Monolithically integrated coherent comb de-multiplexer using facetless semiconductor ring lasers

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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.reasonThis thesis is due for publication or the author is actively seeking to publish this materialen
dc.check.typeNo Embargo Required
dc.contributor.advisorPeters, Frank H.en
dc.contributor.authorDernaika, Mohamad
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2019-09-24T10:33:10Z
dc.date.available2019-09-24T10:33:10Z
dc.date.issued2019
dc.date.submitted2019
dc.description.abstractDue to the growing demand for faster Internet connections and the growth of services requiring high bandwidths, the migration of the networks to higher and higher bit rates is inevitable. The surge in data usage due to real time application in the entertainment, business and medical sector has placed tremendous pressure on the current infrastructure and its ability to keep up with the constant traffic increase. Wavelength division multiplexing (WDM) systems, which currently dominate long-haul optical transmission links employ guard bands between channels to avoid interference. This leads to inefficient use of the system bandwidth, which is limited by the erbium doped fibre amplifier (EDFA). A solution to this problem is to use coherent WDM (Co-WDM), or called optical orthogonal frequency division multiplexing (OFDM) to increase the bandwidth efficiency. In Co-WDM or optical OFDM, the interference from adjacent orthogonal channels can be eliminated at the receiver end. Therefore, the spacing between adjacent channels can be reduced without using guard bands. Moreover, the series of individual lasers used in WDM networks can be replaced with a single coherent comb source. However, Co-WDM still requires the use of discrete bulky components, such as narrow band filters to operate as a comb demultiplexer, modulators and multiplexer. To justify the potential move from WDM to Co-WDM a significant reduction in cost, size and production time is necessary. The photonic integrated circuit (PIC) offers an attractive solution to integrate all components on a single chip. The vision of the larger research project was to design and fabricate a fully integrated Co-WDM transceiver. The initial demonstration PIC will comprise an integrated coherent comb generator, a comb filter and an integrated electro-absorption modulator (EAM). However, this work mainly focused on the filter aspect of the PIC to demultiplex the narrowly spaced comb lines (<25 GHz). The filter has two functions: to demultiplex the comb lines, and to selectively amplify the individual comb line through injection locking. The filter is designed to be facet-less so that it can be suitable for integration with other devices. The fabrication process of the PIC employs Standard UV lithography and a regrowth-free process to further reduce the time, cost and complexity making it suitable for mass production. The process of optimizing the facet-less lasers in term of fabrication yield, consistency and filtering performance will be presented.en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Version
dc.format.mimetypeapplication/pdfen
dc.identifier.citationOther, A. N. 2019. Monolithically integrated coherent comb de-multiplexer using facetless semiconductor ring lasers. PhD Thesis, University College Cork.en
dc.identifier.endpage108en
dc.identifier.urihttps://hdl.handle.net/10468/8602
dc.language.isoenen
dc.publisherUniversity College Corken
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Investigator Programme/13/IA/1960/IE/Injection locking within Photonic Integrated Circuits supporting high spectral density optical communications/en
dc.rights© 2019, Mohamad Dernaika.en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.subjectMonolithic integrationen
dc.subjectPhotonic integrationen
dc.subjectCoherent optical comben
dc.subjectRing lasersen
dc.subjectDemultiplexingen
dc.subjectOptical filteren
dc.subjectInjection lockingen
dc.subjectSingle mode laseren
dc.subjectTunable semiconductor laseren
dc.subjectRegrowth freeen
dc.subjectSemiconductor laseren
dc.subjectCoherent WDMen
dc.subjectOptical OFDMen
dc.subjectElastic networksen
dc.subjectOptical communicationsen
dc.subjectTerabit communicationsen
dc.thesis.opt-outfalse
dc.titleMonolithically integrated coherent comb de-multiplexer using facetless semiconductor ring lasersen
dc.typeDoctoral thesisen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhDen
ucc.workflow.supervisorf.peters@ucc.ie
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