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Effective Linewidth of Semiconductor Lasers for Coherent Optical Data Links
KTH. VPI Photon GmBH, Germany.ORCID iD: 0000-0002-8543-4531
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Fotonik och mikrovågsteknik, FMI.ORCID iD: 0000-0003-3056-4678
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2016 (English)In: PHOTONICS, ISSN 2304-6732, Vol. 3, no 2, 39Article in journal (Refereed) Published
Description
Abstract [en]

We discuss the implications of using monolithically integrated semiconductor lasers in high capacity optical coherent links suitable for metro applications, where the integration capabilities of semiconductor lasers make them an attractive candidate to reduce transceiver cost. By investigating semiconductor laser frequency noise profiles we show that carrier induced frequency noise plays an important role in system performance. We point out that, when such lasers are employed, the commonly used laser linewidth fails to estimate systemperformance, and we propose an alternative figure of merit that 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. Our investigations cover the use of semiconductor lasers both in the transmitter side and as a local oscillator at the receiver. The obtained results show that our proposed "effective linewidth" is easy to measure and accounts for frequency noise more accurately, and hence the penalties associated to phase noise in the received signal.

Place, publisher, year, edition, pages
MDPI AG , 2016. Vol. 3, no 2, 39
Keyword [en]
coherent communications, fiber optics communications, laser linewidth
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-192767DOI: 10.3390/photonics3020039ISI: 000381860000028OAI: oai:DiVA.org:kth-192767DiVA: diva2:974465
Note

QC 20160926

Available from: 2016-09-26 Created: 2016-09-20 Last updated: 2017-11-02Bibliographically 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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