Modeling, Analysis, and Design of Subcarrier Multiplexing on Multimode Fiber

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dc.contributor.authorKanprachar, Suracheten
dc.contributor.committeechairJacobs, Iraen
dc.contributor.committeememberStolen, Roger Hallen
dc.contributor.committeememberPratt, Timothy J.en
dc.contributor.committeememberShaw, John Kennethen
dc.contributor.committeememberWang, Anboen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:09:16Zen
dc.date.adate2003-04-11en
dc.date.available2014-03-14T20:09:16Zen
dc.date.issued2003-03-14en
dc.date.rdate2004-04-11en
dc.date.sdate2003-04-10en
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
dc.description.degreePh. D.en
dc.identifier.otheretd-04102003-143201en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04102003-143201/en
dc.identifier.urihttp://hdl.handle.net/10919/26744en
dc.publisherVirginia Techen
dc.relation.haspartSurachet_Kanprachar_Dissertation_1.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectMultimode Fibersen
dc.subjectSubcarrier Multiplexing (SCM)en
dc.subjectTraining Processen
dc.subjectOptical Fiber Transmissionen
dc.subjectDiversity Codingen
dc.titleModeling, Analysis, and Design of Subcarrier Multiplexing on Multimode Fiberen
dc.typeDissertationen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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