简介:Aspectroscopicmethodtodeterminethicknessofquartzwaveplateispresented.Themethodisbasedonchromaticpolarizationinterferometry.Withthepolarization-resolvedtransmissionspectrum(PRTS)curve,thephaseretardationofquartzwaveplatecanbedeterminedatawidespectralrangefrom200to2000nmobviously.ThroughaccuratejudgmentofextremepointsofPRTScurveatlong-waveband,thephysicalthicknessofquartzwaveplatescanbeobtainedexactly.Wegiveameasuringexampleandtheerroranalysis.Itisfoundthatthemeasuringprecisionofthicknessismainlydeterminedbythespectralresolutionofspectrometer.
简介:Manyapproachesforhigh-resolutionimagereconstructionhavebeenproposedinsomeliteratures.Oneofthemostcommonlywaysistoreconstructahigh-resolutionimagefromanumberofrotatedandtranslatedimageswithlowresolution.Inthisprocess,theexposuredifferenceamongoriginalimageswilldecreasethequalityofthereconstructedimage.Inordertoremovetheinfluenceoftheexposuredifference,alightenergymatchingmethodisproposedinthispaper.Thetheoreticalanalysisisillustratedindetails.Experimentalresultsshowthatthetheoreticalanalysisiscorrectandtheproposedmethodisvalid.
简介:Anewtechnologyoflightninglocationisdescribed,whichisbasedondetectingthestateofpolarization(SOP)fluctuationofthelaserlightintheopticgroundwire(OPGW).Comparedwiththeconventionallightninglocationmethod,thenewmethodismoreaccurate,morestable,andcheaper.TheoriesofStokesparametersandPoincaresphereareintroducedtoanalyzetheSOPatthelightningstrikepoint.ItcanbeconcludedthatalthoughtheinitialpointsofSOPonthePoincarespherearerandom,theSOPfluctuationgeneratedbylightningstrikecanstillbeaccuratelyidentifiedbydetectingthevelocityofpolarizationmotion.Anewalgorithmtoquantifythevelocityisalsointroduced.
简介:Toachievelowerassemblydelayatopticalburstswitchingedgenode,thispaperproposesanapproachcalledcurrentweightlengthprediction(CWLP)toimproveexistingestimatemechanisminburstassembly.isintroducedtomakeadynamictradeoffbetweenthecurrentandpasttrafficunderdifferentoffsettime.SimulationresultsshowthatCWLPcanachieveasignificantimprovementintermsoftrafficestimationinvariousoffsettimeandofferedload.
简介:Photoniccrystalfibers(PCFs)withasteppedraised-coreprofileandonelayerequallyspacedholesinthecladdingareanalyzed.Usingeffectiveindexmethodandconsideringaraisedsteprefractiveindexdifferencebetweentheindexofthecoreandtheeffectiveindexofthecladding,weimprovethecharacteristicparameterssuchasnumericalapertureandV-parameter,andreduceitsbendinglosstoaboutonetenthofaconventionalPCF.ImplementingsuchastructureinPCFsmaybeonestepforwardtoachievelowlossPCFsforcommunicationapplications.
简介:Acarriermethodforseparatingout-of-planedisplacementfromin-planecomponentsbasedonlargeimage-shearingshearographyispresented.Areferencesurfaceisfixedonthesideofatestobject.Theyareilluminatedbytwoexpandedsymmetricilluminationsrespectively.Thecarrierisintroducedbyrotatingthereferencesurfacetomodulatethedisplacementofanobject.ByusingFouriertransformtodemodulatethemodulatedfringepattern,twophasemaps,whichincludeout-of-planeandin-planedisplacements,canbeobtained.Thentheout-of-planedisplacementcanbeeasilyseparatedfromin-planedisplacementbysubtractionandadditionofthetwounwrappedphasedistributions.Theprincipleofthemethodispresentedandprovedbyatypicalthree-point-bendingexperiment.Experimentalresultsshowthatthemethodenjoyshighvisibilityofcarrierfringes.Thesystemdoesnotneedaspecialbeamasareferencelightandhassimpleopticalsetup.更多还原
简介:Alowcost8×10-Gb/stransmissionsystemover1500kmonconventionalfiberusingchirpedfiberBragggrating(CFBG)asdispersioncompensatorisdemonstrated.Thebiterrorrate(BER)below10-10at1500kmisobtained.Thechannelspacingis0.8nmandtheopticalamplifierspacingis100km.Only16erbium-dopedfiberamplifiers(EDFAs)areused.