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Photonics
Special Issues
Coherent Transmission Systems in Optical Wireless Communication
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Coherent Transmission Systems in Optical Wireless Communication

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

Deadline for manuscript submissions: closed (10 July 2024) | Viewed by 5378

Special Issue Editors

Dr. Jianyang Shi

E-Mail Website
Guest Editor
Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, Shanghai 200433, China
Interests: visible light communication; modulation formats; optical communication; fiber transmission; machine learning
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Junwen Zhang

E-Mail Website
Guest Editor
Key Laboratory for Information Science of Electromagnetic Waves (MoE), School of Information Science and Technology, Fudan University, Shanghai 200433, China
Interests: fiber transmission; millimeter wave communication; terahertz communication; neural network; optical transmission system
Special Issues, Collections and Topics in MDPI journals
Dr. Hui Chen

E-Mail Website
Guest Editor
Department of Circuit and System, Peng Cheng Laboratory, Shenzhen 518000, China
Interests: optical communication; visible light communication; digital signal processing; machine learning
Dr. Jiao Zhang

E-Mail Website
Guest Editor
Purple Mountain Laboratories, Southeast University, Nanjing 210096, China
Interests: broadband fiber-wireless integration; photonics-aided millimeter-wave/THz-wave communication; next-generation optical access networks
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Coherent optical transmission systems are used to transmit high-speed data over long distances using optical fibers. These systems rely on the coherent detection of light signals, which allows for the recovery of both the amplitude and phase of the transmitted signal. This makes it possible to use advanced modulation formats, such as quadrature amplitude modulation (QAM), to increase the data rate of the system.

Thanks to its numerous advantages, coherent light detection has shown outstanding performance in fiber optic transmission systems. Recently, with the emergence of 6G technology, new requirements have arisen for the data transmission rates of optical wireless communication. As the demand for higher data transmission rates increases, the conventional intensity modulation direct detection system may not suffice, making the development of a coherent system an urgent necessity. To realize coherent transmission systems in optical wireless communication, novel modulation formats, transceiver devices, digital signal processing, and communication mechanisms should be developed in both directions.

The goal of this Special Issue is to address the difficulties and prospects of optical wireless communication with regard to coherent transmission systems, as well as their potential optical solutions, by examining possible development paths, obstacles, and frontier technologies. Additionally, the issue aims to provide a platform to present the latest innovations and research in coherent free space optics. Original research articles and reviews on recent processes and developments will be welcomed. Topics include but are not limited to the following:

  • Free space optics (FSO);
  • Optical wireless communication (OWC);
  • Visible light communication (VLC);
  • Optical modulator;
  • Optical detector;
  • New modulation format and technology;
  • Advanced DSP algorithm;
  • Machine-learning-based algorithm.

Dr. Jianyang Shi
Prof. Dr. Junwen Zhang
Dr. Hui Chen
Dr. Jiao Zhang
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

  • optical wireless communication
  • coherent transmission
  • frees space optics
  • visible light communication

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Published Papers (5 papers)

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Research

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18 pages, 704 KiB  
Article
Adaptive Resource Allocation for Emergency Communications with Unmanned Aerial Vehicle-Assisted Free Space Optical/Radio Frequency Relay System
by Yuanmo Lin, Yuxun Ai, Zhiyong Xu, Jingyuan Wang and Jianhua Li
Photonics 2024, 11(8), 754; https://doi.org/10.3390/photonics11080754 - 13 Aug 2024
Viewed by 1103
Abstract
This paper investigates the problem of coordinated resource allocation for multiple unmanned aerial vehicles (UAVs) to address the scarcity of communication resources in disaster-affected areas. UAVs carrying modules of free space optical (FSO) and radio frequency (RF) serve as relay nodes and edge [...] Read more.
This paper investigates the problem of coordinated resource allocation for multiple unmanned aerial vehicles (UAVs) to address the scarcity of communication resources in disaster-affected areas. UAVs carrying modules of free space optical (FSO) and radio frequency (RF) serve as relay nodes and edge offloading nodes, presenting an FSO/RF dual-hop framework. Considering the varying urgency levels of tasks, we assign task priorities and transform the proposed problem into distributed collaborative optimization problem. Based on the K-means algorithm and the multi-agent deep deterministic policy gradient (MADDPG) algorithm, we propose a UAV-coordinated K-means MADDPG (KMADDPG) to maximize the number of completed tasks while prioritizing high-priority tasks. Simulation results show that KMADDPG is 5% to 10% better than the benchmark DRL methods in convergence performance. Full article
(This article belongs to the Special Issue Coherent Transmission Systems in Optical Wireless Communication)
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10 pages, 1814 KiB  
Article
Optical Frequency Transfer on the Order of 10−19 Fractional Frequency Instability over a 64 m Free-Space Link
by Guoyong Wang, Zhangjian Lu, Xinwen Liang, Keliang He, Yuling He and Xin Ji
Photonics 2024, 11(7), 587; https://doi.org/10.3390/photonics11070587 - 22 Jun 2024
Cited by 1 | Viewed by 750 | Correction
Abstract
High-precision time–frequency is widely used in time measurement, satellite navigation, scientific research, and other fields. With the rapid development of optical clock technology, the fractional frequency instability and uncertainty of optical clock have reached 10−18 orders of magnitude, which is expected to [...] Read more.
High-precision time–frequency is widely used in time measurement, satellite navigation, scientific research, and other fields. With the rapid development of optical clock technology, the fractional frequency instability and uncertainty of optical clock have reached 10−18 orders of magnitude, which is expected to contribute to generating the International Atomic Time and may even be used to redefine the “second” in the future. Therefore, the long-distance transfer of time–frequency signals between optical atomic clocks is of great significance. Free-space optical frequency transfer technology is one of the important technologies for solving the space-based optical clock comparison because of its high transfer precision and easy networking characteristics. In order to solve the long-distance space-based optical clock comparison, this paper investigates a free-space active phase noise compensation method using an Acousto-Optic Modulator (AOM), based on the traditional optical fiber phase noise compensation scheme. This new method is more flexible and scalable than the optical fiber time–frequency transfer technology. The optical frequency transfer over a 64 m free-space link is demonstrated. The fractional frequency transfer instability during free running is 9.50 × 10−16 at 1 s, and 4.44 × 10−16 at 2000 s, and the fractional frequency instability after compensation is 7.10 × 10−17 at 1 s, 3.07 × 10−19 at 2000 s, which is about 1–3 orders of magnitude better than that in free running, and provides a feasible scheme for space-based optical clock comparison. Full article
(This article belongs to the Special Issue Coherent Transmission Systems in Optical Wireless Communication)
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20 pages, 8375 KiB  
Article
A Hybrid Millimeter-Wave and Free-Space-Optics Communication Architecture with Adaptive Diversity Combining and HARQ Techniques
by Yinjun Liu, Xiaochuan Tan, Junlian Jia, Boyu Dong, Changle Huang, Penghao Luo, Jianyang Shi, Nan Chi and Junwen Zhang
Photonics 2023, 10(12), 1320; https://doi.org/10.3390/photonics10121320 - 29 Nov 2023
Cited by 3 | Viewed by 1280
Abstract
We propose and demonstrate a hybrid communication architecture that combines millimeter-wave (MMW) in the radio frequency (RF) domain and free-space-optics (FSO) technologies using adaptive combining and hybrid automatic repeat request (HARQ) techniques. At the receiving end, we employed joint signal processing with an [...] Read more.
We propose and demonstrate a hybrid communication architecture that combines millimeter-wave (MMW) in the radio frequency (RF) domain and free-space-optics (FSO) technologies using adaptive combining and hybrid automatic repeat request (HARQ) techniques. At the receiving end, we employed joint signal processing with an adaptive diversity combining technique (ADCT) based on a maximum ratio combining (MRC) algorithm. We derived closed-form expressions for the outage probability and throughput of the hybrid RF and FSO (RF/FSO) system, considering various characteristics of atmospheric turbulence in the FSO link. Experimental testing with 10-Gbaud quadrature phase shift keying (QPSK) data was conducted under different simulated atmospheric turbulence intensities, FSO and MMW speed-ratios, and forward error correction (FEC) overheads. Additionally, we validated improvements in terms of bit error ratio (BER), outage probability, and throughput performance. Full article
(This article belongs to the Special Issue Coherent Transmission Systems in Optical Wireless Communication)
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Review

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21 pages, 7769 KiB  
Review
A Review of Indoor Optical Wireless Communication
by Huiyi Weng, Wei Wang, Zhiwei Chen, Bowen Zhu and Fan Li
Photonics 2024, 11(8), 722; https://doi.org/10.3390/photonics11080722 - 31 Jul 2024
Viewed by 991
Abstract
Indoor Optical Wireless Communication (OWC) provides a promising solution for high-capacity, low-latency, and electromagnetic interference-resistant wireless communication. Over the past decade, there has been extensive research addressing key challenges in indoor OWC. This article provides an overview of the current development status, key [...] Read more.
Indoor Optical Wireless Communication (OWC) provides a promising solution for high-capacity, low-latency, and electromagnetic interference-resistant wireless communication. Over the past decade, there has been extensive research addressing key challenges in indoor OWC. This article provides an overview of the current development status, key technologies, and challenges faced in the field of indoor OWC. Furthermore, at the end of this overview, an experimental demonstration of an indoor non-line-of-sight (NLOS) OWC system utilizing a spatial light modulator (SLM) for beam steering is demonstrated, which is expected to inspire research on related technologies. Full article
(This article belongs to the Special Issue Coherent Transmission Systems in Optical Wireless Communication)
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Other

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2 pages, 605 KiB  
Correction
Correction: Wang et al. Optical Frequency Transfer on the Order of 10−19 Fractional Frequency Instability over a 64 m Free-Space Link. Photonics 2024, 11, 587
by Guoyong Wang, Zhangjian Lu, Xinwen Liang, Keliang He, Yuling He and Xin Ji
Photonics 2024, 11(9), 850; https://doi.org/10.3390/photonics11090850 - 9 Sep 2024
Viewed by 328
Abstract
In the original publication [...] Full article
(This article belongs to the Special Issue Coherent Transmission Systems in Optical Wireless Communication)
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