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Applied Sciences
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New Trends in High-Capacity Optical Communication
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New Trends in High-Capacity Optical Communication

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

Deadline for manuscript submissions: closed (15 June 2021) | Viewed by 8836

Special Issue Editors

Prof. Dr. Sergei Popov

E-Mail Website
Guest Editor
Photonics Division, School of Engineering Sciences, Royal Institute of Technology (KTH), 106 91 Stockholm, Sweden
Interests: photonics; optical communication; laser physics
Special Issues, Collections and Topics in MDPI journals
Dr. Darko Zibar

E-Mail Website
Guest Editor
DTU Fotonik, Technical University of Denmark, DK-2800 Lyngby, Denmark
Interests: photonics; optical communication; machine learning

Special Issue Information

Dear Colleagues,

The recent advances in various technologies are a key factor to securing the rapid development of the modern information society, which faces more and more challenges responding to the explosive growth of communication demands. These branches include, to name a few, big data problems (generation, transmission, and processing), distributed monitoring networks, security, medicine, and the entertainment industry, as well as many others. The core parameters of all communication systems are high-capacity information throughput, energy efficiency, and low latency. To provide efficient solutions for these tasks, numerous approaches and methods have been implemented, making use of hardware achievements and signal processing.

Typical examples of the increase in the hardware “domain” are significant progress in integrated photonics, programmable integrated circuits, low-cost and stable integrated lasers, and low-noise receivers. On the other hand, a high-speed spectrally efficient signal transmission can be achieved by implementing advanced modulation formats, as well as fast and low-complexity digital signal processing, expanding the transmission range into visible, mid IR, and THz bands, including free-space optics communication.

In this Special Issue, we welcome authors to share their research achievements and give overviews on topics dealing with component/system development, signal processing, communication algorithms, as well as those mentioned above.

Prof. Dr. Sergei Popov
Dr. Darko Zibar
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

  • Optical communication
  • Coherent optical communication
  • Free space communication
  • Visible communication
  • Advanced modulation formats
  • Energy efficient spectra
  • Digital signal processing
  • Machine learning

Published Papers (4 papers)

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Research

12 pages, 2612 KiB  
Article
Modeling and Spatial Diversity-Based Receiving Improvement of In-Flight UAV FSO Communication Links
by Anrui Zheng, Yang Huang and Shiming Gao
Appl. Sci. 2021, 11(14), 6365; https://0-doi-org.brum.beds.ac.uk/10.3390/app11146365 - 09 Jul 2021
Cited by 9 | Viewed by 1677
Abstract
An in-flight unmanned aerial vehicle (UAV) free-space optical (FSO) communication channel model is proposed by considering the beam deviation of the UAV under different motion states and the phase distortion caused by atmospheric turbulences. The influence of the different motion states and turbulences [...] Read more.
An in-flight unmanned aerial vehicle (UAV) free-space optical (FSO) communication channel model is proposed by considering the beam deviation of the UAV under different motion states and the phase distortion caused by atmospheric turbulences. The influence of the different motion states and turbulences on the communication quality is evaluated through phase screen and Monte Carlo methods. When the average bit error rate (BER) is 10−5, the signal-to-noise ratio (SNR) should be increased from 13 dB to 20 dB when the tilt angle of the UAV increases from 0 to 5 mrad. An SNR of up to 20 dB is required when the variance of the wind σα2 is 2 mrad. The performance of the in-flight UAV FSO link can be effectively improved through spatial diversity receiving technology. The BER of lower than 10−5 can be obtained just with an SNR of 13 dB if the spatial diversity array with four receivers is used. Full article
(This article belongs to the Special Issue New Trends in High-Capacity Optical Communication)
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16 pages, 3862 KiB  
Article
PAM-N—Fundamental Limits in Chromatic Dispersive-Uncompensated Channels
by Er’el Granot and Gilad Katz
Appl. Sci. 2021, 11(6), 2542; https://0-doi-org.brum.beds.ac.uk/10.3390/app11062542 - 12 Mar 2021
Cited by 1 | Viewed by 1354
Abstract
The fundamental chromatic dispersion limit for an optical communication N-level pulse amplitude modulation (PAM-N) format without any dispersion compensating module is calculated. The main result of this analysis shows that in a non-dispersion-compensated channel, the product β2B2 [...] Read more.
The fundamental chromatic dispersion limit for an optical communication N-level pulse amplitude modulation (PAM-N) format without any dispersion compensating module is calculated. The main result of this analysis shows that in a non-dispersion-compensated channel, the product β2B2L (where β2, L, and B are the dispersion coefficient, fiber length, and the Baud rate, respectively) is bounded by a number, which depends only on the number of levels N. In particular, β2B2L < 0.318, β2B2L < 0.212, and β2B2L < 0.14 for N values of 2, 4, and 8, respectively. Moreover, an analytical expression for a noisy channel’s power penalty was formulated. This analytic expression shows high agreement with numerical simulations. To the best of our knowledge, this is the first time that such a fundamental limit has been formulated for PAM-N systems. Full article
(This article belongs to the Special Issue New Trends in High-Capacity Optical Communication)
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12 pages, 3533 KiB  
Article
Cladding-Pumped Erbium/Ytterbium Co-Doped Fiber Amplifier for C-Band Operation in Optical Networks
by Andis Supe, Sergejs Olonkins, Aleksejs Udalcovs, Ugis Senkans, Rihards Mūrnieks, Lilita Gegere, Dmitrijs Prigunovs, Jurgis Grube, Edgars Elsts, Sandis Spolitis, Oskars Ozolins and Vjaceslavs Bobrovs
Appl. Sci. 2021, 11(4), 1702; https://0-doi-org.brum.beds.ac.uk/10.3390/app11041702 - 14 Feb 2021
Cited by 13 | Viewed by 3604
Abstract
Space-division multiplexing (SDM) attracts attention to cladding-pumped optical amplifiers, but they suffer from a low pump power conversion efficiency. To address this issue, ytterbium (Yb3+) and erbium (Er3+) co-doping is considered as an effective approach. However, it changes the [...] Read more.
Space-division multiplexing (SDM) attracts attention to cladding-pumped optical amplifiers, but they suffer from a low pump power conversion efficiency. To address this issue, ytterbium (Yb3+) and erbium (Er3+) co-doping is considered as an effective approach. However, it changes the gain profile of Er3+-doped fiber amplifiers and induces the gain difference between optical wavelengths in the C-band, significantly limiting the effective band of the dense wavelength-division multiplexed (DWDM) system. This paper is devoted to a detailed study of a cladding-pumped Er3+/Yb3+ co-doped fiber amplifier (EYDFA) through numerical simulations aiming to identify a configuration, before assembling a similar EYDFA in our laboratory premises that ensures the desired performance. The simulation model is based on a commercial double cladding EYDF whose parameters are experimentally extracted and fed to the EYDFA setup for the system-level studies. We investigate the wavelength dependence of the amplifier’s characteristics (absolute gain, gain uniformity, noise figure) and bit error rate (BER) performance for several DWDM channels and their optical power. The obtained results show that a 7 m long EYDF and co-propagating pump direction is preferable for the EYDFA with a 3 W pump source at 975 nm and with the given gain medium characteristics for WDM applications. For instance, it ensures a gain of 19.7–28.3 dB and a noise figure of 3.7–4.2 dB when amplifying 40 DWDM channels with the input power of −20 dBm per channel. Besides, we study EYDFA gain bandwidth and the maximum output power when operating close to the saturation regime and perform a sensitivity analysis showing how the doped fiber’s absorption and emission cross-sections impact the amplification process through energy transfer from Yb3+ to Er3+. Finally, we quantify the power penalty introduced by the EYDFA; the results show that it is not higher than 0.1 dB when amplifying 40 × 10 Gbps non-return-to-zero on-off keying signals from −20 dBm/channel. Full article
(This article belongs to the Special Issue New Trends in High-Capacity Optical Communication)
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18 pages, 1437 KiB  
Article
Mitigating the Impact of Noise on Nonlinear Frequency Division Multiplexing
by Stella Civelli, Enrico Forestieri and Marco Secondini
Appl. Sci. 2020, 10(24), 9099; https://0-doi-org.brum.beds.ac.uk/10.3390/app10249099 - 19 Dec 2020
Cited by 12 | Viewed by 1671
Abstract
In the past years, nonlinear frequency division multiplexing (NFDM) has been investigated as a potentially revolutionary technique for nonlinear optical fiber communication. However, while NFDM is able to exploit the Kerr nonlinearity, its performance lags behind that of conventional systems. In this work, [...] Read more.
In the past years, nonlinear frequency division multiplexing (NFDM) has been investigated as a potentially revolutionary technique for nonlinear optical fiber communication. However, while NFDM is able to exploit the Kerr nonlinearity, its performance lags behind that of conventional systems. In this work, we first highlight that current implementations of NFDM are strongly suboptimal, and, consequently, oversensitive to noise: the modulation does not ensure a large minimum distance between waveforms, while the detection is not tailored to the statistics of noise. Next, we discuss improved detections strategies and modulation techniques, proposing some effective approaches able to improve NFDM. Different flavors of NFDM are compared through simulations, showing that (i) the NFDM performance can be significantly improved by employing more effective detection strategies, with a 5.6 dB gain in Q-factor obtained with the best strategy compared to the standard strategy; (ii) an additional gain of 2.7 dB is obtained by means of a simple power-tilt modulation strategy, bringing the total gain with respect to standard NFDM to 8.3 dB; and (iii) under some parameters range (rate efficiency η≤30%), the combination of improved modulation and detection allows NFDM to outperform conventional systems using electronic dispersion compensation. Full article
(This article belongs to the Special Issue New Trends in High-Capacity Optical Communication)
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