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Multiband Carrierless Amplitude Phase Modulation for High Capacity Optical Data Links
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.ORCID iD: 0000-0002-8543-4531
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2014 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 32, no 4, 798-804 p.Article in journal (Refereed) Published
Abstract [en]

Short range optical data links are experiencing bandwidth limitations making it very challenging to cope with the growing data transmission capacity demands. Parallel optics appears as a valid short-term solution. It is, however, not a viable solution in the long-term because of its complex optical packaging. Therefore, increasing effort is now put into the possibility of exploiting higher order modulation formats with increased spectral efficiency and reduced optical transceiver complexity. As these type of links are based on intensity modulation and direct detection, modulation formats relying on optical coherent detection can not be straight forwardly employed. As an alternative and more viable solution, this paper proposes the use of carrierless amplitude phase (CAP) in a novel multiband approach (MultiCAP) that achieves record spectral efficiency, increases tolerance towards dispersion and bandwidth limitations, and reduces the complexity of the transceiver. We report on numerical simulations and experimental demonstrations with capacity beyond 100 Gb/s transmission using a single externally modulated laser. In addition, an extensive comparison with conventional CAP is also provided. The reported experiment uses MultiCAP to achieve 102.4 Gb/s transmission, corresponding to a data payload of 95.2 Gb/s error free transmission by using a 7% forward error correction code. The signal is successfully recovered after 15 km of standard single mode fiber in a system limited by a 3 dB bandwidth of 14GHz.

Place, publisher, year, edition, pages
2014. Vol. 32, no 4, 798-804 p.
Keyword [en]
Fiber optics communication, multiband carrierless amplitude phase modulation (MultiCAP), short range communications
National Category
Telecommunications Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-141713DOI: 10.1109/JLT.2013.2284926ISI: 000330128500010Scopus ID: 2-s2.0-84893405396OAI: oai:DiVA.org:kth-141713DiVA: diva2:698277
Note

QC 20140221

Available from: 2014-02-21 Created: 2014-02-21 Last updated: 2017-12-05Bibliographically 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, Miguel

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