以就业为导向的信息管理专业人才培养模式研究区域经济均衡发展对高校毕业生就业的影响及对策VIP免费

19Optimizationoflong-periodgratinginscribedinlargemodeareaphotoniccrystalfiberfordesignofbandstopfilterOriginalResearchArticleOptik-InternationalJournalforLightandElectronOptics,Volume122,Issue1,January2011,Pages58-62FaramarzE.Seraji,S.Farsinezhad,LeilaChehreghaniAnzabiClosepreview|Relatedarticles|RelatedreferenceworkarticlesAbstract|Figures/Tables|ReferencesAbstractByinscribinglongperiodgrating(LPG)inaphotoniccrystalfiber(PCF),opticalfiltersforcommunicationwavelengthscanbefabricated.Inthispaper,byutilizingcoupled-modetheoryandenhancedimprovedvectorialeffectiveindexmethod,adesignofbandstopfilterbasedonoptimalLPGparametersispresentedwheretheoptimizedfull-widthhalf-maximum(FWHM),thenumber(N)andtotallengthofgratingsofLPGs(L)aredetermined.Asaresult,bythedeterminationofoptimizedLPGparameterswithanoptimumlengthofLopt=6.5mmandoptimumnumberofgratingNopt=27inscribedinthePCF,abandstopopticalfilterwithFWHM=1nmisdesigned.ArticleOutline1.Introduction2.Determinationofgratingperiod3.Transmissionresponseofstopbandfilter4.ConclusionAcknowledgementsPurchaseReferences20Efficientmulti-hopschedulingalgorithmsforpackettransmissionsinWDMopticalstarnetworksOriginalResearchArticleAEU-InternationalJournalofElectronicsandCommunications,Volume64,Issue12,December2010,Pages1186-1191Hann-JangHoClosepreview|Relatedarticles|RelatedreferenceworkarticlesAbstract|Figures/Tables|ReferencesAbstractThispaperproposesmulti-hopschedulingalgorithmsfortheAll-to-AllBroadcast(AAB)probleminWavelengthDivisionMultiplexed(WDM)opticalstarnetworks.Themulti-hopAABproblemcanbesplitintotwosubproblems:LogicalTopologiesConstruction(LTC)problem,andTransmissionScheduling(TS)problem.Forimprovingtheefficiencyofmulti-hopscheduling,wefocusonanewmulti-hoptransmissionmodelandtransfertheLTCproblemtoaspecialcaseoftheRoundRobinTournament(RRT)problem.Intheproposedlogicaltopologies,ourmulti-hopschedulingalgorithmscaneasilyoverlapthetuninglatencyandreducethenumberoftuningoperationsoneachnode.Wecompareourresultswithpreviousresearchintermsofschedulelength.Overallresultsindicatethatourmulti-hopschedulingalgorithmshavebetterperformancethanpreviousalgorithms.ArticleOutline1.Introduction2.Problemdefinition3.Logicaltopologiesconstruction3.1.Solvingtheρ-LTCproblemPurchase3.2.Transfertotheroundrobintournament(RRT)problem3.3.LogicaltopologiesconstructionalgorithmsLTC-EvenalgorithmLTC-Oddalgorithm4.PackettransmissionschedulingTransmissionscheduling(TS)algorithmOverlappedtransmissionscheduling(OTS)algorithm5.ConclusionAcknowledgementsReferencesVitae21VCSELtransmissionat10Gb/sfor20kmsinglemodefiberWDM-PONwithoutdispersioncompensationorinjectionlockingOriginalResearchArticleOpticalFiberTechnology,Volume17,Issue1,January2011,Pages41-45T.B.Gibbon,K.Prince,T.T.Pham,A.Tatarczak,C.Neumeyr,E.Rönneberg,M.Ortsiefer,I.TafurMonroyClosepreview|Relatedarticles|RelatedreferenceworkarticlesAbstract|Figures/Tables|ReferencesAbstractVerticalCavitySurfaceEmittingLasers(VCSELs)areextremelycosteffective,energyefficientopticalsourcesidealforpassiveopticalaccessnetworks.However,wavelengthchirpandchromaticdispersionseverelylimitVCSELperformanceatbitratesof10Gb/sandabove.Weexperimentallyshowhowoff-centerwavelengthfilteringoftheVCSELspectrumatanarraywaveguidegratingcanbeusedtomitigatetheeffectofchirpandthedispersionpenalty.Transmissionat10Gb/sVCSELover23.6kmofsinglemodefiber...