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Digital signal processing approaches for semiconductor phase noise tolerant coherent transmission systems
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO. Technical University of Denmark (DTU), Denmark .ORCID iD: 0000-0002-8543-4531
RISE ACREO AB.ORCID iD: 0000-0003-4906-1704
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.ORCID iD: 0000-0003-3056-4678
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2015 (English)In: Proceedings of SPIE - The International Society for Optical Engineering, 2015Conference paper, Published paper (Refereed)
Abstract [en]

We discuss about digital signal processing approaches that can enable coherent links based on semiconductor lasers. A state-of-the art analysis on different carrier-phase recovery (CPR) techniques is presented. We show that these techniques are based on the assumption of lorentzian linewidth, which does not hold for monolithically integrated semiconductor lasers. We investigate the impact of such lineshape on both 3 and 20 dB linewidth and experimentally conduct a systematic study for 56-GBaud DP-QPSK and 28-GBaud DP-16QAM systems using a decision directed phase look loop algorithm. We show how carrier induced frequency noise has no impact on linewidth but a significant impact on system performance; which rises the question on whether 3-dB linewidth should be used as performance estimator for semiconductor lasers.

Place, publisher, year, edition, pages
2015.
Keyword [en]
Coherent communications, Optical communications, Phase noise, Digital signal processing, Frequency estimation, Linewidth, Metropolitan area networks, Monolithic integrated circuits, Optical communication, Signal processing, Carrier phase recovery, Coherent communication, Coherent transmission systems, Decision-directed, Monolithically integrated, Performance estimator, Semiconductor phase, Systematic study, Semiconductor lasers
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-167403DOI: 10.1117/12.2078408ISI: 000354523400009Scopus ID: 2-s2.0-84923917428ISBN: 9781628414783 (print)OAI: oai:DiVA.org:kth-167403DiVA: diva2:815220
Conference
Optical Metro Networks and Short-Haul Systems VII; San Francisco; United States; 10 February 2015 through 12 February 2015
Note

QC 20150608

Available from: 2015-05-29 Created: 2015-05-22 Last updated: 2017-11-08Bibliographically approved
In thesis
1. Impairment Mitigation in High Capacity and Cost-efficient Optical Data Links
Open this publication in new window or tab >>Impairment Mitigation in High Capacity and Cost-efficient Optical Data Links
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work presented in this thesis fits within the broader area of fiber optics communications. This is an important area of research as it provides a breeding ground for the present and future technologies supporting the Internet. Due to the ever-increasing bandwidth demands worldwide, the network infrastructures that make up the Internet are continuously being upgraded. This thesis aims to identify key segments of the Internet that are deemed to become the Internet's bottleneck if new technology does not replace the current one. These are datacenter intra and inter-connects, and metropolitan core area networks. In each category, we provide a comprehensive overview of the state of the art, identify key impairments affecting data transmission, and suggest solutions to overcome them.

 

For datacenter intra and inter-connects, the key impairments are lack of bandwidth from electro-optic devices, and dispersion. Solutions attempting to tackle these impairments must be constrained by cost and power consumption. The provided solution is MultiCAP, an alternative advanced modulation format that is more tolerable to dispersion and provides bandwidth management features, while being flexible enough to sacrifice performance in order to gain simplicity. MultiCAP was the first advanced modulation format to achieve over 100~Gb/s in 2013 for a data-center interconnect and set the world record on data transmission over a single VCSEL in 2014 for a short reach data link. 

 

On metro-core networks, the challenge is to efficiently mitigate carrier induced frequency noise generated by modern semiconductor lasers. We point out that, when such lasers are employed, the commonly used laser linewidth fails to estimate system performance, and we propose an alternative figure of merit we name "Effective Linewidth". We derive this figure of merit analytically, explore it by numerical simulations and experimentally validate our results by transmitting a 28~Gbaud DP-16QAM over an optical link.

Place, publisher, year, edition, pages
Strockholm: KTH Royal Institute of Technology, 2017. 52 p.
Series
TRITA-FYS, ISSN 0280-316X ; 2017:12
Keyword
Phase Noise, Short range interconnects, Metro
National Category
Telecommunications
Research subject
Telecommunication
Identifiers
urn:nbn:se:kth:diva-208101 (URN)978-91-7729-308-8 (ISBN)
Public defence
2017-04-07, Hall B, Electrum, Kistagången 16, Kista, 10:00 (English)
Opponent
Supervisors
Projects
GRIFFON
Funder
EU, FP7, Seventh Framework Programme, 324391
Note

QC 20170602

Available from: 2017-06-02 Created: 2017-06-01 Last updated: 2017-06-02Bibliographically approved

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Iglesias Olmedo, MiguelSchatz, Richard

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