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Publications (8 of 8) Show all publications
Xue, L., Yi, L., Zhang, L., Ozolins, O., Udalcovs, A., Pang, X. & Chen, J. (2019). 50-Gb/s Dispersion-unmanaged DMT Transmission with Injection Locked 10G-class 1.55-mu m DML. In: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO): . Paper presented at Conference on Lasers and Electro-Optics (CLEO), MAY 05-10, 2019, San Jose, CA. Optical Society of America
Open this publication in new window or tab >>50-Gb/s Dispersion-unmanaged DMT Transmission with Injection Locked 10G-class 1.55-mu m DML
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2019 (English)In: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), Optical Society of America, 2019Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate 50-Gb/s DMT signal transmission over 20-km SMF by using a 10G-class 1.55-mu m DML without optical dispersion compensation. Injection locking technique is introduced, which doubles system bandwidth and greatly suppresses DML chirp.

Place, publisher, year, edition, pages
Optical Society of America, 2019
Series
Conference on Lasers and Electro-Optics, ISSN 2160-9020
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-259472 (URN)10.1364/CLEO_SI.2019.SW4O.2 (DOI)000482226302139 ()2-s2.0-85068112123 (Scopus ID)978-1-943580-57-6 (ISBN)
Conference
Conference on Lasers and Electro-Optics (CLEO), MAY 05-10, 2019, San Jose, CA
Note

QC 20190917

Available from: 2019-09-17 Created: 2019-09-17 Last updated: 2019-09-17Bibliographically approved
Deniel, L., Gay, M., Perez Galacho, D., Baudot, C., Bramerie, L., Ozolins, O., . . . Marris-Morini, D. (2019). DAC-less PAM-4 generation in the O-band using a silicon Mach-Zehnder modulator. Optics Express, 27(7), 9740-9748
Open this publication in new window or tab >>DAC-less PAM-4 generation in the O-band using a silicon Mach-Zehnder modulator
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2019 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 7, p. 9740-9748Article in journal (Refereed) Published
Abstract [en]

We demonstrate 20-Gb/s 4-level pulse amplitude modulation (PAM-4) signal generation using a silicon Mach-Zehnder modulator (MZM) in the O-band. The modulator is driven by two independent binary streams. and the PAM-4 signal is thus generated directly on the chip, avoiding the use of power-hungry digital-to-analog converters (DACs). With optimized amplitude levels of the binary signals applied to the two arms of the MZM, a pre-forward error correction (FEC) bit-error rate (BER) as low as 7.6 x 10(-7) is obtained. In comparison with a commercially available LiNbO3 modulator, the penalty is only 2 dB at the KP4 FEC threshold of 2.2 x 10(-4).

Place, publisher, year, edition, pages
OPTICAL SOC AMER, 2019
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-252407 (URN)10.1364/OE.27.009740 (DOI)000466708200039 ()31045123 (PubMedID)2-s2.0-85064404091 (Scopus ID)
Note

QC 20190716

Available from: 2019-07-16 Created: 2019-07-16 Last updated: 2019-07-16Bibliographically approved
Pang, X., Zhang, L., Ozolins, O., Udalcovs, A., Lin, R., Schats, R., . . . Chen, J. (2019). Key technologies to enable terabit-scale digital radio-over-fiber systems. In: Broadband Access Communication Technologies XIII: . Paper presented at Broadband Access Communication Technologies XIII 2019; San Francisco; United States; 4 February 2019 through 5 February 2019. SPIE - International Society for Optical Engineering, 10945, Article ID 109450E.
Open this publication in new window or tab >>Key technologies to enable terabit-scale digital radio-over-fiber systems
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2019 (English)In: Broadband Access Communication Technologies XIII, SPIE - International Society for Optical Engineering, 2019, Vol. 10945, article id 109450EConference paper, Published paper (Refereed)
Abstract [en]

With the approach of the 5G era, stringent requirements are imposed on the data transport solutions, including both of the supported transmission reach and the capacity. Radio-over-fiber technologies are considered to be promising candidates to cope with both aspects, owing to the low-loss and broad-bandwidth nature of the optical fibers. Meanwhile with such optical transport solutions, signals can be collected from the distributed remote radio sites and processed in a centralized manner. In this report, we target on the digital radio-over-fiber systems, and discuss about several key technologies, focusing on the aspects of coding and transmission, which could potentially enable terabit-scale data transport.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2019
Series
Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 10945
Keywords
coding, Digital radio-over-fiber, fiber optics communications, modulation, radio frequency photonics
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-251913 (URN)10.1117/12.2509281 (DOI)000465823300012 ()2-s2.0-85062497561 (Scopus ID)9781510625327 (ISBN)
Conference
Broadband Access Communication Technologies XIII 2019; San Francisco; United States; 4 February 2019 through 5 February 2019
Note

QC 20190523

Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-05-23Bibliographically approved
Gyger, S., Zeuner, K. D., Jöns, K. D., Elshaari, A. W., Paul, M., Popov, S., . . . Zwiller, V. (2019). Reconfigurable frequency coding of triggered single photons in the telecom C-band. Optics Express, 27(10), 14400-14406
Open this publication in new window or tab >>Reconfigurable frequency coding of triggered single photons in the telecom C-band
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2019 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 10, p. 14400-14406Article in journal (Refereed) Published
Abstract [en]

In this work, we demonstrate reconfigurable frequency manipulation of quantum states of light in the telecom C-band. Triggered single photons are encoded in a superposition state of three channels using sidebands up to 53 GHz created by an off-the-shelf phase modulator. The single photons are emitted by an InAs/GaAs quantum dot grown by metal-organic vapor-phase epitaxy within the transparency window of the backbone fiber optical network. A cross-correlation measurement of the sidebands demonstrates the preservation of the single photon nature; an important prerequisite for future quantum technology applications using the existing telecommunication fiber network.

Place, publisher, year, edition, pages
Optical Society of America, 2019
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-253738 (URN)10.1364/OE.27.014400 (DOI)000469220500072 ()31163890 (PubMedID)2-s2.0-85065830027 (Scopus ID)
Note

QC 20190617

Available from: 2019-06-17 Created: 2019-06-17 Last updated: 2019-10-14Bibliographically approved
Zhang, L., Udalcovs, A., Lin, R., Ozolins, O., Pang, X., Gan, L., . . . Chen, J. (2019). Toward Terabit Digital Radio over Fiber Systems: Architecture and Key Technologies. IEEE Communications Magazine, 57(4), 131-137
Open this publication in new window or tab >>Toward Terabit Digital Radio over Fiber Systems: Architecture and Key Technologies
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2019 (English)In: IEEE Communications Magazine, ISSN 0163-6804, E-ISSN 1558-1896, Vol. 57, no 4, p. 131-137Article in journal (Refereed) Published
Abstract [en]

To support massive deployment of broadband radio applications, such as 5G and high-definition videos for terrestrial televisions, large system capacity and high spectrum efficiency are highly demanded in radio over fiber (RoF) systems. In this article, we propose a terabit digital RoF system capable of providing high-speed transmission, where multicore fiber (MCF) is introduced for the access segment between the central unit and remote unit. Two key technologies that greatly enhance system capacity and spectrum efficiency, namely MCF enabled self-homodyne detection and compressed quantization, are demonstrated.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-252405 (URN)10.1109/MCOM.2019.1800426 (DOI)000466916300020 ()2-s2.0-85065453398 (Scopus ID)
Note

QC 20190716

Available from: 2019-07-16 Created: 2019-07-16 Last updated: 2019-07-16Bibliographically 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: 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
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
Pang, X., Rodrigo Navarro, J., Kakkar, A., Olmedo, M. I., Ozolins, O., Schatz, R., . . . Jacobsen, G. (2016). Advanced Modulations and DSP Enabling High-speed Coherent Communication Using Large Linewidth Lasers. In: 2016 PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS): . Paper presented at Progress in Electromagnetic Research Symposium (PIERS), AUG 08-11, 2016, Shanghai, PEOPLES R CHINA (pp. 4849-4849). IEEE
Open this publication in new window or tab >>Advanced Modulations and DSP Enabling High-speed Coherent Communication Using Large Linewidth Lasers
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2016 (English)In: 2016 PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS), IEEE , 2016, p. 4849-4849Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
IEEE, 2016
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-207936 (URN)000400013904126 ()978-1-5090-6093-1 (ISBN)
Conference
Progress in Electromagnetic Research Symposium (PIERS), AUG 08-11, 2016, Shanghai, PEOPLES R CHINA
Note

QC 20170529

Available from: 2017-05-29 Created: 2017-05-29 Last updated: 2017-11-10Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9839-7488

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