Non uniform fast fourier transform technique to estimate the Stokes spectra for a fiber optic spectral polarimetry instrument

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dc.contributor.advisorMilner, Thomas E.
dc.creatorEnuganti, Prahlad Rao
dc.date.accessioned2023-08-18T00:21:24Z
dc.date.available2023-08-18T00:21:24Z
dc.date.issued2005-12-24
dc.description.abstractOptical Coherence Tomography (OCT) is an interferometric, noninvasive and noncontact imaging technology that can image biological tissues at micrometer-scale resolutions [1]. OCT detects the interference signal between back-reflected probe light and reference light passing through an interferometer. Unlike sound waves, light as a transverse wave has a polarization property that can be used to enhance contrast via Polarization Sensitive OCT (PS-OCT). The polarization state of a light field can always be completely characterized by a Stokes Vector. In the case of a fiber-optic spectral polarimetry instrument [2], output intensity is a superposition of the four Stokes spectra modulated at different carrier frequencies dependent on phase retardations in polarization maintaining (PM) fiber segments. A simple Fourier transform of the output intensity isolates each Stokes spectral component in the time-delay or optical path length difference domain. The carrier frequency of each Stokes spectral component scales with the length of PM fiber segments and if their lengths are too short, the Stokes parameter components with different carrier frequencies overlap in the optical path length difference domain and cannot be demodulated. During the course of this study, several approaches were studied to tackle the problem of demodulating the Stokes parameters when interfering with each other. The results of the experiments performed using the various methods presented in chapter 4 suggest that the Non uniform fast Fourier transform provides the best result and shows most promise for estimating the Stokes spectra of FOSPI dataen_US
dc.description.departmentElectrical and Computer Engineeringen_US
dc.format.mediumelectronicen_US
dc.identifier.urihttps://hdl.handle.net/2152/121150
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/47980
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.rights.restrictionRestricteden_US
dc.subjectOptical coherence tomographyen_US
dc.subjectStokes spectraen_US
dc.subjectFiber optic spectral polarimetry instrumenten_US
dc.subjectNon uniform fast fourier transformen_US
dc.titleNon uniform fast fourier transform technique to estimate the Stokes spectra for a fiber optic spectral polarimetry instrumenten_US
dc.typeThesisen_US
dc.type.genreThesisen_US
thesis.degree.departmentElectrical and Computer Engineeringen_US
thesis.degree.disciplineElectrical and Computer Engineeringen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science in Engineeringen_US

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