| 1. |
- Agrell, Erik, 1965, et al.
(författare)
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Roadmap of optical communications
- 2016
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Ingår i: Journal of Optics. - : IOP Publishing. - 2040-8978 .- 2040-8986. ; 18:6
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Tidskriftsartikel (refereegranskat)abstract
- Lightwave communications is a necessity for the information age. Optical links provide enormous bandwidth, and the optical fiber is the only medium that can meet the modern society's needs for transporting massive amounts of data over long distances. Applications range from global high-capacity networks, which constitute the backbone of the internet, to the massively parallel interconnects that provide data connectivity inside datacenters and supercomputers. Optical communications is a diverse and rapidly changing field, where experts in photonics, communications, electronics, and signal processing work side by side to meet the ever-increasing demands for higher capacity, lower cost, and lower energy consumption, while adapting the system design to novel services and technologies. Due to the interdisciplinary nature of this rich research field, Journal of Optics has invited 16 researchers, each a world-leading expert in their respective subfields, to contribute a section to this invited review article, summarizing their views on state-of-the-art and future developments in optical communications.
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| 2. |
- Agrell, Erik, 1965, et al.
(författare)
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Information-Theoretic Tools for Optical Communications Engineers [Invited]
- 2018
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Ingår i: 31st Annual Conference of the IEEE Photonics Society, IPC 2018.
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Konferensbidrag (refereegranskat)abstract
- Fundamental information-theoretic concepts are explained for nonspecialists, with emphasis on their practical usAge. The notions of a 'FEC threshold' and a 'nonlinear Shannon limit' are critically reviewed, highlighting their limitations and possible alternatives.
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| 3. |
- Agrell, Erik, 1965, et al.
(författare)
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Performance Prediction Recipes for Optical Links
- 2021
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Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 33:18, s. 1034-1037
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Tidskriftsartikel (refereegranskat)abstract
- Although forward error-correction (FEC) coding is an essential part of modern fiber-optic communication systems, it is impractical to implement and evaluate FEC in transmission experiments and simulations. Therefore, it is desirable to accurately predict the end-to-end link performance including FEC from transmission data recorded without FEC. In this tutorial, we provide ready-to-implement “recipes” for such prediction techniques, which apply to arbitrary channels and require no knowledge of information or coding theory. The appropriate choice of recipe depends on properties of the FEC encoder and decoder. The covered metrics include bit error rate, symbol error rate, achievable information rate, and asymptotic information, in all cases computed using a mismatched receiver. Supplementary software implementations are available.
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| 4. |
- Irukulapati, Naga Vishnukanth, 1987, et al.
(författare)
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On Maximum Likelihood Sequence Detectors for Single-channel Coherent Optical Communications
- 2014
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Ingår i: 2014 European Conference on Optical Communication, ECOC 2014; Cannes; France; 21 September 2014 through 25 September 2014. - 9782954944401 ; , s. Art. no. 6964134-
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Konferensbidrag (refereegranskat)abstract
- Two different detectors that account for the nonlinear signal–noise interaction in a single channel coherent optical link are compared. The results indicate that accounting for the correlation between the samples leads to improved performance over stochastic digital backpropagation.
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| 5. |
- Irukulapati, Naga Vishnukanth, 1987, et al.
(författare)
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Stochastic Digital Backpropagation with Residual Memory Compensation
- 2016
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 34:2, s. 566-572
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Tidskriftsartikel (refereegranskat)abstract
- Stochastic digital backpropagation (SDBP) is an extension of digital backpropagation (DBP) and is based on the maximum a posteriori principle. SDBP takes into account noise from the optical amplifiers in addition to handling deterministic linear and nonlinear impairments. The decisions in SDBP are taken on a symbol-by-symbol (SBS) basis, ignoring any residual memory, which may be present due to non-optimal processing in SDBP. In this paper, we extend SDBP to account for memory between symbols. In particular, two different methods are proposed: a Viterbi algorithm (VA) and a decision directed approach. Symbol error rate (SER) for memory-based SDBP is significantly lower than the previously proposed SBS-SDBP. For inline dispersion-managed links, the VA-SDBP has up to 10 and 14 times lower SER than DBP for QPSK and 16-QAM, respectively.
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| 6. |
- Liga, Gabriele, et al.
(författare)
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Optimum detection in presence of nonlinear distortions with memory
- 2015
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Ingår i: 41st European Conference on Optical Communication, ECOC 2015, Valencia, Spain, 27 September - 1 October 2015. - 9788460817413 ; 2015-November
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Konferensbidrag (refereegranskat)abstract
- The performance of nonlinearity-tailored detection for single channel, single span optical fibre systems is studied. Monotonically decreasing bit error rate with transmitted power can be achieved without any nonlinearity compensation.
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| 7. |
- Marsella, D., et al.
(författare)
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A simple strategy for mitigating XPM in nonlinear WDM optical systems
- 2015
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Ingår i: Optical Fiber Communication Conference, OFC 2015.
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Konferensbidrag (refereegranskat)abstract
- Resilience to cross-phase modulation (XPM) can be improved by employing multicarrier modulation formats. The impact of the number of subcarriers on the achievable information rate is discussed and a possible XPM compensation strategy is suggested.
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| 8. |
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| 9. |
- Secondini, M., et al.
(författare)
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Fiber nonlinearity mitigation in WDM systems: Strategies and achievable rates
- 2017
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Ingår i: European Conference on Optical Communication, ECOC. ; 2017-September, s. 1-3
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Konferensbidrag (refereegranskat)abstract
- After reviewing models and mitigation strategies for interchannel nonlinearity, the synergic effect of symbol-rate optimization and phase-noise compensation is investigated. This effect can be practically exploited for nonlinearity mitigation and for the computation of capacity lower bounds.
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| 10. |
- Secondini, M., et al.
(författare)
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Nonlinearity Mitigation in WDM Systems: Models, Strategies, and Achievable Rates
- 2019
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 37:10, s. 2270-2283
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Tidskriftsartikel (refereegranskat)abstract
- After reviewing models and mitigation strategies for interchannel nonlinear interference (NLI), we study its characteristics and coherence properties. Based on this study, we devise an NLI mitigation strategy, which exploits the synergic effect of phase and polarization noise (PPN) compensation and subcarrier multiplexing with symbol-rate optimization. This synergy persists even for high-order modulation alphabets and Gaussian symbols. A particle method for the computation of the resulting achievable information rate and spectral efficiency (SE) is presented and employed to lower-bound the channel capacity. The dependence of the SE on the link length, amplifier spacing, and presence or absence of in-line dispersion compensation is studied. Single-polarization and dual-polarization scenarios with either independent or joint processing of the two polarizations are considered. Numerical results show that, in links with ideal distributed amplification, an SE gain of about 1 bit/s/Hz/polarization can be obtained (or, in alternative, the system reach can be doubled at a given SE) with respect to single-carrier systems without PPN mitigation. The gain is lower with lumped amplification, increases with the number of spans, decreases with the span length, and is further reduced by in-line dispersion compensation. For instance, considering a dispersion-unmanaged link with lumped amplification and an amplifier spacing of 60 km, the SE after 80 spans can be be increased from 4.5 to 4.8 bit/s/Hz/polarization, or the reach raised up to 100 spans (+25%) for a fixed SE.
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| 11. |
- Wymeersch, Henk, 1976, et al.
(författare)
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On the Use of Factor Graphs in Optical Communications
- 2015
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Ingår i: 2015 Optical Fiber Communications Conference and Exhibition, OFC 2015; Los Angeles; United States; 22 March - 26 March 2015. - 9781557529374 ; 2015-June:7122132
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Konferensbidrag (refereegranskat)abstract
- Factor graphs and message passing allow the near-automated development of algorithms in many engineering disciplines, including digital communications. This paper gives an overview of their possible use in optical communications.
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