简介：ThecalculationprincipleofsampledFBG,whichiscalledtransfermatrixmethod,isanalyzedandthesimulationsoftwareisdesigned.ThesampledFBGissimulatedwiththesoftwarewedesignedandisfabricatedbyourselves.Theexperimentresultfitswellwiththesimulatedone.ItisconcludedthattoimprovetherefractivemodulationindexisaneffectivewaytofabricateasampledFBGwithhigh-reflectivity.

简介：A2-cmlongBragggratingwithreflectivityof～99.95%inB/Gecodopedopticalfiberwithouthydrogenloadingwascreatedbyphase-maskmethodwithapulsedKrFexcimerlaserat248nm.DCandACcomponentsofrefractiveindexchangewereanalyzedbymonitoringtransmissionspectrumevolutionduringthewritingprocessoffiberBragggrating.Therelationsoftheevolutionofcenterwavelengthandreflectivitywithnumberofpulseswererespectivelyinvestigated.

简介：MultiwavelengthchirpedfiberBragggrating(MCFBG)isamorevaluableapproachtochromaticdispersioncompensation.AndadjustingthestructureofFBGwilloptimizetheperformanceofdispersioncompensatorin8×10Gb/sDWDMnetwork,whichisprovedbysimulatingcalculation.

简介：Theoperationprincipleofanarrayedwaveguidegrating(AWG)multiplexerisintroducedandthe4×4AWGwithfollowingdesignparametersisdiscussedindetail,suchasthechoiceofwavelength,theneighboringarrayedwaveguidedistanceΔL,thechannelfrequencyintervalΔf,andthefreespectralrange.Thestructureof4×4AWGisdesignedandtheresultofstimulatedtestisalsogiven.Analysisshowsthatthe4×4AWGischaracterizedbyawidedynamicrange,lowcrosstalk,betterspectrumproperties,andacompactstructure.

简介：Inthispaper,theangularspreadoftheSAWbeamdiffractedbyBragggrating,denotedbyδθ1,isana-lysedbasedontheequationsofthedeflectionangleandthedeflectioneffciency.AparameterδθBisde-finedtoreferto"Braggangularspectrumwidth"ofthegrating.Theimportanceofthisparameterindis-tinguishingtheangularspreadrangeofthedeflectedbeamfordifferentregimesisdiscussedaswell.Itisshowfromtheanalysisthatifthespreadangleoftheincidentbeamlabelledwithδθincislargethanthe"Braggwitdthoftheangularspectrum"ofthegrating,thespreadangleδθ1ofthedeflectedbeamwillequaltoδθB;butiftheangulardivergenceoftheincidentbeamislessthanδθB,thenδθ1=δθincExperimentally,fourkindsofsampleswithdifferentconfigurationsareinvestigatedbyopticalmethod,twoofwhichoperateintheregimeofδθinc<<δθBandtheotherscorrespondtothecaseintheregimeofδθinc>>δθB.Thewidthsoftheangularspreadoftheinciden

简介：Usingthematrixapproach,weanalyzedtherelationbetweenthelocationofthetransmissioninstopbandandthephaseshift,anddiscussedtheproblemofvaryingthebandwidthofthetransmissionwindow.Thesetheoreticaltesultsinthispaperhaveimportantsignificanceforactualapplicationofthephase-shiftedfibergrating.

简介：AnoveltunablechirpedfiberBragggratingtechnologyisproposedandsimulatednumericallybyMatlab.Ifweadhereauniformfibergratingwithsupermagnetostrictivefilmandexposetheminanon-uniformmagneticfield,theperiodofthegratingcanbechangedwiththestrainimposedonitbythemagnetostrictiveeffect.Thechirpedcharacteristicscanbetunedbychangingthemagneticfiledwhichisveryflexibleindesigning.

简介：AkindoffiberBragggratingpressuresensorbasedoncorrugateddiaphragmisproposed.TherelationshipbetweenthecentralwavelengthofreflectivewaveofFBGandpressureisgiven,andtheexpressionofthepressuresensitivitycoefficientisalsogiven.Withintherangefromresultsagreewiththetheoreticalanalysis.Itisindicatedthattheexpectedpressuresensitivityofthesensorcanbeobtainedbyoptimizingthesizeandmechanicalparametersofthecorrugateddiaphragm.

简介：当它在察觉到的fiberBragg栅栏(FBG)被使用时，波长部门multiplex有明显的优点因为各种各样的数量的同时的测量，而是传感器的数字被小橇和解调器的带宽通常限制。相同纤维Bragggrating为火报警系统被介绍，收集相同FBGsensors的信号的方法被描述。实验结果显示出那，相同FBG察觉到。传感器的数字极大地在一纤维增加联合了，精确能被保证为火报警系统满足要求。

简介：TheshearlagtheoryisusedtoanalyzethestresstransferfromconcretematrixtoFBGsensorsbasedonthattheFBGsensorandtheconcretematrixarecomposite.Thestresstransferformulaandthecoefficientareobtained.Theexperimentsprovethatthetheoreticalresultsofthestresstransferbythestresstransferformulaareinwellagreementwiththeexperimentaldata.

简介：ThemethodtopumptheFBGwrittenintoanEr3+-dopedopticalfiberisproposedtoincreasethegroupvelocityofaprobingpulsebasedonthefactsthatpump-inducedprocesschangestherefractiveindexanddispersionassociatedwiththe4I15/2-4I13/2transitioninEr3+-dopedopticalfiber.Thesystemequationsarederived.Theeffectsofpumppoweranddopingconcentrationonthegroupvelocityarediscussed.

简介：Thewavelengthtuningragesofagratingexternal-cavitylaserdiode(ECLD)havebeenstudiedbytheequivalentavitymethod.Themaximumtuningrange(MTR)andthecontinuoustundingrange(CTR),whicharerelatedtothemaximumandtheminimumthresholdcarrierdensities,arededucedfromthethresholdcondition.WedefinearatiooftheCTRtotheMRT.ThisratioisonlydeterminedbythereflectivitiesoftheexternalandinternalfacetsoftheECLD.TheanalysisshowsthatthereisanappropriatecombinationoftheexternalandinternalcavityreflectivitestoobtainagivenCTRinthedesignofanECLD.

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简介：ThespectraoffiberBragggrating(FBG)ininhomogeneousstrainfieldsaredistortedduetoitsinhomogeneityofboththeperiodsandtheeffectiverefractiveindex.ThecouplemodetheoryandtheRunge-KuttamethodcanbeemployedforexactsimulationofthespectrumofBragggratinginsuchfield,buttheconvergencespeedisslow.Ontheotherhand,althoughthetransfermatrixmethodcouldbeusedwithhigherconvergencespeed,theprecisionispoorbecauseoftheneglectofthegradsofstrainchange.ByimprovingtheFBGequivalentperiod,anovelsimulationmethodbasedonamodifiedtransfermatrixmethodisproposed,whichhastheadvantageofquick-convergenceaswellasgoodaccuracy.

简介：EmployingafiberFabry-Perot(FFP)interferometerhasbeenconsideredasatrianglenotchfiltertodemodulatethewavelengthoffiberBragggrating(FBG)sensor.Thesingleparameterofstrainhasbeendemodulated,andthecross-sensitivityinfluenceoftemperaturehasbeeneliminated.Theprincipleofthismethodissimpleandeasytobeimplemented,andhasbeenusedtodesigna30tfibergratingweightbridgesuccessfully.Themaximaltemperaturedrifterroroftheweightbridgeis4με,whichmeansthatthefullscaleerroris8‰.Theresultrevealsthattheaccuracyishighenoughtobeusedinmeasurement.

简介：ThecharacteristicsofspecialapodizedfiberBragggrating(FBG)inflat-toppass-bandasreflectivityfilterarepresented.ThisspecialapodizedFBGwasdesignedbytheparticleswarmoptimizationalgorithm.ComparedwithconventionalapodizedFBG,thespecialapodizedFBGpresentedwasmorerobustintheflat-toppass-bandcharacteristicevenifthestrengthofgratingisveryweek.Thistechnologyisveryinterestingindesigningthefilterforwavelengthdivisionmultiplexingsystem.

简介：

简介：Startingfrompiezoelectriccrystaldynamicequationetc.,boththeelectricpotentialandsurfacechargeinducedbytheincidentwaveareobtainedwithelectricalboundaryperturbationtechnique.Thescatteredwavesarethenderivedincludingbothsurfaceandbulkwavesthroughintegraltransformationwiththeinducedchargeasexcitingsource.ThescatteredsurfacewavesfromthegratingonYZ-LiNbO3arethennumericallycalculated,andboththereflectiveandforwardscatteringcoefficientsaregivenvs.thestripwidth.Furthermore,thesurfacewavephasevelocitychangewhenpassingthegratingisderivedandnumericallycalculatedtoo.Thetheoreticalpredictionagreeswellwithmeasuredresults.

简介：RelationofopticalpropertiesinauniformfiberBragggrating(FBG)withitsgratingparametersandthelaserbeamengravingconditionsisanalyzed.TheprincipleandmethodfordesigningtheuniformFBGusedindensewavelengthdivisionmultiplexing(DWDM)systemisgiven.Byadoptingthedoubleexposuretechnique,withauniformphasemaskandGaussianlaserbeam,theuniformFBGusedinDWDMsystemisdesignedandengraved,whosebandwidthofthemainreflectionbandisabout0.4nmand0.7nmat-5dBand-25dBrespectively.

简介：扁平的回答有40隧道和0.8nm(100GHz)的基于硅石的穿的波导栅栏(美国线规)隧道间距被设计了并且制作了在输入波导的结束使用multimode干涉仪(MMI)。MMI的合适的宽度理论上用横梁繁殖方法(BPM)被优化。有16渭m宽度MMI的一个美国线规试验性地被制作。测量结果证明3dB带宽是0.62nm，插入损失()从5.2dB到7.5dB，并且串音是不到鈥?0dB。3dB带宽，隧道数字和AWG的隧道间距与模拟价值同意很好。CLC数字TN253文件代码A由中国的国家自然科学基础支持了(号码60477035，号码60507006)并且科技鈥?的部73鈥?计划(没有。G2000036602）