Temperature Dependent Behavior of Optical Loss from Hydrogen Species in Optical Fibers at High Temperature

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dc.contributor.authorBonnell, Elizabeth Annen
dc.contributor.committeechairPickrell, Gary R.en
dc.contributor.committeememberHoma, Daniel S.en
dc.contributor.committeememberWinkler, Christopheren
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2017-06-13T19:44:11Zen
dc.date.adate2015-07-30en
dc.date.available2017-06-13T19:44:11Zen
dc.date.issued2015-04-07en
dc.date.rdate2015-07-30en
dc.date.sdate2015-05-20en
dc.description.abstractThis study reports on the behavior of silica based optical fibers in a hydrogen environment at high temperatures. The hydrogen response in the form of optical loss in the wavelength range of 1000-2500 nm of a germanium doped graded index 50/125 graded index fiber was examined in the temperature range of 20–800 °C. When the fiber was exposed to hydrogen at 800 °C two absorption bands appeared: ~1390 nm assigned to the first overtone of the hydroxyl stretch and ~2200 nm band with complex assignments including the combination mode of the fundamental hydroxyl stretch with SiO4 tetrahedral vibrations and the combination mode of SiOH bend and stretch. The growth rate of the 1390 nm band fits the solution to the diffusion equation in cylindrical coordinates while the 2200 nm band does not. Absorption for both bands persisted as the fiber is cooled to room temperature. Temperature dependent behavior was observed in that as temperature increases from room temperature, the absorption intensity decreases and band shifts slightly to longer wavelengths. Temperature dependence is repeatable and reversible. However, if no hydrogen is present in the environment at temperatures greater than 700 °C, the 1390 nm band will permanently decrease in intensity, while the 2200 nm band does not change. Changes in the structure of the glass appear to be causing this temperature dependent behavior. Other necessary conditions for structural changes to cause this temperature dependent behavior are examined.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-05202015-113311en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05202015-113311/en
dc.identifier.urihttp://hdl.handle.net/10919/78132en
dc.language.isoen_USen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectInfrared Spectroscopyen
dc.subjectDiffusionen
dc.subjectGlass Structureen
dc.subjectOH Speciesen
dc.subjectTemperature Dependenceen
dc.subjectFiber Opticsen
dc.subjectHydrogenen
dc.titleTemperature Dependent Behavior of Optical Loss from Hydrogen Species in Optical Fibers at High Temperatureen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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