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Publications (10 of 56) Show all publications
Kundrat, J., Rouzic, E. L., Mårtensson, J., Melin, S., D'Amico, A., Grammel, G., . . . Curri, V. (2022). GNPy: Lessons Learned and Future Plans [Invited]. In: 2022 European Conference on Optical Communication, ECOC 2022: . Paper presented at 2022 European Conference on Optical Communication, ECOC 2022, 18 September 2022 through 22 September 2022. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>GNPy: Lessons Learned and Future Plans [Invited]
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2022 (English)In: 2022 European Conference on Optical Communication, ECOC 2022, Institute of Electrical and Electronics Engineers Inc. , 2022Conference paper, Published paper (Refereed)
Abstract [en]

We discuss the history, past challenges and future plans of GNPy, an open source project for simulating physical impairments in contemporary DWDM network. The paper describes the unique interaction among network operators, equipment vendors, and standard bodies, as well as challenges in implementing the digital twin of an optical network.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2022
Keywords
DWDM networks, Equipment vendors, Network operator, Open source projects, Physical impairments, Standard bodies
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-64013 (URN)2-s2.0-85146399763 (Scopus ID)9781957171159 (ISBN)
Conference
2022 European Conference on Optical Communication, ECOC 2022, 18 September 2022 through 22 September 2022
Available from: 2023-02-22 Created: 2023-02-22 Last updated: 2023-02-22Bibliographically approved
Kundrat, J., Le Rouzic, E., Mårtensson, J., Campanella, A., Havlis, O., D'Amico, A., . . . Vojtech, J. (2021). GNPy YANG: Open APIs for End-to-End Service Provisioning in Optical Networks. In: 2021 Optical Fiber Communications Conference and Exhibition, OFC 2021 - Proceedings: . Paper presented at 2021 Optical Fiber Communications Conference and Exhibition, OFC 2021, 6 June 2021 through 11 June 2021. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>GNPy YANG: Open APIs for End-to-End Service Provisioning in Optical Networks
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2021 (English)In: 2021 Optical Fiber Communications Conference and Exhibition, OFC 2021 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2021Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate end-to-end service provisioning in a fully disaggregated optical network using open software interfaces. The GNPy quality-of-transmission estimator is extended with a YANG-based API. The YANG modeling work builds on the IETF standard schemas, and describes multiple layers of the network at once. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2021
Keywords
Fiber optic networks, Network layers, Optical fibers, Quality of service, End-to-end service, Multiple layers, Open software, Quality of Transmission, Optical fiber communication
National Category
Telecommunications
Identifiers
urn:nbn:se:ri:diva-55842 (URN)2-s2.0-85112040205 (Scopus ID)9781943580866 (ISBN)
Conference
2021 Optical Fiber Communications Conference and Exhibition, OFC 2021, 6 June 2021 through 11 June 2021
Available from: 2021-08-23 Created: 2021-08-23 Last updated: 2021-08-23Bibliographically approved
Li, Y., Mårtensson, J., Skubic, B., Zhao, Y., Zhang, J., Wosinska, L. & Monti, P. (2020). Flexible RAN: Combining Dynamic Baseband Split Selection and Reconfigurable Optical Transport to Optimize RAN Performance. IEEE Network, 34(4), 180-187
Open this publication in new window or tab >>Flexible RAN: Combining Dynamic Baseband Split Selection and Reconfigurable Optical Transport to Optimize RAN Performance
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2020 (English)In: IEEE Network, ISSN 0890-8044, E-ISSN 1558-156X, Vol. 34, no 4, p. 180-187Article in journal (Refereed) Published
Abstract [en]

The introduction of functional splits in C-RANs brings a tradeoff between radio performance and transport capacity. Higher-layer splits relax transport capacity requirements, whereas radio performance is not guaranteed. Lower-layer splits are beneficial for the radio performance, but they may require a more expensive and high capacity transport network. Facing the challenge of how to deploy 5G RANs in the short-term future, network operators need to find the best functional split options able to accommodate radio performance requirements without incurring excessive transport network costs. This article presents an architecture referred to as F-RAN able to choose the most appropriate split option while considering time-varying radio performance and the availability of transport resources. F-RAN can accommodate these needs by means of an SDN-based orchestration layer and a programmable optical transport network. The performance of F-RAN is benchmarked against a conventional C-RAN architecture in terms of the number of wavelengths and transponders to be deployed. Simulation results confirm the overall benefits of F-RAN in terms of better utilization of transport resources.

Keywords
5G mobile communication, cloud computing, optical fibre networks, radio access networks, software defined networking, telecommunication computing, transponders, flexible RAN, dynamic baseband split selection, reconfigurable optical transport, C-RAN, higher-layer splits, transport capacity requirements, lower-layer splits, expensive capacity transport network, high capacity transport network, 5G RAN, network operators, functional split options, radio performance requirements, time-varying radio performance, transport resources, F-RAN, SDN-based orchestration layer, programmable optical transport network, C-RAN architecture, transport network costs, Band-pass filters, Machine learning, Electromagnetic interference, Optical network units, Antennas, Optical fiber networks
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-52391 (URN)10.1109/MNET.001.1900477 (DOI)
Available from: 2021-02-17 Created: 2021-02-17 Last updated: 2021-06-14Bibliographically approved
Spinnler, B., Lindgren, A., Andersen, U., Melin, S., Slovak, J., Schairer, W., . . . Sommerkorn-Krombholz, B. (2019). Autonomous intelligent transponder enabling adaptive network optimization in a live network field trial. Journal of Optical Communications and Networking, 11(9), C1-C9, Article ID 8781793.
Open this publication in new window or tab >>Autonomous intelligent transponder enabling adaptive network optimization in a live network field trial
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2019 (English)In: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 11, no 9, p. C1-C9, article id 8781793Article in journal (Refereed) Published
Abstract [en]

We introduce a new transponder type for optical networks called an autonomous intelligent transponder (AIT). It is capable of autonomously adapting transmission parameters to the quality of the link over which it is transmitting. This concept fills one of the main gaps toward the realization of flexible, aware optical networks. We present experimental results to validate the AIT concept as part of a field trial in Telia Carrier's live optical European backbone network. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
Fiber optic networks, Adaptive networks, Back-bone network, Field trial, Live networks, Main Gap, Transmission parameters, Transponders
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39791 (URN)10.1364/JOCN.11.0000C1 (DOI)2-s2.0-85070268942 (Scopus ID)
Available from: 2019-08-19 Created: 2019-08-19 Last updated: 2021-06-14Bibliographically approved
Ozolins, O., Udalcovs, A., Pang, X., Lin, R., Djupsjöbacka, A., Mårtensson, J., . . . Jacobsen, G. (2018). 112 Gbps/λ PAM4 inter-DCI with continuous-fiber Bragg grating based dispersion compensators. In: Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF) OSA Technical Digest (online) (Optical Society of America, 2018), paper NeTh3F.3: . Paper presented at Photonic Networks and Devices 2018 Zurich Switzerland 2–5 July 2018. , Article ID NeTh3F.3.
Open this publication in new window or tab >>112 Gbps/λ PAM4 inter-DCI with continuous-fiber Bragg grating based dispersion compensators
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2018 (English)In: Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF) OSA Technical Digest (online) (Optical Society of America, 2018), paper NeTh3F.3, 2018, article id NeTh3F.3Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate 56 Gbaud/λ PAM4 inter - data center interconnects over 81 km single core single mode fiber and 33.6 km 7-core single mode fiber with continuous-fiber Bragg grating based chromatic dispersion compensators covering C-band.

Keywords
Chromatic dispersion, Fiber Bragg gratings, Fibers, Photonic devices, Photonics, Pulse amplitude modulation, C-bands, Chromatic dispersion compensators, Continuous fibers, Data centers, Dispersion compensator, Single mode fibers
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-35006 (URN)10.1364/NETWORKS.2018.NeTh3F.3 (DOI)2-s2.0-85051272180 (Scopus ID)9781557528209 (ISBN)
Conference
Photonic Networks and Devices 2018 Zurich Switzerland 2–5 July 2018
Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2024-03-06Bibliographically approved
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: : . Paper presented at 2018 European Conference on Optical Communication (ECOC).
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)Conference 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.

Keywords
5G mobile communication, entropy codes, homodyne detection, mobile computing, optical fibres, optical modulation, quadrature amplitude modulation, quadrature phase shift keying, radio-over-fibre, wireless channels, 330 100-MHz QPSK 5G-new-radio channels, 921 100-MHz 4096-QAM 5G-new-radio channels, CPRI-equivalent data rate, error-free carrier aggregation, radio-over-33.6km-7-core-fiber system, 28-Gbaud 16-QAM self-homodyne, mobile fronthaul, entropy coding, self-homodyne coherent detection, digital radio-over-multicore-fiber system, Quantization (signal), Modulation, Coherence, OFDM, Entropy
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37650 (URN)10.1109/ECOC.2018.8535281 (DOI)2-s2.0-85062566010 (Scopus ID)
Conference
2018 European Conference on Optical Communication (ECOC)
Available from: 2019-01-29 Created: 2019-01-29 Last updated: 2024-03-11Bibliographically approved
Li, Y., Mårtensson, J., Fiorani, M., Skubic, B., Ghebretensaé, Z., Zhao, Y., . . . Monti, P. (2018). Flexible RAN: A Radio Access Network Concept with Flexible Functional Splits and a Programmable Optical Transport. In: European Conference on Optical Communication, ECOC: . Paper presented at 43rd European Conference on Optical Communication, ECOC 2017, 17 September 2017 through 21 September 2017.
Open this publication in new window or tab >>Flexible RAN: A Radio Access Network Concept with Flexible Functional Splits and a Programmable Optical Transport
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2018 (English)In: European Conference on Optical Communication, ECOC, 2018Conference paper, Published paper (Refereed)
Abstract [en]

We present the flexible RAN concept and evaluate its performance in different radio coordination scenarios considering an optical transport network. Results show the benefits of flexible RAN compared to C-RAN in terms of wavelength usage and transponder cost.

Keywords
Signal systems, Optical transport, Optical transport networks, Radio access networks, Transponder costs, Optical communication
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34493 (URN)10.1109/ECOC.2017.8345857 (DOI)2-s2.0-85046953276 (Scopus ID)9781538656242 (ISBN)
Conference
43rd European Conference on Optical Communication, ECOC 2017, 17 September 2017 through 21 September 2017
Note

 Funding details: K5; Funding details: 671636, VINNOVA;

Available from: 2018-08-09 Created: 2018-08-09 Last updated: 2021-06-14Bibliographically approved
Udalcovs, A., Pang, X., Ozolins, O., Lin, R., Gan, L., Schatz, R., . . . Jacobsen, G. (2018). MCF-enabled self-homodyne 16/64QAM transmission for SDM optical access networks. In: Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2018), paper SM4C.5: . Paper presented at CLEO: Science and Innovations 2018 San Jose, California United States 13–18 May 2018.
Open this publication in new window or tab >>MCF-enabled self-homodyne 16/64QAM transmission for SDM optical access networks
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2018 (English)In: Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2018), paper SM4C.5, 2018Conference paper, Published paper (Refereed)
Abstract [en]

We experimentally demonstrate a 28-Gbaud circular and square 16/64QAM transmission over a 33.6-km long seven-core fiber with the LO passed through one of the cores for self-homodyne coherent detection employing a low-complexity digital signal processing.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34487 (URN)10.1364/CLEO_SI.2018.SM4C.5 (DOI)2-s2.0-85048990561 (Scopus ID)9781557528209 (ISBN)
Conference
CLEO: Science and Innovations 2018 San Jose, California United States 13–18 May 2018
Available from: 2018-08-09 Created: 2018-08-09 Last updated: 2024-03-11Bibliographically approved
Udalcovs, A., Ozolins, O., Pang, X., Navarro, J. R., Lin, R., Levantesi, M., . . . Popov, S. (2018). Towards Coherent Detection in SDM-based Optical Access Networks. In: : . Paper presented at Progress In Electromagnetics Research Symposium Abstracts, Toyama, Japan, 1–4 August, 2018.
Open this publication in new window or tab >>Towards Coherent Detection in SDM-based Optical Access Networks
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2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

To tackle the continued increase in capacity demand in optical access, self-homodyne coherent detection (SHCD) is being considered as a candidate solution, utilizing a spatial division multiplexing (SDM) in a low-crosstalk multicore fiber (MCF) [1, 2] and high-order modulation formats such as quadrature phase-shift keying (QPSK), 16-levels quadrature amplitude modulation (16-QAM) or even 64-levels QAM (64-QAM) . The latest imposes strict requirements on both the performance of digital signal processing (DSP) and the spectral purity of the free running lasers [4–6]. Although a SHCD scheme relaxes the laser linewidth requirements, eliminates the need for a carrier frequency tracking, the necessity for a carrier phase estimation remains if high-order constellations are considered. The reasons for that are (1) residual phase noise in a system and (2) a closer location of the constellation points in the complex plane, which leads to a significantly lower phase noise tolerance as compared to QPSK or even 16-QAM signals . Therefore, it is of crucial importance to propose a low-complexity (and low-latency) phase estimation algorithms for these scenarios as well, especially because traditional algorithms cannot be directly employed for 64QAM. During this presentation,

first, we overview our recent activities on designing and experimental validation of a high-performance and a low-complexity DSP block, focusing on carrier phase recovery (CPR) suitable for circular and square m-QAM constellations. For more information about the efficient CPR schemes for m-QAM, we recommend the

OFC2017 and ACP2017 proceedings.

Second, after the efficient CPR scheme is explained, we provide an insight into a solution of SDM-based optical access network where self-homodyne coherent detection (SHCD) scheme with our novel low-complexity CPR is implemented for a 28-Gbaud 16-QAM and 64- QAM transmission in downstream links with a goal to improve their spectral efficiency and to increase a phase-noise tolerance, which paves the way towards higher cost-efficiency. The proposed architecture together with the experimental demonstration is given in

CLEO2018 conference proceedings

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37722 (URN)
Conference
Progress In Electromagnetics Research Symposium Abstracts, Toyama, Japan, 1–4 August, 2018
Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2024-03-11Bibliographically approved
Li, Y., Mårtensson, J., Fiorani, M., Skubic, B., Ghebretensae, Z., Zhao, Y., . . . Monti, P. (2017). Flexible RAN: a Radio Access Network Concept with Flexible Functional Splits and a Programmable Optical Transport. In: : . Paper presented at ECOC 2017. Gothenburg, Sweden 17-21 September 2017..
Open this publication in new window or tab >>Flexible RAN: a Radio Access Network Concept with Flexible Functional Splits and a Programmable Optical Transport
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2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

We present the flexible RAN concept and evaluate its performance in different radio coordination scenarios considering an optical transport network. Results show the benefits of flexible RAN compared to C-RAN in terms of wavelength usage and transponder cost.

National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-33099 (URN)10.1109/ECOC.2017.8345857 (DOI)2-s2.0-85046953276 (Scopus ID)9781538656242 (ISBN)
Conference
ECOC 2017. Gothenburg, Sweden 17-21 September 2017.
Available from: 2018-01-16 Created: 2018-01-16 Last updated: 2021-06-14Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8160-4484

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