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High-capacity short-reach optical communications
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The global traffic is experiencing an exponential growth posing severe challenges to the communication networks in terms of capacity. As a future-proof technology fiber communication is widely implemented in different network segments, which can be categorized by transmission distance as long-haul and short-reach. This thesis focuses on the short-reach communication networks including fiber access network connecting the end users to the metro/core networks that covering tens of kilometers and optical datacenter network handling the traffic within the datacenter with distance up to a few kilometers. For fiber access networks, wavelength division multiplexing passive optical networks (WDM-PONs) assign a dedicated wavelength channel to each user guaranteeing high data rate. Dense channels enlarges the user count but makes the signals vulnerable to the wavelength drift. In this regard we propose two schemes based on optical frequency comb technique to generate stable carriers for WDM-PONs. Meanwhile, radio-over-fiber techniques allows the transmission of radio signals between central offices and the cells. Millimeter wave (MMW) over fiber, on the other hand, offer high bandwidth for future high capacity mobile access. We propose and experimentally demonstrate a palm-shaped spectrum generation where the high-power central carrier can be used for upstream transmission while multiple MMW bands are capable of transmitting different downstream data simultaneously. Regarding optical datacenter networks, passive optical interconnects (POIs) have been proposed as an energy-efficient solution since only passive optical components are used for server interconnection. However, the high insertion loss may result in a scalability problem. We develop a methodology that considers various physical-layer aspects, e.g., receiver types, modulation formats, to quantify the scalability of POIs. Both theoretical analyses and experimental measurements have been performed to assess the scalability of various coupler-based POIs.

Abstract [sv]

Den globala datatrafiken växer exponentiellt, både på grund av nya bandbreddskrävande applikationer och ökningen av antalet användare. Detta innebär en utmaning för kommunikationsnätens kapacitet. Fiberoptisk kommunikation är en framtidssäker teknik för att möta detta kapacitetsbehov och används redan i stor utsträckning i olika delar av näten. Beroende på överföringsavstånd, kan fibernät kategoriseras som långdistansnät eller nät med kort räckvidd. Denna avhandling behandlar nät med kort räckvidd, innefattande dels 1) accessnät som förbinder slutanvändarna till stadsnätet/ huvudnätet och typiskt omfattar tiotals kilometer, dels 2) optiska datanätverk som hanterar den interna trafiken inom datacenter med överföringsavstånd upp till ett par kilometer.För fiberaccessnät är en av de lovande teknikerna våglängdsmultiplexade passiva optiska nät (WDM-PON), där en dedicerad våglängdskanal tilldelas varje användare vilket garanterar hög datahastighet. Genom ett litet kanalavstånd så kan antalet användare i WDM-PON utökas men det gör samtidigt systemet känsligt för våglängdsdrift hos lasrarna. För att råda bot på detta, föreslår vi två system baserade på optisk frekvenskams-teknik. Vi validerar experimentellt att de kan generera stabila optiska bärvågor för WDM-PON. Radio-över –fiber-tekniken gör samtidigt det möjligt att sända radiosignaler över en lång sträcka och används därför i mobilsystem för överföring mellan centralstationen och radiocellerna. Millimetervågor (MMW) över fiber erbjuder ännu större modulationsbandbredd och är lovande för framtidens mobilradiosystem med hög kapacitet. I denna avhandling föreslår vi, och demonstrerar experimentellt, generation av ett frekvenskams-spektrum som är format som en handflata, där en central bärare med hög effekt (långfingret på handflatan) kan användas i radiocellerna för uppströms överföring, medan multipla MMW band (övriga fingrar) samtidigt kan överföra olika data nedströms. När det gäller nätverk för optiska datacenter, har passiva optiska interconnects (POI) föreslagits som en energieffektiv lösning, där endast passiva optiska komponenter används för ihopkoppling av servrarna. Höga inkopplingsförluster hos passiva optiska komponenter kan emellertid leda till allvarliga skalbarhetsproblem. I denna avhandling presenterar vi en nyutvecklad metod för att kvantifiera skalbarheten, vilken tar hänsyn till olika faktorer i det fysiska lagret som t.ex. mottagartyp och modulationsformat. Både teoretiska analyser och experimentella mätningar har utförts för att utvärdera skalbarheten hos olika kopplarbaserade POI.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. , 57 p.
Series
TRITA-ICT, 2016:33
Keyword [en]
optical communication, optical frequency comb, radio-over-fiber, optical interconnect
Keyword [sv]
fiberoptisk kommunikation, optisk frekvenskams, Radio-över –fiber, passiva optiska interconnects
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Information and Communication Technology
Identifiers
URN: urn:nbn:se:kth:diva-196580ISBN: 978-91-7729-177-0OAI: oai:DiVA.org:kth-196580DiVA: diva2:1047182
Public defence
2016-12-12, Sal B, Kistagågan 16, Kista, 10:00 (English)
Opponent
Supervisors
Note

QC 20161117

Available from: 2016-11-17 Created: 2016-11-16 Last updated: 2016-11-17Bibliographically approved
List of papers
1. Spacing Switchable Flat Broadband Optical Comb Generation Based on Cascaded Electro-optical Modulator
Open this publication in new window or tab >>Spacing Switchable Flat Broadband Optical Comb Generation Based on Cascaded Electro-optical Modulator
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2013 (English)Conference paper (Refereed)
Place, publisher, year, edition, pages
OSA - The Optical Society, 2013
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-196566 (URN)2-s2.0-84942369373 (ScopusID)978-155752989-3 (ISBN)
Conference
Asia Communications and Photonics Conference, ACP 2013; Beijing; China; 12 November 2013 through 15 November 2013
Note

QC 20161117

Available from: 2016-11-16 Created: 2016-11-16 Last updated: 2016-11-17Bibliographically approved
2. An Ultra-dense Optical Comb Based DWDM-OFDM-PON System
Open this publication in new window or tab >>An Ultra-dense Optical Comb Based DWDM-OFDM-PON System
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2014 (English)Conference paper (Refereed)
Abstract [en]

We proposed and demonstrated an ultra-dense optical comb based DWDM-OFDM-PON scheme. At the optical line terminal (OLT), a cost-effective optical frequency comb generator (OFCG) is proposed and achieved as the multi-wavelength optical source. The OFCG is capable to provide multiple channels with reconfigurable wavelength spacing for ultra-dense WDM-PON based access network. In our scheme, OFDMsignal with multi-level modulation will be encoded into the OFCG lines for the downstream transmission to enhance the spectral efficiency while the OFDM signal will be remodulated by OOK data for the upstream transmission due to its ease of implementation in optical network unit (ONU) side. In experiments, we demonstrated that 10 optical lines with 25 GHz channel spacing are generated and they were modulated by 2.5-GB/s QPSK-OFDM for the downlink signal transmission. We also demonstrated that the multiple wavelengths from the OFCG.

Place, publisher, year, edition, pages
Electromagnetics Academy, 2014
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-196577 (URN)2-s2.0-84911211447 (ScopusID)
Conference
Progress In Electromagnetics Research Symposium Proceedings
Note

QC 20161117

Available from: 2016-11-16 Created: 2016-11-16 Last updated: 2016-11-17Bibliographically approved
3. Palm-Shaped Optical Spectrum Generation for Fiber-Wireless Integrated Communication with Dual-Band Millimeter Wave
Open this publication in new window or tab >>Palm-Shaped Optical Spectrum Generation for Fiber-Wireless Integrated Communication with Dual-Band Millimeter Wave
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2014 (English)In: Asia Communications and Photonics Conference, ACPC 2014, Optical Society of America, 2014Conference paper (Refereed)
Abstract [en]

We proposed and demonstrated a simple cost-effective palm shaped spectrum generation based on DPMZM in order to simultaneously generating dual-band MMWs and optical carrier, offering an alternative in integration of fiber and wireless communication in indoor and inter-building environments.

Place, publisher, year, edition, pages
Optical Society of America, 2014
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-196575 (URN)2-s2.0-84928902555 (ScopusID)978-155752852-0 (ISBN)
Conference
Asia Communications and Photonics Conference 11-14 November 2014, Shanghai, China
Note

QC 20161117

Available from: 2016-11-16 Created: 2016-11-16 Last updated: 2016-11-18Bibliographically approved
4. Palm-shaped spectrum generation for dual-band millimeter wave and baseband signals over fiber
Open this publication in new window or tab >>Palm-shaped spectrum generation for dual-band millimeter wave and baseband signals over fiber
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2016 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 367, 137-143 p.Article in journal (Refereed) Published
Abstract [en]

In order to offer abundant available bandwidth for radio access networks satisfying future 5G requirements on capacity, this paper proposes a simple and cost-effective palm-shaped spectrum generation scheme that can be used for high capacity radio over fiber (RoF) system. The proposed scheme can simultaneously generate an optical carrier used for upstream and two bands of millimeter wave (MMW) that are capable of carrying different downstream data. The experiment results show that the proposed palm-shaped spectrum generation scheme outperforms optical frequency comb (OFC) based multi-band MMW generation in terms of upstream transmission performance. Furthermore, simulation is carried out with different dual-band MMW configurations to verify the feasibility of using the proposed spectrum generation scheme in the RoF system.

Place, publisher, year, edition, pages
Elsevier, 2016
Keyword
Millimeter wave (MMW) communication, Radio over fiber (RoF), Palm-shaped spectrum generation
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-183299 (URN)10.1016/j.optcom.2016.01.044 (DOI)000370127300020 ()2-s2.0-84955268193 (ScopusID)
Note

QC 20160309

Available from: 2016-03-09 Created: 2016-03-07 Last updated: 2016-11-16Bibliographically approved
5. Scalability Analysis of Coupler Based Optical Interconnects
Open this publication in new window or tab >>Scalability Analysis of Coupler Based Optical Interconnects
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(English)In: IEEE Photonics Journal, ISSN 1097-5764, E-ISSN 1943-0655Article in journal, Letter (Other academic) Submitted
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-196664 (URN)
Note

QC 20161117

Available from: 2016-11-17 Created: 2016-11-17 Last updated: 2016-11-17Bibliographically approved
6. To Overcome the Scalability Limitation of Passive Optical Interconnects in Data centres
Open this publication in new window or tab >>To Overcome the Scalability Limitation of Passive Optical Interconnects in Data centres
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2016 (English)Manuscript (preprint) (Other academic)
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-196572 (URN)
Conference
Asia Communications and Photonics Conference
Note

QC 20161117

Available from: 2016-11-16 Created: 2016-11-16 Last updated: 2016-11-17Bibliographically approved
7. Performance evaluation of PAM and DMT for short-range optical transmission with high speed InGaAsP DFB-TWEAM
Open this publication in new window or tab >>Performance evaluation of PAM and DMT for short-range optical transmission with high speed InGaAsP DFB-TWEAM
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2016 (English)In: 2016 Optical Fiber Communications Conference and Exhibition, OFC 2016, Institute of Electrical and Electronics Engineers (IEEE), 2016Conference paper (Refereed)
Abstract [en]

We report on experimental results of 56-Gb/s OOK, PAM4 and 25-Gb/s DMT transmission with a high speed InGaAsP based monolithically integrated DFB-TWEAM, and evaluate different digital equalization implementations.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2016
Keyword
Light transmission, Optical fibers, Pulse amplitude modulation, Digital equalization, High Speed, InGaAsP, Monolithically integrated, Optical fiber communication
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-194976 (URN)000382938100198 ()2-s2.0-84986199030 (ScopusID)9781943580071 (ISBN)
Conference
2016 Optical Fiber Communications Conference and Exhibition, OFC 2016, 20 March 2016 through 24 March 2016
Note

QC 20161110

Available from: 2016-11-10 Created: 2016-11-01 Last updated: 2016-11-16Bibliographically approved
8. Experimental Validation of Scalability Improvement for Passive Optical Interconnect by Implementing Digital Equalization
Open this publication in new window or tab >>Experimental Validation of Scalability Improvement for Passive Optical Interconnect by Implementing Digital Equalization
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2016 (English)Conference paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-196564 (URN)
Conference
European Conference and Exhibition on Optical Communications
Note

QC 20161117

Available from: 2016-11-16 Created: 2016-11-16 Last updated: 2016-11-17Bibliographically approved
9. First Demonstration of Real-Time 100 Gbit/s 3-level Duobinary Transmission for Optical Interconnects
Open this publication in new window or tab >>First Demonstration of Real-Time 100 Gbit/s 3-level Duobinary Transmission for Optical Interconnects
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2016 (English)Conference paper (Refereed)
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-196573 (URN)
Conference
European Conference and Exhibition on Optical Communications
Note

QC 20161117

Available from: 2016-11-16 Created: 2016-11-16 Last updated: 2016-11-17Bibliographically approved

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