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Applied Sciences
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Nonlinearity Compensation for Optical Communication Systems
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Nonlinearity Compensation for Optical Communication Systems

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

Deadline for manuscript submissions: closed (31 May 2019) | Viewed by 7639

Special Issue Editors

Dr. Francesco Da Ros

E-Mail Website
Guest Editor
Danmarks Tekniske Universitet, Department of Photonics Engineering, Lyngby, Denmark
Interests: optical communications, nonlinearity compensation, optical signal processing
Dr. Gabriele Liga

E-Mail Website
Guest Editor
Department of Electronic & Electrical Engineering, UCL, London, UK
Interests: optical communications; communication theory; information theory

Special Issue Information

Dear Colleagues,

The impact of Kerr nonlinearity on optical communication systems is widely recognized as one of the key challenges in the quest for higher transmission rates. Nonlinearity compensation techniques have, thus, received a significant attention over the past few years both in the academic environment and within industry. As a result, several impressive results have been reported in the literature: all-optical and digital approaches spanning from optical phase conjugation and twin-wave transmission on one side, and digital backpropagation and Volterra methods on the other have shown remarkable progress. Alternative approaches based on nonlinearity-tolerant transmission schemes have also been proposed. Finally, a few preliminary demonstrations have paved the way for combined all-optical and digital schemes in order to leverage the strengths of each domain and mutually mitigate their respective weaknesses. This Special Issue focuses on the latest research findings in the area of nonlinearity compensation, with a particular attention to proof of concepts for novel schemes and innovative system demonstrations.

Dr. Francesco Da Ros
Dr. Gabriele Liga
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 systems
  • Kerr nonlinearity
  • Nonlinearity compensation
  • Digital backpropagation
  • Nonlinear Volterra equalisation
  • Optical phase conjugation
  • Symbol-rate adaptation

Published Papers (2 papers)

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Research

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10 pages, 15541 KiB  
Article
Multi-Twin-SSB Modulation with Direct Detection Based on Kramers–Kronig Scheme for Long-Reach PON Downstream
by Xiang Gao, Yuancheng Cai, Bo Xu, Xiaoling Zhang and Kun Qiu
Appl. Sci. 2019, 9(4), 748; https://doi.org/10.3390/app9040748 - 21 Feb 2019
Cited by 3 | Viewed by 4337
Abstract
As the demand for high data volumes keeps increasing in optical access networks, transmission capacities and distance are becoming bottlenecks for passive optical networks (PONs). To solve this problem, a novel scheme based on multi-twin single sideband (SSB) modulation with direct detection is [...] Read more.
As the demand for high data volumes keeps increasing in optical access networks, transmission capacities and distance are becoming bottlenecks for passive optical networks (PONs). To solve this problem, a novel scheme based on multi-twin single sideband (SSB) modulation with direct detection is proposed and investigated in this paper. At the central office, two SSB signals are generated simultaneously with the same digital-to-analog converters (DACs). The twin-SSB signal is not only robust against frequency selected power fading introduced by chromatic dispersion (CD), but also improves the spectral efficiency (SE). By combining a twin-SSB technique with multi-band carrier-less amplitude/phase modulation (multi-CAP), different optical network units (ONUs) can be supported by flexible multi-band allocation based on software-reconfigurable optical transceivers. The Kramers–Kronig (KK) scheme is adopted on the ONU side to effectively mitigate the signal–signal beat interference (SSBI) induced by the square-law detection. The proposed system is extensively studied and validated with four sub-bands using 50 Gbps 16 quadrature amplitude modulation (QAM) modulation for each sub-band using numerical simulations. Digital pre-equalization is introduced at the transmitter-side to balance the performance of different ONUs. After system optimization, a bit error rate (BER) threshold for hard decision forward error correction (HD-FEC) code with 7% redundancy ratio (BER = 3.8 × 10−3) can be reached for all ONUs over 50-km standard single-mode fiber. Full article
(This article belongs to the Special Issue Nonlinearity Compensation for Optical Communication Systems)
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Review

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15 pages, 1774 KiB  
Review
Equalization Methods for Out-of-Band Nonlinearity Mitigation in Fiber-Optic Communications
by Ori Golani, Meir Feder and Mark Shtaif
Appl. Sci. 2019, 9(3), 511; https://doi.org/10.3390/app9030511 - 2 Feb 2019
Cited by 6 | Viewed by 3008
Abstract
In recent years, it has been established that the adverse effects of nonlinear interference noise (NLIN) can be mitigated using adaptive equalization methods. As such, a wide variety of adaptive equalization methods have been used to treat nonlinearity, in different transmission scenarios. This [...] Read more.
In recent years, it has been established that the adverse effects of nonlinear interference noise (NLIN) can be mitigated using adaptive equalization methods. As such, a wide variety of adaptive equalization methods have been used to treat nonlinearity, in different transmission scenarios. This paper reviews the principles of out-of-band nonlinearity mitigation using adaptive equalization. Statistical properties of NLIN that can be exploited for mitigation are discussed, as well as the cost and benefit of various types of equalizers. In particular we describe the equivalence between the NLIN and time-dependent inter-symbol-interference (ISI) and discuss ways in which the ISI coefficients can be characterized theoretically and experimentally. We further discuss the effectiveness of existing ISI mitigation algorithms, and explain the need for designing customized algorithms that take advantage of the various correlation properties characterizing the ISI coefficients. This paper is intended to be a practical reference for researchers who want to apply equalization algorithms or design new methods for nonlinearity mitigation. Full article
(This article belongs to the Special Issue Nonlinearity Compensation for Optical Communication Systems)
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