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Impairment Mitigation in High Capacity and Cost-efficient Optical Data Links
KTH, School of Engineering Sciences (SCI), Applied Physics, Optics and Photonics, OFO.ORCID iD: 0000-0002-8543-4531
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 [en]
Phase Noise, Short range interconnects, Metro
National Category
Telecommunications
Research subject
Telecommunication
Identifiers
URN: urn:nbn:se:kth:diva-208101ISBN: 978-91-7729-308-8 (print)OAI: oai:DiVA.org:kth-208101DiVA: diva2:1104325
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
List of papers
1. Multiband Carrierless Amplitude Phase Modulation for High Capacity Optical Data Links
Open this publication in new window or tab >>Multiband Carrierless Amplitude Phase Modulation for High Capacity Optical Data Links
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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.

Keyword
Fiber optics communication, multiband carrierless amplitude phase modulation (MultiCAP), short range communications
National Category
Telecommunications Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-141713 (URN)10.1109/JLT.2013.2284926 (DOI)000330128500010 ()2-s2.0-84893405396 (Scopus ID)
Note

QC 20140221

Available from: 2014-02-21 Created: 2014-02-21 Last updated: 2017-06-01Bibliographically approved
2. Towards 100 Gbps over 100m MMF using a 850nm VCSEL
Open this publication in new window or tab >>Towards 100 Gbps over 100m MMF using a 850nm VCSEL
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2014 (English)In: 2014 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), [Olmedo, Miguel Iglesias; Tatarczak, Anna; Estaran, J.; Monroy, Idelfonso Tafur] Tech Univ Denmark DTU, Dept Photon Engn, DK-2800 Lyngby, Denmark. [Zuo, Tianjian; Xu, Xiaogeng] Huawei Technol Co Ltd, Transmiss Technol Res Dept, Shenzhen 518129, Peoples R China. [Olmedo, Miguel Iglesias] Royal Inst Technol KTH, Opt Div, Electrum 229, SE-16440 Kista, Sweden., 2014Conference paper, Published paper (Refereed)
Abstract [en]

Employing MultiCAP signaling, successful 70.4 Gbps transmission over 100m of OM3 MMF using off-the-shelf 850 nm VCSEL with 10.1 GHz 3-dB bandwidth is experimentally demonstrated indicating the feasibility of achieving 100 Gbps with a single 25 GHz VCSEL.

Place, publisher, year, edition, pages
[Olmedo, Miguel Iglesias; Tatarczak, Anna; Estaran, J.; Monroy, Idelfonso Tafur] Tech Univ Denmark DTU, Dept Photon Engn, DK-2800 Lyngby, Denmark. [Zuo, Tianjian; Xu, Xiaogeng] Huawei Technol Co Ltd, Transmiss Technol Res Dept, Shenzhen 518129, Peoples R China. [Olmedo, Miguel Iglesias] Royal Inst Technol KTH, Opt Div, Electrum 229, SE-16440 Kista, Sweden.: , 2014
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-174268 (URN)000361020300028 ()2-s2.0-84907406041 (Scopus ID)978-1-55752-993-0 (ISBN)
Conference
Optical Fiber Communications Conference and Exhibition (OFC), MAR 09-13, 2014, San Francisco, CA
Note

QC 20151009

Available from: 2015-10-09 Created: 2015-10-02 Last updated: 2017-06-02Bibliographically approved
3. Carrier recovery techniques for semiconductor laser frequency noise for 28 Gbd DP-16QAM
Open this publication in new window or tab >>Carrier recovery techniques for semiconductor laser frequency noise for 28 Gbd DP-16QAM
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2015 (English)In: Optical Fiber Communication Conference, OFC 2015, IEEE , 2015Conference paper, Published paper (Refereed)
Abstract [en]

We report on the first experimental comparison of DD-PLL, two-stage feed forward, and two variations of extended Kalman filtering for tracking semiconductor laser frequency noise. We identify which carrier phase recovery technique works best depending on the carrier induced frequency noise profile.

Place, publisher, year, edition, pages
IEEE, 2015
Keyword
Optical communication, Optical fiber communication, Optical fibers, Carrier induced, Carrier phase recovery, Carrier recovery, Experimental comparison, Extended Kalman filtering, Feed forward, Frequency noise, Semiconductor laser frequency, Semiconductor lasers
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-177235 (URN)000370976400162 ()2-s2.0-84930921546 (Scopus ID)9781557529374 (ISBN)
Conference
Optical Fiber Communication Conference, OFC 2015, 22 March 2015 through 26 March 2015
Note

QC 20151125

Available from: 2015-11-25 Created: 2015-11-17 Last updated: 2017-06-01Bibliographically approved
4. Digital signal processing approaches for semiconductor phase noise tolerant coherent transmission systems
Open this publication in new window or tab >>Digital signal processing approaches for semiconductor phase noise tolerant coherent transmission systems
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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.

Keyword
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:nbn:se:kth:diva-167403 (URN)10.1117/12.2078408 (DOI)000354523400009 ()2-s2.0-84923917428 (Scopus ID)9781628414783 (ISBN)
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: 2017-06-01Bibliographically approved
5. Effective Linewidth of Semiconductor Lasers for Coherent Optical Data Links
Open this publication in new window or tab >>Effective Linewidth of Semiconductor Lasers for Coherent Optical Data Links
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2016 (English)In: PHOTONICS, ISSN 2304-6732, Vol. 3, no 2, 39Article in journal (Refereed) Published
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
Keyword
coherent communications, fiber optics communications, laser linewidth
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-192767 (URN)10.3390/photonics3020039 (DOI)000381860000028 ()
Note

QC 20160926

Available from: 2016-09-26 Created: 2016-09-20 Last updated: 2017-06-01Bibliographically approved

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