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Applied Sciences
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Optical Communication Networks: Progress and Challenges
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Optical Communication Networks: Progress and Challenges

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (25 May 2022) | Viewed by 6678

Special Issue Editors

Dr. Petr Münster

E-Mail Website
Guest Editor
1. Department of Telecommunications, Brno University of Technology, Technicka 3082/12, 616 00 Brno, Czech Republic
2. Department of Optical Networks, CESNET a.l.e., Zikova 4, 160 00 Prague, Czech Republic
Interests: fiber-optical sensors; fiber-optical networks; non-data optical transmission; optical amplifiers; optical networks security; hacking of optical network infrastructure
Special Issues, Collections and Topics in MDPI journals
Dr. Tomas Horvath

E-Mail Website
Guest Editor
Department of Telecommunications, Brno University of Technology, Technicka 3082/12, 616 00 Brno, Czech Republic
Interests: optical networks; passive optical networks; simulations; RWA; photonic services; optical network security
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Optical networks play an important role in fast data transmission over long distances, and optical fibers are moving from core and metro networks to access networks. It is not, however, just speed that makes optical networks stand out when it comes to data transmission, which is of great importance in today’s society; other photonic services offered by optical networks include accuracy, stable frequency, etc. Recently, attention has focused on fiber-optic sensing and secure cryptography key exchange—also known as quantum key distribution (QKD). Research in these new services and especially the results from field trials are very welcome. Topics of interest include, but are not limited to, the topics outlined in the keywords.

Assoc. Prof. Petr Münster
Dr. Tomas Horvath
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. Applied Sciences is an international peer-reviewed open access semimonthly 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

  • Software-defined networks (SDN)
  • Flexible and elastic optical (fiber) networks
  • Photonic services
  • Optical spectrum as a service, spectrum allocation
  • High-speed optical data transmission in global and local networks
  • Precise time/stable frequency transmission
  • Quantum key distribution (QKD) over fiber Optical network security
  • Optical fiber sensors
  • Quality of Services (QoS)
  • Routing and wavelength assignment (RWA)
  • Routing and spectrum assignment (RSA)
  • Optical access networks

Published Papers (3 papers)

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Research

16 pages, 3224 KiB  
Article
Theoretical and Experimental Analysis on Statistical Properties of Coupling Efficiency for Single-Mode Fiber in Free-Space Optical Communication Link Based on Non-Kolmogorov Turbulence
by Lie Ma, Shijie Gao, Bo Chen and Yongkai Liu
Appl. Sci. 2022, 12(12), 6075; https://doi.org/10.3390/app12126075 - 15 Jun 2022
Cited by 4 | Viewed by 1541
Abstract
Non-Kolmogorov turbulence has been widely observed in free-space optical communication links and should be used to evaluate the system performance. We calculated the wavefront residual variance in the condition of the non-Kolmogorov turbulence model and deduced the mathematical expression of the probability density [...] Read more.
Non-Kolmogorov turbulence has been widely observed in free-space optical communication links and should be used to evaluate the system performance. We calculated the wavefront residual variance in the condition of the non-Kolmogorov turbulence model and deduced the mathematical expression of the probability density function (PDF) for the coupling efficiency (CE) of a single-mode fiber (SMF). The PDF was simulated, and the results showed its robustness and rationality. Moreover, an experiment was set up to verify the PDF with experimental distribution. The correlation coefficients are above 0.95 in all cases, which means the statistical model of the CE fitted the experimental distribution well. Full article
(This article belongs to the Special Issue Optical Communication Networks: Progress and Challenges)
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23 pages, 7381 KiB  
Article
Design of Bipolar Optical Code-Division Multiple-Access Techniques Using Phase Modulator for Polarization Coding in Wireless Optical Communication
by Eddy Wijanto and Chun-Ming Huang
Appl. Sci. 2021, 11(13), 5955; https://doi.org/10.3390/app11135955 - 26 Jun 2021
Cited by 5 | Viewed by 2123
Abstract
In this study, a bipolar optical code-division multiple-access (Bi-OCDMA) technique based on spectral amplitude coding (SAC) was proposed by using a phase modulator to realize polarization coding through a free-space optical (FSO) channel. Various types of noise, such as amplified spontaneous emission (ASE) [...] Read more.
In this study, a bipolar optical code-division multiple-access (Bi-OCDMA) technique based on spectral amplitude coding (SAC) was proposed by using a phase modulator to realize polarization coding through a free-space optical (FSO) channel. Various types of noise, such as amplified spontaneous emission (ASE) noise, thermal noise, and shot noise, were included in the simulation to approach the real application. The first simulation, utilizing a modified M-sequence as signature code, demonstrated that the proposed Bi-OCDMA system could be implemented in FSO communication. The proposed Bi-OCDMA scheme improves the transmission rate and power efficiency compared with the previous scheme. The structure of the proposed system alleviates multiple-access interference (MAI) with a simple and cost-effective design. The second simulation observed the performance of the proposed Bi-OCDMA for two users with several well-known SAC codes, i.e., multi-diagonal (MD) code, modified quadratic congruence (MQC) code, modified maximum length sequence (M-sequence) code, and Walsh–Hadamard code, in extreme weather conditions, both for additive white Gaussian noise (AWGN) and turbulence-induced fading channel. The simulation results indicated that the Walsh–Hadamard code has superior performance compared to other codes. The results show the MD code can be implemented in the proposed Bi-OCDMA scheme for a medium-distance FSO. Full article
(This article belongs to the Special Issue Optical Communication Networks: Progress and Challenges)
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17 pages, 3534 KiB  
Article
POL-MUX System for Noncoherent Optical Networks
by Radim Sifta, Michal Latal, Petr Munster and Tomas Horvath
Appl. Sci. 2021, 11(12), 5582; https://doi.org/10.3390/app11125582 - 16 Jun 2021
Cited by 1 | Viewed by 1877
Abstract
This paper is focused on applying a polarization multiplex to passive optical networks to double their transmission bandwidth without significant changes in the distribution network. Although polarization multiplexes are already employed for high-speed optical transport networks with digital signal processing and coherent detection, [...] Read more.
This paper is focused on applying a polarization multiplex to passive optical networks to double their transmission bandwidth without significant changes in the distribution network. Although polarization multiplexes are already employed for high-speed optical transport networks with digital signal processing and coherent detection, we propose a system that could be used in existing older optical networks using a dynamic polarization controller in combination with a wavelength division multiplex. Full article
(This article belongs to the Special Issue Optical Communication Networks: Progress and Challenges)
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