparts by orders of magnitude in achievable data throughput, while simultaneously lowering the required size, weight, and power (SWaP), [...] Read more.
Free space optical technology promises to revolutionize point-to-point communications systems. By taking advantage of their vastly higher frequencies, coherent optical systems outperform their radio counterparts by orders of magnitude in achievable data throughput, while simultaneously lowering the required size, weight, and power (SWaP), making them ideal for mobile applications. However, the widespread implementation of this technology has been largely hindered by the effects of atmospheric turbulence, often necessitating complex higher-order adaptive optics systems that are largely unsuitable for deployment on mobile platforms. By employing tip/tilt beam-stabilization, we present the results of a bespoke low-SWaP optical terminal that demonstrated single-mode fiber (SMF) coupling. This was achieved by autonomously acquiring and tracking the targets using a combination of aircraft transponder and machine vision feedback to a root-mean-square (RMS) tracking error of 29.4 µrad and at angular rates of up to 0.83 deg/s. To the authors’ knowledge, these works constitute the first published SMF coupled optical link to a full-sized helicopter, and we describe derived quantities relevant to the future refinement of such links. The ability to achieve SMF coupling without the constraints of complex adaptive optics systems positions this technology as a versatile quantum-capable communications solution for land-, air-, and sea-based platforms ranging across commercial, scientific, and military operators. Full article
(This article belongs to the Special Issue Next-Generation Free-Space Optical Communication Technologies)
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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
Cited by 1 | Viewed by 1127
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 798
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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