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dc.contributor.authorKanprachar, Suracheten_US
dc.date.accessioned2014-03-14T20:09:16Z
dc.date.available2014-03-14T20:09:16Z
dc.date.issued2003-03-14en_US
dc.identifier.otheretd-04102003-143201en_US
dc.identifier.urihttp://hdl.handle.net/10919/26744
dc.description.abstractThis dissertation focuses on the use of subcarrier multiplexing (SCM) in multimode fibers, utilizing carrier frequencies above what is generally utilized for multimode fiber transmission, to achieve high bit rates. In the high frequency region (i.e., frequencies larger than the intermodal bandwidth), the magnitude response of multimode fiber does not decrease monotonically as a function of the frequency but is shown to become relatively flat (but with several deep nulls) with an amplitude below that at DC. The statistical properties of this frequency response at high frequencies are analyzed. The probability density function of the magnitude response at high frequencies is found to be a Rayleigh density function. The average amplitude in this high frequency region does not depend on the frequency but depends on the number of modes supported by the fiber. To transmit a high bit rate signal over the multimode fiber, subcarrier multiplexing is adopted. The performance of the SCM multimode fiber system is presented. The performance of the SCM system is significantly degraded if there are some subcarriers located at the deep nulls of the fiber. Equalization and spread spectrum techniques are investigated but are shown to be not effective in combating the effects of these nulls. To cancel the effects of these deep nulls, training process and diversity coding are considered. The basic theory of diversity coding is given. It is found that the performances of the system with training process and the system with diversity coding are almost identical. However, diversity coding is more appropriate since it requires less system complexity. Finally, the practical limits and capacity of the SCM multimode fiber system are investigated. It is shown that a signal with a bit rate of 1.45 Gbps can be transmitted over a distance up to 5 km.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartSurachet_Kanprachar_Dissertation_1.pdfen_US
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectMultimode Fibersen_US
dc.subjectSubcarrier Multiplexing (SCM)en_US
dc.subjectTraining Processen_US
dc.subjectOptical Fiber Transmissionen_US
dc.subjectDiversity Codingen_US
dc.titleModeling, Analysis, and Design of Subcarrier Multiplexing on Multimode Fiberen_US
dc.typeDissertationen_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineElectrical and Computer Engineeringen_US
dc.contributor.committeechairJacobs, Iraen_US
dc.contributor.committeememberStolen, Roger Hallen_US
dc.contributor.committeememberPratt, Timothy J.en_US
dc.contributor.committeememberShaw, John Kennethen_US
dc.contributor.committeememberWang, Anboen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04102003-143201/en_US
dc.date.sdate2003-04-10en_US
dc.date.rdate2004-04-11
dc.date.adate2003-04-11en_US


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