Photoinduced Fresnel reflectors in germanium-doped optical fibers

dc.contributor.authorPlante, Angela J.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:38:38Zen
dc.date.adate2009-06-16en
dc.date.available2014-03-14T21:38:38Zen
dc.date.issued1994en
dc.date.rdate2009-06-16en
dc.date.sdate2009-06-16en
dc.description.abstractA novel method of fabricating low reflectance mirrors has been developed based on the photosensitivity of hydrogen-loaded, germanium-doped optical fibers. Using a side-writing technique, point-wise refractive index changes have been induced in the core of Ge-doped optical fibers via ultraviolet light from a high power excimer laser. These refractive index changes cause Fresnel reflections at the boundary of the higher photoinduced index change and the lower index in the unexposed core. The boundary of the two refractive indices may be considered a low reflectance mirror. Several techniques have been explored to characterize the Fresnel reflectors including optical time domain reflectometry (OTDR) and spectral analysis. In-line, optical fiber Fresnel reflectors have applications as internal mirrors in intrinsic Fabry-Perot interferometric (IFPI) sensors and OTDR distributed strain sensors. Photoinduced IFPI sensors have performed well as temperature sensors, strain sensors, and vibration sensors. Improved manufacturing techniques are also discussed for future developments. The photoinduced IFPI sensor is inexpensive to manufacture and involves little skill, in contrast to the labor-intensive fabrication techniques of conventional IFPI sensors. The IFPI sensor has commercial applications in embedded structures, high temperature environments, and situations with large EMI conditions.en
dc.description.degreeMaster of Scienceen
dc.format.extentviii, 60 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06162009-063318en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06162009-063318/en
dc.identifier.urihttp://hdl.handle.net/10919/43334en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.P555.pdfen
dc.relation.isformatofOCLC# 32290641en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.P555en
dc.subject.lcshFresnel lensesen
dc.subject.lcshOptical fibersen
dc.titlePhotoinduced Fresnel reflectors in germanium-doped optical fibersen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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