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1、InternationalJournalofAdvancedScienceandTechnologyVol.41,April,2012HarmfulEffectsofGammaIrradiationonOpticalFiberCommunicationSystemLinksunderThermalEnvironmentEffectsAhmedNabihZakiRashedElectronicsandElectricalCommunicationEngineeringDepartmentFacultyofElectronicEngineering,Menouf3295
2、1,MenoufiaUniversity,EGYPTahmed_733@yahoo.comTel.:+2048-3660-716,Fax:+2048-3660-716AbstractThispaperhasinvestigatedtheharmfuleffectsofGammairradiationonfibercommunicationsystemlinksunderthermalenvironmenteffectsoverwiderangeoftheoperatingparameters.Boththeambienttemperatureandtheirradi
3、ationdosepossesssevereffectsonthesystemtransmissionlinkcharacteristicsandconsequentlytheperformancecharacteristicsofopticalcommunicationsystems.Aswellaswehavedeeplydevelopedthemodellingbasicsoftransmissioncommunicationsystems,whichmaybeusedtoanalyzedthetotaldispersionforfirstandsecondo
4、rders,systemrisetime,3-dBbandwidth,transmittedsignalbandwidth,transmissionbitratesandproductsusingdifferenttransmissiontechniquesoftheseirradiatedopticaltransmissioncommunicationsystemsafterdifferentirradiationfluences.Keywords:Gammaradiations,Thermaleffects,opticalcommunicationsystem,
5、RadiationdamageandFiberlink1.IntroductionThetransmissioncharacteristicsofopticalfiberareverymuchinfluencedinradiationenvironmentduetogenerationofradiationinduceddefectcentersbyionizationandatomicdisplacementwithinthemolecularbondingnetworkofsilica(SiO2)glass[1,2].Thegenerateddefectcent
6、erscauseabsorptioninultraviolet(UV),visible(VIS)ornearinfrared(IR)regionandareresponsibleforradiationsensitivityofthefiber.Theradiationinducedlossinopticalfiberdependslargelyoncorecladcomposition,dopantconcentration,fiberdesignalongwithdifferentradiationparameterslikeradiationsource,do
7、serateandoperatingparametersliketemperature[3-5],transmissionwavelengthetc.Lotofworkhasbeencarriedouttostudytheradiationeffectonopticalfibersandtheassociateddefectcentregenerationwiththeobjectiveofusingthefiberastransmissionmediuminradiationenvironmentwhichrequiresittoberadiationresi
