Low loss optical waveguides and polarization splitters with oxidized AlxGa1-xAs layers

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buir.advisorAydınlı, Atilla
dc.contributor.authorBek, Alpan
dc.date.accessioned2016-01-08T20:15:47Z
dc.date.available2016-01-08T20:15:47Z
dc.date.issued1998
dc.departmentDepartment of Physicsen_US
dc.descriptionAnkara : Department of Physics and the Institute of Engineering and Science of Bilkent University, 1998.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 1998.en_US
dc.descriptionIncludes bibliographical references leaves 90-94.en_US
dc.description.abstractLow propagation loss waveguides, operating at 1.55 fim optical wavelength, are fabricated utilizing oxidized AhGai_a;As layers. MBE grown multilayer semiconductor heterostructures are characterized before and after oxidation by ellipsometric techniques. In fabrication of optical waveguides, reactive ion etching method is used extensively. Loss measurements are performed, involving a fiber input-coupled laser source setup using Fabry-Perot resonance technique. Propagation loss of an AlGaAs based multilayer rib waveguide with oxidized AhG ai_3,As top layer is observed to reduce from 6 dB/cm to as low as 1 clB/cm lor TM and from 3.7 dB/cm to as low as 0.6 dB/cm for TE polarizations in the presence of metal electrodes on top of the rib. These results arc compared with loss measurements on standard rib waveguides. Polarization splitters are also fabricated with the same material. Effect of the oxide layer on the polarization splitter’s coupling length for TE and TM polarizations are measured. Polarization extinction ratios as high as 12.4 dB are obtained. Polarization extinction ratios are also attempted to be controlled by the use of electro-optic effect in Al.x,.Gai_a;As system. Only AC fields are found to be effective.en_US
dc.description.degreeM.S.en_US
dc.description.statementofresponsibilityBek, Alpanen_US
dc.format.extent[xi], 94 leaves, illustrationsen_US
dc.identifier.urihttp://hdl.handle.net/11693/18051
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectOptical lossen_US
dc.subjectwaveguideen_US
dc.subjectcoupleren_US
dc.subjectoxidationen_US
dc.subjectreactive ion etchingen_US
dc.subjectellipsometryen_US
dc.subjectFabry-Peroten_US
dc.subjectpolarization splitteren_US
dc.subject.lccQC661 .B45 1998en_US
dc.subject.lcshOptical wave guides.en_US
dc.subject.lcshWave guides.en_US
dc.titleLow loss optical waveguides and polarization splitters with oxidized AlxGa1-xAs layersen_US
dc.typeThesisen_US
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