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Calculations and Measurements of Raman Gain Coefficients of Different Fiber Types

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dc.contributor.authorKang, Yuhongen
dc.contributor.committeechairStolen, Roger Hallen
dc.contributor.committeememberJacobs, Iraen
dc.contributor.committeememberSafaai-Jazi, Ahmaden
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:30:21Zen
dc.date.adate2003-01-10en
dc.date.available2014-03-14T20:30:21Zen
dc.date.issued2002-12-09en
dc.date.rdate2004-01-10en
dc.date.sdate2003-01-10en
dc.description.abstractFiber Raman amplification using the transmission line is a promising technology to increase the repeater distance as well as the capacity of the communication systems. Because of the growing importance of fiber Raman amplification, it is desired to predict the magnitude and shape of the Raman gain spectrum from the doping level and refractive index profiles of different fiber designs. This thesis develops a method to predict the Raman gain coefficients and spectra for a pure silica core fiber and two different types of GeO2-doped silica fibers given their index profiles. An essential feature of the model is the inclusion of the variation in Raman gain coefficient over the mode field due to the variation in the Ge concentration across the fiber core. The calculated Raman gain coefficients were compared with measurements of the peak Raman gain on a step-index GeO2-doped fiber and with published measurements from various sources. Agreement between the calculated and measured peak gain for the step-index fiber was excellent. There was qualitative agreement with published measurements but there were significant differences between the calculated and published gain coefficients, which are not understood. Part of the work sought a way of predicting Raman gain coefficients from a standard gain curve given only the fiber type and the effective area. This approach appears promising for moderately-doped fibers with the proper choice of effective area.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-01102003-020757en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01102003-020757/en
dc.identifier.urihttp://hdl.handle.net/10919/30878en
dc.publisherVirginia Techen
dc.relation.haspartThesis_Kang.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjecteffective Raman gain and Raman gain coefficienten
dc.subjectstimulated Raman scatteringen
dc.subjectGeO2 concentrationen
dc.subjectFiber Raman amplifieren
dc.titleCalculations and Measurements of Raman Gain Coefficients of Different Fiber Typesen
dc.typeThesisen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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