Analysing curved optical waveguides using the finite difference beam propagation method

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dc.contributor.advisor Peters, Frank H. en
dc.contributor.author Murphy, Tommy
dc.date.accessioned 2021-05-11T10:49:37Z
dc.date.available 2021-05-11T10:49:37Z
dc.date.issued 2020-09-01
dc.date.submitted 2020-09-01
dc.identifier.citation Murphy, T. 2020. Analysing curved optical waveguides using the finite difference beam propagation method. MRes Thesis, University College Cork. en
dc.identifier.endpage 132 en
dc.identifier.uri http://hdl.handle.net/10468/11275
dc.description.abstract Photonic 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.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2020, Tommy Murphy. en
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/ en
dc.subject Curved waveguides en
dc.subject III-V semiconductors en
dc.subject Beam propagation method en
dc.subject Linear curvature en
dc.subject Finite difference method en
dc.subject Shallow-etched en
dc.subject Deep-etched en
dc.title Analysing curved optical waveguides using the finite difference beam propagation method en
dc.type Masters thesis (Research) en
dc.type.qualificationlevel Masters en
dc.type.qualificationname MSc - Master of Science en
dc.internal.availability Full text available en
dc.description.version Accepted Version en
dc.contributor.funder Science Foundation Ireland en
dc.description.status Not peer reviewed en
dc.internal.school Physics en
dc.internal.conferring Summer 2021 en
dc.internal.ricu Tyndall National Institute 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.availability.bitstream openaccess


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© 2020, Tommy Murphy. Except where otherwise noted, this item's license is described as © 2020, Tommy Murphy.
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