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Udalcovs, Aleksejs
Publications (4 of 4) Show all publications
Zhang, L., Udalcovs, A., Lin, R., Ozolins, O., Pang, X., Gan, L., . . . Chen, J. (2018). Digital Radio-Over-Multicore-Fiber System with Self-Homodyne Coherent Detection and Entropy Coding for Mobile Fronthaul. In: European Conference on Optical Communication, ECOC: . Paper presented at 2018 European Conference on Optical Communication, ECOC 2018, 23 September 2018 through 27 September 2018. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Digital Radio-Over-Multicore-Fiber System with Self-Homodyne Coherent Detection and Entropy Coding for Mobile Fronthaul
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2018 (English)In: European Conference on Optical Communication, ECOC, Institute of Electrical and Electronics Engineers Inc. , 2018Conference paper, Published paper (Refereed)
Abstract [en]

We experimentally demonstrate a 28-Gbaud 16-QAM self-homodyne digital radio-over-33.6km-7-core-fiber system with entropy coding for mobile fronthaul, achieving error-free carrier aggregation of 330 100-MHz 4096-QAM 5G-new-radio channels and 921 100-MHz QPSK 5G-new-radio channels with CPRI-equivalent data rate up to 3.73-Tbit/s.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2018
Keywords
5G mobile communication systems, Entropy, Homodyne detection, Optical communication, Coherent detection, Data rates, Entropy coding, Fiber systems, Free carriers, Multicore fiber, Radio channels, Self-homodyne, Digital radio
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-252257 (URN)10.1109/ECOC.2018.8535281 (DOI)2-s2.0-85062566010 (Scopus ID)9781538648629 (ISBN)
Conference
2018 European Conference on Optical Communication, ECOC 2018, 23 September 2018 through 27 September 2018
Note

QC20190610

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-11-12Bibliographically approved
Zhang, L., Ozolins, O., Lin, R., Udalcovs, A., Pang, X., Gan, L., . . . Chen, J. (2018). Kernel Adaptive Filtering for Nonlinearity-Tolerant Optical Direct Detection Systems. In: European Conference on Optical Communication, ECOC: . Paper presented at 2018 European Conference on Optical Communication, ECOC 2018, 23 September 2018 through 27 September 2018. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Kernel Adaptive Filtering for Nonlinearity-Tolerant Optical Direct Detection Systems
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2018 (English)In: European Conference on Optical Communication, ECOC, Institute of Electrical and Electronics Engineers Inc. , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Kernel adaptive filtering (KAF) is proposed for nonlinearity-tolerant optical direct detection. for 7× 128 Gbit/s PAM4 transmission over 33.6km 7-core-fiber, KAF only needs 10 equalizer taps to reach KP4-FEC limit (BER@2.2e-4), whereas decision-feedback-equalizer needs 43 equalizer taps to reach HD-FEC limit (BER@3.8e-3).

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2018
Keywords
Adaptive filters, Decision feedback equalizers, Digital television, Optical communication, Direct detection, Kernel adaptive filtering, Optical direct-detection system, Adaptive filtering
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-252252 (URN)10.1109/ECOC.2018.8535560 (DOI)2-s2.0-85063212979 (Scopus ID)9781538648629 (ISBN)
Conference
2018 European Conference on Optical Communication, ECOC 2018, 23 September 2018 through 27 September 2018
Note

QC20190816

Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-16Bibliographically approved
Udalcovs, A., Schatz, R., Wosinska, L. & Monti, P. (2017). Analysis of Spectral and Energy Efficiency Tradeoff in Single-Line Rate WDM Links. Journal of Lightwave Technology, 35(10), 1847-1857
Open this publication in new window or tab >>Analysis of Spectral and Energy Efficiency Tradeoff in Single-Line Rate WDM Links
2017 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 35, no 10, p. 1847-1857Article in journal (Refereed) Published
Abstract [en]

This paper investigates, through simulations, the tradeoff between energy efficiency (EE) and the overall spectral efficiency (SE) of fiber optic links for a given capacity and a link length. The comparison is made for various modulation formats, span lengths, and with/without using forward error correction (FEC). The power consumption of the different system components is estimated from the data sheets of the state-of-the-art equipment. Results show that the use of long single-mode fiber spans (i.e., more than 40 km) improves EE when coherent modulation formats are used. However, with noncoherent formats, the span length must be selected depending on SE, aggregated traffic amount needs to be transmitted, and link length. For almost all modulation formats, FEC reduces the overall energy consumption despite being one of the main power consumers in fiber optic communication systems. The power consumption of 3Rs becomes particularly important when the linear crosstalk limits the system reach. In all other cases, the power consumption of transponders and optical line amplifiers is dominating, but their contribution changes depending on the aggregated traffic amount and system reach.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017
Keywords
3R regeneration, energy efficiency, energy per bit, forward-error correction, modulation formats, span length, spectral efficiency
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-207655 (URN)10.1109/JLT.2017.2651165 (DOI)000399986700011 ()2-s2.0-85018908373 (Scopus ID)
Note

QC 20170607

Available from: 2017-06-07 Created: 2017-06-07 Last updated: 2017-11-10Bibliographically approved
Udalcovs, A., Schatz, R., Monti, P., Ozolins, O., Pang, X., Navarro, J. R. G., . . . Jacobsen, G. (2017). Quantifying spectral and energy efficiency limitations of WDM networks due to crosstalk in optical nodes. In: Optics InfoBase Conference Papers: . Paper presented at Asia Communications and Photonics Conference, ACPC 2017, 10 November 2017 through 13 November 2017. OSA - The Optical Society
Open this publication in new window or tab >>Quantifying spectral and energy efficiency limitations of WDM networks due to crosstalk in optical nodes
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2017 (English)In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2017Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate the significant impact of crosstalk between add and drop ports at optical nodes on energy-efficiency per Hertz in WDM networks employing 32/64 Gbd DP-16QAM transmission, especially when the isolation is reduced to 30dB.

Place, publisher, year, edition, pages
OSA - The Optical Society, 2017
Keywords
Crosstalk, Photonics, Efficiency limitations, WDM networks, Energy efficiency
National Category
Engineering and Technology Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-227817 (URN)10.1364/ACPC.2017.M3C.3 (DOI)2-s2.0-85041640725 (Scopus ID)9781557528209 (ISBN)
Conference
Asia Communications and Photonics Conference, ACPC 2017, 10 November 2017 through 13 November 2017
Note

QC 20180528

Available from: 2018-05-28 Created: 2018-05-28 Last updated: 2018-10-19Bibliographically approved
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