Dense wavelength division multiplexing at 2 μm for future optical communications

dc.check.embargoformatEmbargo not applicable (If you have not submitted an e-thesis or do not want to request an embargo)en
dc.check.infoNot applicableen
dc.check.opt-outNot applicableen
dc.check.reasonNot applicableen
dc.check.typeNo Embargo Required
dc.contributor.advisorGunning, Fatimaen
dc.contributor.authorKavanagh, Niamh
dc.contributor.funderIrish Research Councilen
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderSeventh Framework Programmeen
dc.date.accessioned2020-02-06T09:55:01Z
dc.date.available2020-02-06T09:55:01Z
dc.date.issued2019
dc.date.submitted2019
dc.description.abstractThe internet is ubiquitous in our lives today, enabling instantaneous access to information, increased international collaboration, and even real-time remote surgery. It has changed how we socialise and how we see the world. From 2017 to 2022, global internet traffic is forecasted to triple, creating severe pressure on optical communication systems. Delivering the capacity required to support this traffic presents significant challenges in terms of system design, device performance, and optical fibre capabilities. Novel solutions are needed now, if we are to meet the demands of the near future. While solutions to increase system capacity and bandwidth efficiency of optical communication systems at 1.55 µm is widely discussed in the literature, shifting transmission to the 2 µm wavelength window could open possibilities to new discoveries in optical components, improved bandwidth efficiency, innovative optical fibres, and other applications transcending beyond optical communications. This thesis explores opening the 2 µm transmission window for optical communications. The focus of this work investigates the feasibility of implementing dense wavelength division multiplexing (DWDM) systems at 2 µm, with key enabling technologies developed recently. Strained III-V materials can produce foundry-compatible 2 µm lasers and detectors. Hollow-core photonic band gap fibres (HC-PBGFs) can guide 2 µm light through air, offering potentially lower losses, reduced latency and higher power-handling capabilities (in comparison to standard silica fibre). Also, thulium doped fibre amplifiers (TDFAs) could offer bandwidth of up to ~30 THz in the 2 µm waveband (~double that of EDFAs at 1.55 µm). Contributions of this thesis include the demonstration of a 2 µm DWDM system with channel spacing of 100 GHz and system capacity above 100 Gbit/s, for the first time in this new transmission window. Further increasing the capacity of 2 µm DWDM systems requires improving the spectral efficiency, which can be accomplished by reducing the spacing between channels. While 50 GHz channel spacing is shown to be achievable with current technologies in the transmitter, insufficient filtering can be a barrier for implementation in the receiver. With this in mind, novel filtering technologies are required and optical injection locking (OIL) is investigated as a possible filtering solution. The first study of OIL using two slotted Fabry-Perot lasers at 2 µm is demonstrated, achieving a stable OIL bandwidth of ~7 GHz and OIL-induced single mode operation over a 15 GHz range.en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Version
dc.format.mimetypeapplication/pdfen
dc.identifier.citationKavanagh, N. 2019. Dense wavelength division multiplexing at 2 μm for future optical communications. PhD Thesis, University College Cork.en
dc.identifier.endpage193en
dc.identifier.urihttps://hdl.handle.net/10468/9617
dc.language.isoenen
dc.publisherUniversity College Corken
dc.relation.projectIrish Research Council (Government of Ireland Postgraduate Scholarship GOIPG/2014/637)en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2276/IE/I-PIC Irish Photonic Integration Research Centre/en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Career Development Award/13/CDA/2103/IE/Software Defined Control of Superchannel Transponders for super-Tb/s Elastic Optical Networks/en
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP1::ICT/258033/EU/Multi-mode capacity enhancement with PBG fibreMulti-mode capacity enhancement with PBG fibre/MODE-GAPen
dc.rights© 2019, Niamh Kavanagh.en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.subjectPhysicsen
dc.subjectPhotonicsen
dc.subjectOpticsen
dc.subjectOptical communicationsen
dc.subjectFibre opticsen
dc.subjectCommunication systemsen
dc.subjectFabry Perot Lasersen
dc.subject2000nmen
dc.subjectWavelength division multiplexingen
dc.subjectDense wavelength division multiplexingen
dc.subjectOptical injection lockingen
dc.subjectSlotted Fabry Perot lasersen
dc.thesis.opt-outfalse
dc.titleDense wavelength division multiplexing at 2 μm for future optical communicationsen
dc.typeDoctoral thesisen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhDen
ucc.workflow.supervisorfatima.gunning@tyndall.ie
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