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Electronics
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Advanced Photonic Technologies for High-Speed Communications
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Advanced Photonic Technologies for High-Speed Communications

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Optoelectronics".

Deadline for manuscript submissions: closed (1 June 2022) | Viewed by 7133

Special Issue Editor

Dr. Xiaodan Pang

E-Mail Website
Guest Editor
Department of Applied Physics, KTH Royal Institute of Technology, 114 19 Stockholm, Sweden
Interests: free-space communications; terahertz photonics; high-speed data transmissions
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Photonic technologies have played a key role in today’s ICT infrastructure worldwide. Technological advancements in optical fibers, transceivers, amplifiers, switches, and many other active/passive components have driven rapid upgrades in both the telecom and the datacom applications. Advanced modulation, coding, and digital signal processing techniques are among the key enabling technologies for such upgrades in both the line-side and client-side optics. On the wireless side, radio-frequency (RF) technologies have managed to fulfill the requirements of the initial phase of 5G infrastructure that is currently under deployment. However, the RF-based solutions may reach their upper physical limit to support future applications beyond the current generation. Subsequently, novel photonic technologies again show promising potential in supporting such a new wireless communication paradigm with RF-photonics or free-space optics.

In this Special Issue, we would like to showcase recent research efforts and results in physical layer optical communication technologies to address these upcoming challenges, demonstrating the capability and feasibility for future development.

Dr. Xiaodan Pang
Guest Editor

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. Electronics 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 interconnects for data center applications
  • Digital signal processing for short/medium reach optical transmissions
  • Novel modulation and coding techniques
  • Free-space optical communications for terrestrial applications
  • RF-photonics transmissions in the millimeter-wave and terahertz bands
  • Optical wireless communications for indoor scenarios
  • Proof-of-concept experimental demonstrations

Published Papers (4 papers)

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Research

17 pages, 9482 KiB  
Article
Imbalanced Mach-Zehnder Modulator for Fading Suppression in Dispersion-Uncompensated Direct Detection System
by Yixiao Zhu, Xin Miao, Qi Wu, Longjie Yin and Weisheng Hu
Electronics 2021, 10(22), 2866; https://doi.org/10.3390/electronics10222866 - 21 Nov 2021
Cited by 4 | Viewed by 1768
Abstract
In this work, we systematically analyze the impact of three kinds of Mach-Zehnder modulator (MZM) imbalances, including bias deviation, amplitude mismatch, and differential time skew in intensity-modulation direct-detection (IM-DD) links. It is shown that, for power fading limited transmission, the imbalances can be [...] Read more.
In this work, we systematically analyze the impact of three kinds of Mach-Zehnder modulator (MZM) imbalances, including bias deviation, amplitude mismatch, and differential time skew in intensity-modulation direct-detection (IM-DD) links. It is shown that, for power fading limited transmission, the imbalances can be utilized as advantages rather than impairments. Specifically, the bias deviation with single-arm driven mode and amplitude mismatch with differential driven mode can increase the available bandwidth by shifting the frequency of fading notches. Meanwhile, time skew provides another way to avoid fading by shaping the double sideband (DSB) signal into a vestigial sideband (VSB) with an asymmetrical transfer function. In the transmission experiment, 34 Gbaud Nyquist 6/8-ary pulse amplitude modulation (PAM-6/8) signals are used for investigation in a 20 km dispersion-uncompensated standard single-mode fiber (SSMF) link. With the help of a Volterra nonlinear equalizer, all three kinds of imbalances can achieve bit-error rates (BERs) below the 7% and 20% hard-decision forward error correction (HD-FEC) thresholds for PAM-6 and PAM-8 signals, respectively. The received power sensitivity is also compared at the back-to-back (BTB) case and after fiber transmission. Both numerical simulation and experimental demonstration confirm that the dispersion-induced power fading can be effectively suppressed with bias, amplitude, or skew imbalance, providing a feasible solution for transmission distance extension of C-band DD links. Full article
(This article belongs to the Special Issue Advanced Photonic Technologies for High-Speed Communications)
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13 pages, 499 KiB  
Article
Routing and Spectrum Allocation in Spectrum-Sliced Elastic Optical Path Networks: A Primal-Dual Framework
by Yang Wang, Chaoyang Li, Qian Hu, Jabree Flor and Maryam Jalalitabar
Electronics 2021, 10(22), 2809; https://doi.org/10.3390/electronics10222809 - 16 Nov 2021
Cited by 6 | Viewed by 1626
Abstract
The recent decade has witnessed a tremendous growth of Internet traffic, which is expected to continue climbing for the foreseeable future. As a new paradigm, Spectrum-sliced Elastic Optical Path (SLICE) networks promise abundant (elastic) bandwidth to address the traffic explosion, while bearing other [...] Read more.
The recent decade has witnessed a tremendous growth of Internet traffic, which is expected to continue climbing for the foreseeable future. As a new paradigm, Spectrum-sliced Elastic Optical Path (SLICE) networks promise abundant (elastic) bandwidth to address the traffic explosion, while bearing other inherent advantages including enhanced signal quality and extended reachability. The fundamental problem in SLICE networks is to route each traffic demand along a lightpath with continuously and consecutively available sub-carriers, which is known as the Routing and Spectrum Allocation (RSA) problem. Given its NP-Hardness, the solutions to the RSA problem can be classified into two categories: optimal solutions using link-based, path-based, and channel-based Integer Linear Programming (ILP) models, which require extensive computational time; and sub-optimal heuristic and meta-heuristic algorithms, which have no guarantee on the solution quality. In this work, inspired by a channel-based ILP model, we propose a novel primal-dual framework to address the RSA problem, which can obtain a near-optimal solution with guaranteed per-instance closeness to the optimal solution. Full article
(This article belongs to the Special Issue Advanced Photonic Technologies for High-Speed Communications)
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11 pages, 3314 KiB  
Communication
Selective Disinfection Based on Directional Ultraviolet Irradiation and Artificial Intelligence
by Ben Zierdt, Taichu Shi, Thomas DeGroat, Sam Furman, Nicholas Papas, Zachary Smoot, Hong Zhang and Ben Wu
Electronics 2021, 10(20), 2557; https://doi.org/10.3390/electronics10202557 - 19 Oct 2021
Viewed by 1573
Abstract
Ultraviolet disinfection has been proven to be effective for surface sanitation. Traditional ultraviolet disinfection systems generate omnidirectional radiation, which introduces safety concerns regarding human exposure. Large scale disinfection must be performed without humans present, which limits the time efficiency of disinfection. We propose [...] Read more.
Ultraviolet disinfection has been proven to be effective for surface sanitation. Traditional ultraviolet disinfection systems generate omnidirectional radiation, which introduces safety concerns regarding human exposure. Large scale disinfection must be performed without humans present, which limits the time efficiency of disinfection. We propose and experimentally demonstrate a targeted ultraviolet disinfection system using a combination of robotics, lasers, and deep learning. The system uses a laser-galvo and a camera mounted on a two-axis gimbal running a custom deep learning algorithm. This allows ultraviolet radiation to be applied to any surface in the room where it is mounted, and the algorithm ensures that the laser targets the desired surfaces avoids others such as humans. Both the laser-galvo and the deep learning algorithm were tested for targeted disinfection. Full article
(This article belongs to the Special Issue Advanced Photonic Technologies for High-Speed Communications)
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9 pages, 1732 KiB  
Article
Modulation Performance Enhancement of Directly Modulated Injection-Locked Semiconductor Lasers Using an Equivalent Electrical Circuit
by Ho-Jun Bae, Jun-Hyung Cho and Hyuk-Kee Sung
Electronics 2021, 10(19), 2409; https://doi.org/10.3390/electronics10192409 - 02 Oct 2021
Cited by 1 | Viewed by 1422
Abstract
We propose an equivalent electrical circuit model to evaluate the direct modulation performance of optically injection-locked (OIL) semiconductor lasers. We modeled the equivalent circuit of the OIL laser based on alternating complex envelope representations, simulated it using the Simulation Program with Integrated Circuit [...] Read more.
We propose an equivalent electrical circuit model to evaluate the direct modulation performance of optically injection-locked (OIL) semiconductor lasers. We modeled the equivalent circuit of the OIL laser based on alternating complex envelope representations, simulated it using the Simulation Program with Integrated Circuit Emphasis (SPICE), and analyzed the frequency response of the OIL laser. Although the frequency response of the OIL laser is better than that of a free-running laser, its 3-dB modulation performance is degraded by the relaxation oscillation that occurs during direct modulation of the semiconductor laser. To overcome this limitation and maintain the maximum modulation performance within the entire locking range, we also designed an electrical filter to preprocess the electrical modulation signal and compensate for the non-flat modulation output of the OIL laser. The damping ratio of the directly modulated OIL laser increased by 0.101 (280%) and its settling time decreased by >0.037 (44%) when the electrical compensation circuit was added, exhibiting a flat 3-dB modulation bandwidth of 28.79 GHz. Full article
(This article belongs to the Special Issue Advanced Photonic Technologies for High-Speed Communications)
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