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

简介：Inthispaper,weproposeandexperimentallydemonstrateamethodtorealizeapolarizationdetectorbyusingacommerciallyavailablepolymethylmethacrylate(PMMA)pipe.Anasymmetricpolarization-relatedstructureisfabricatedbyetchingdifferentgratingstructuresontheexternalsurfaceofthepipe.Theresultsshowthatwhenthepiperotatesupto90°,thepeakofthetransmissionspectrumcanevidentlyshifttowardsthelowfrequency,whichmeansthepipewithgratingstructurescanserveasapolarizationdetector.Thisdesignpossessesthemeritsofasimplestructureandeasyfabrication.

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：这篇论文论述平面纤维布拉格栅栏(FBG)水中听音器探查察觉到原则，并且理论上并且试验性地研究探查结构敏感，收到的敏感频率反应特征和加速反应性质。平面表用不锈钢做的，它的厚度是0.15公羊，它的直径是空圆形的壳的15mm，和长度是20公羊。为结构的这种尺寸，探查结构敏感直到23fm/Pa，它是大约7300次赤裸的纤维的价值。回声频率是6.5kHz，和反应是的收到的敏感的振幅频率曲线相对在到5.5kHz的100Hz的频率范围以内的命令。一单位加速(1m/s2)产出的产量等价于(2.52～3.26Pa)声学的压力代理输出。这探查结构是容易的由multiplexingtechnique.The研究表演形成FBG水中听音器数组这平面结构能不仅形成FBG水中听音器探查，而且能组成光FBG激光水中听音器探查。结构能认识到不同带宽，不同范围由调整表的几何尺寸的声学的压力测量。

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：

简介：Oneofthemostbasiccharacteristicsofphotoniccrystalisfrequencybandgap.Whendefectsareintroducedintotheperiodicphotoniccrystal,anumberofdefectmodesappearinthestopband.Inthispaper,weexploittransfermatrixmethodbasedonphotoniccrystaltheory,andassumethesampledfiberBragggratingasone-dimensionaldualphotoniccrystalwithalargesizedefect.CharacteristicsofthesampledfiberBragggratingareanalyzed.ExperimentalresultsshowthatthesampledfiberBragggratinghasmanyreflectivepeaks.Itsreflectivity,centerwavelength,reflectivepeakintervalsandbandwidthallchangewiththegratingparameters,includinggratinglength,dutyratioofthematerialwithhighdielectricconstant,andindexmodulationdepthandperiod.Resultsagreewiththeconventiona1couplemodetheorywhichcanbeusedwhenanalyzingothercharacteristicsofthesampledfiberBragggratingorapplyingitintopractice.

简介：钻洞的方法是为测量剩余压力的最著名的方法之一。在一个标本识别未知飞机压力，一个圆形的洞首先在飞机应力下面在无限的板中被钻，然后，源于钻的洞的紧张被测量。紧张可以从在洞附近解释Moiré签名被获得。在穿过的栅栏Moiréinterferometry，水平、垂直的排水量地(u和v)能被获得到确定二块紧张地和一砍紧张地。在这篇论文，借助于Moiréinterferometry和作者开发的三个方向栅栏(栅栏插座)，三排水量回答(u，v和s)被获得获得三块紧张地。作为一个实际应用程序，钻方法的洞被采用为增强的铝和纤维测量消除紧张合成。它是一一步一步地方法；在各个走一个单身者把压成薄片或相等的深度被钻发现在钻的深度和在纤维减轻的剩余紧张之间的一些关系增强合成材料。

简介：Laguerre–Gaussianbeams,asaspecialmodelwithspiralphasestructure,havebeenintensivelyinvestigated.HolographicgratingmethodisaconvenientmethodofgeneratingLaguerre–Gaussianbeamsandmeasuringtheirorbitalangularmomenta.Butduetosomeinevitableadversefactorssuchaslateraldisplacement,angulardeflectionandellipticalincidentprofileofincidentbeam,thepracticaleffectivenessshouldbereevaluated.Thispaperisdevotedtothestudyontheinfluencesoftheabovementionedthreeadversefactorsontheholographicgratingmethod.Thecharacteristicsofthemodedecompositionofdiffractiveorderandtherelativepowersoftheorbitalangularmomentumeigen-statesarealsogiven.

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

简介：Themultiplexed-reflectivematchedfibergratinginterrogationtechniquewaspresentedinthispaper.Theinterrogationtechniquewasbasedontheuseoftwo(ormore)wavelength-matchedfiberBragggratings(FBGs)toreceivethereflectedsignalfromthesensingFBG.Thetwo(ormore)matchedgratingswerearrangedparallellyandusedasfilterstoconvertwavelengthintointensityencodedinformationforinterrogation.Theoreticalandexperimentalresultsdemonstratedthattheinterrogationsystemisimmunetothesourcefluctuationandcross-sensitivityeffectbetweentemperatureandstrain,andalsocanenlargethedynamicrange.

简介：Slowlight,atechnologytocontroltheopticalsignalbyreducingthegroupvelocity,hasbeenwidelystudiedtoobtainenhancednonlinearitiesandincreasedphaseshiftsowingtoitspromotingofthelight–matterinteractionability.Inthiswork,awidebandslowlightisachievedinasimpleone-dimensionalfishbonegratingwaveguide.Aflatbandindicatingslowlightwithagroupindexof13andbandwidthover10nmisobtainedbytheplanewaveexpansioncalculation,andthecorrespondingexperimentalresultsagreewellwiththetheoreticalprediction.Asteptaperisdesignedtocompensatethecouplingloss.Theproposedfishbonegratingwaveguideisagoodcandidateforwidebandslowlightdevicesinlightcommunication.

简介：基于长时期的纤维栅栏(LPFG)的双山峰回声，一个新奇电影传感器被介绍，在哪个对包围气体敏感的电影在反响的波长与这部电影改变的双山峰的纤维栅栏区域，和间隔的cladding上是涂的折射索引。根据夫妇模式理论，一个三元组穿着的数字模型被开发分析在敏感Sn和薄电影之间的关系光参数(电影厚度h3并且折射索引n3)并且纤维栅栏参数(栅栏时期螞和核心索引调整蟽)。由使用优化方法，最佳的电影光参数和栅栏结构参数被获得。到这些电影的折射索引的这个计划的敏感被预言到的数字模拟表演是超过10?7。理论上的分析为实际高度敏感的电影传感器提供直接基础。