简介：Theeffectsofhighdrawingspeedsonparametersofholeyfibersarepresented.Aholeyfiberpreformstructurewasmadebyusingtube-in-tubemethodandwasdrawnathighspeedswithanaimofmassproductiontomeetthedemandofnextgenerationcommunicationsystems.Transmissionparameterssuchasnumericalapertureandnormalizedfrequencyofthefabricatedholeyfibershavebeenmeasuredandcomparedwiththeoreticalvaluesbasedoneffectiveindexmethod.Althoughthefabricatedholeyfiberswerenotofhighquality,theanalysesoftheparametershaveshownpromisingoutlookforfabricationofsuchfibers.

简介：Asthewavelengthdivisionmultiplexing(WDM)technologymaturesandthedemandsforbandwidthincrease,survivabilitybecomesmoreandmoreimportantingeneralizedmulti-protocollabelswitching(GMPLS)controlledintelligentopticalnetworks(IONs).Therearegreatintereststostudytheperformanceofrestorabilityunderonecertainconnectionmanagementstrategy.Andstudiesintheproblemofprovidingrecoveryfromlinkfailuresundertwodifferentresourcereservationschemes,forwardreservationprotocols(FRPs)andbackwardreservationprotocols(BRPs),arepresented.Theyareexaminedfromthepointofviewofconnectionblockingprobability,restorabilityandaveragerecoverytime.Thetwodifferentconnectionmanagementschemesandthesurveyofdifferentrecoveryschemesarefirstpresented.Theperformanceoftheserecoverystrategiesisanalyzedandcomparedboththroughtheoreticalanalysisandsimulationresults.ThemainstressedideaisthatusingBRPsgivesthebestperformanceintermsofrestorabilityandblockingprobabilityinrestorableGMPLSnetworks.