Analysing curved optical waveguides using the finite difference beam propagation method

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dc.availability.bitstreamopenaccess
dc.contributor.advisorPeters, Frank H.en
dc.contributor.authorMurphy, Tommy
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2021-05-11T10:49:37Z
dc.date.available2021-05-11T10:49:37Z
dc.date.issued2020-09-01
dc.date.submitted2020-09-01
dc.description.abstractPhotonic integrated circuits (PICs) integrate optical components on a single semiconductor chip. As time has progressed, advances have been made allowing the components of these PICs to become smaller and smaller. It is now possible to place many of these components on a single PIC. As these components can contain, or be connected by, bending waveguides, it is desirable to make these waveguide bends with as small a radius of curvature as possible to allow many components to fit on the single PIC. Unfortunately, as the radius of curvature decreases, the power loss through the bend increases due to the waveguide’s fundamental mode shifting towards the outside of the bend, causing large loss from the transition between the straight and curved waveguides. The power from the shifted mode also leaks as the fields propagate through the bend. Therefore, the aim of this thesis was to reduce the loss caused by these bends at small radii of curvature, allowing the bends to take up less space on a PIC. This involved designing the waveguide bends to have curvature profiles other than the conventional circular waveguide bend. The propagating fields through the bends were then analysed by numerical simulations using a program utilising the 3D finite difference beam propagation method, which was created and optimised over the course of the research, to investigate if the different curvature profiles could reduce the loss caused by bends in ridge waveguides. It was found that much lower loss could be achieved for curved deep-etched ridge waveguides with small radii of curvature by designing the bend to have a section where the curvature of the waveguide linearly changes.en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMurphy, T. 2020. Analysing curved optical waveguides using the finite difference beam propagation method. MRes Thesis, University College Cork.en
dc.identifier.endpage132en
dc.identifier.urihttps://hdl.handle.net/10468/11275
dc.language.isoenen
dc.publisherUniversity College Corken
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2276/IE/I-PIC Irish Photonic Integration Research Centre/en
dc.rights© 2020, Tommy Murphy.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectCurved waveguidesen
dc.subjectIII-V semiconductorsen
dc.subjectBeam propagation methoden
dc.subjectLinear curvatureen
dc.subjectFinite difference methoden
dc.subjectShallow-etcheden
dc.subjectDeep-etcheden
dc.titleAnalysing curved optical waveguides using the finite difference beam propagation methoden
dc.typeMasters thesis (Research)en
dc.type.qualificationlevelMastersen
dc.type.qualificationnameMSc - Master of Scienceen
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