Monolithic integration of photonic devices for use in a regrowth-free coherent WDM transmitter

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dc.contributor.advisor Peters, Frank H. en
dc.contributor.advisor Corbett, Brian en Kelly, Niall P. 2018-04-05T10:25:45Z 2017 2017
dc.identifier.citation Kelly, N. 2017. Monolithic integration of photonic devices for use in a regrowth-free coherent WDM transmitter. PhD Thesis, University College Cork. en
dc.identifier.endpage 144 en
dc.description.abstract In this communication age, consumer internet traffic continues to grow at an exponential rate year on year. As a result, networks need to be continually upgraded to keep up with ever increasing bandwidth demands. Diverse research is currently being undertaken at a global level to produce cost effective solutions to maximize network performance. One such area focuses on the development of photonic integrated circuits (PICs), striving to replicated the same compact design and low power consumption achieved in the electronics industry. However, photonic components are more complex and diverse than their electrical equivalents, such as transistors. As these components can have large footprints, involve multiple electrical contacts and require different material properties for optimal performance, the best approach is not obvious when cost is considered. While platforms such as heterogenous integration and monolithic regrowth have produced PICs with advance functionality, they rely on complex fabrication processes which increase production time and cost. As a result, this thesis proposes a monolithic regrowth-free design for a coherent WDM transmitter which requires less sophisticated fabrication techniques and would therefore be more cost effective to manufacture than alternative methods. The work began with the development of suitable processes for the fabrication of DC and high-speed components associated with the transmitter. Utilizing the associated composite hard mask process, the integration of core components required for the coherent WDM transmitter was undertaken. The monolithic integration of a 1x2 multimode interference coupler, two slotted Fabry-Perot (SFP) lasers, two electroabsorption modulators (EAMs) and a star coupler was demonstrated using regrowth free epitaxy and UV contact lithography. The feasibility of integrating an SFP laser with an EAM by means of injection locking was also investigated, resulting in the production of a 2.5 Gbps eye diagram. It was shown that the high-speed performance of these PICs could be improved by using more advanced modulator designs. As a result, this thesis concludes with an investigation of high speed modulators with the aim of to increase the data rate of the developed PICs. An integratable electroabsorption modulator with a 3 dB bandwidth of 17.5 GHz and a corresponding 12.5 Gbps eye diagram was realized. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2017, Niall Kelly. en
dc.rights.uri en
dc.subject Photonics en
dc.title Monolithic integration of photonic devices for use in a regrowth-free coherent WDM transmitter en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en
dc.description.version Accepted Version
dc.contributor.funder Science Foundation Ireland en
dc.description.status Not peer reviewed en Physics en Tyndall National Institute en
dc.check.reason This thesis is due for publication or the author is actively seeking to publish this material en
dc.check.opt-out No en
dc.thesis.opt-out false
dc.check.embargoformat E-thesis on CORA only en
dc.internal.conferring Summer 2018 en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2276/IE/I-PIC Irish Photonic Integration Research Centre/ en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Investigator Programme/13/IA/1960/IE/Injection locking within Photonic Integrated Circuits supporting high spectral density optical communications/ en

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© 2017, Niall Kelly. Except where otherwise noted, this item's license is described as © 2017, Niall Kelly.
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