简介：AnopticalPPM-CDMAcommunicationsystemwithanopticalhard-limiterinfrontofthecorrelatorofareceiverisproposedinordertoreducemulti-userinterference.Theperformanceofthesystemisevaluatedwhentheeffectsofbothmulti-userinterferenceandphotodetectorshotnoiseareconsidered.Anupperboundonthebiterrorrateisderived.ThecomparisonoftheperformanceoftheabovereceiverwiththatoftheopticalPPM-CDMAsystemwithoutanopticalhard-limiterismade.Simulationresultsshowthattheperformanceofthesystemwithanopticalhard-limiterissuperiortothatoftheconventionalone.

简介：光安全设备在对伪造的战斗起一个必要作用。在这份报纸，我们学习并且设计光过滤器基于metameric完成的一双金属电介质，它在观察的一个特定的角度由颜色移动提供隐藏的图象效果。与所有电介质相比多层的系统，金属电介质多层的结构让更大的颜色与改变事件角度，更高的颜色浸透和少数变层。最后，有5层的栈和7层被完成，并且颜色差别索引仅仅是0.71，它显示出匹配效果的好metameric。同时，当厚度偏差是牥и时，到免职错误的过滤器的敏感被分析

简介：Opticaltimedivisonmultiplexing(OTDM)isoneofthepromisinigwaysforthefuturehigh-speedopticalfibercommunicationnetworks.All-opticalswitchis,beingoneofthecoretechnologiesofOTDMsystemsandnetorks,crucialtorealizethevaroussignalprocessesincludingtime-divisiondemultiplexing,packerswitching,all-opticalregeneratingandsoon.Thisthesismainlystudiesvariousall-opticalswitchtechnologiesandtheirutilizationinthefieldsofall-opticalsignalprocessingsintheOTDMsystemsandnetworks.Themainjobsarelistedasfollows.(1)Anovelall-opticalultrafastdemultiplexingschemeusingthesolitonself-trappingeffectinbirefringentfiberisproposed.(2)ThedemultiplexingperformanceoftheNonlinearOPticalLoopMirror(NOLM)isthoroughlyanalyzedanditsoptimizationisfurtherdiscussed.(3)Theperformanceanalysisandtheconfigurationoptimizationoftheall-opticalswitchesbasedontheSemiconductorOpticalAmplifier(SOA)aresystematicallypresented.Thespeedlimitationoftheall-opticalSOAswitchesinducedbythefastgaindepletionofSOAisdiscussed,Besides,anovelSOAswitchisproposed,whichadoptstheasymmetricMach-ZehnderInterferomerterconfiguration.(4)The8×2.5Gb/sOTDMexperimentaltransmissionsystemalong105kmstandardfiberisrealizedusingtheNOLMdemultiplexer.(5)TheNOLMswitchisusedtorealizetheall-optical3Rregenerationof2.5G/sReturn-to-Zerosignal.(6)ThefeasibilityandlimitationoftheallopticalSOApacketswitchisdiscussed.AndadevelopedMZIconfigurationofSOApacketswitchisfurthershowntoimprovethepackerswitchingperformance.Finally,anall-opticalpacketdroppingnodesuitableinthenetworkswithringorbusconfingurationandanall-opticalpacketswithcingnodeintheShuffleNetnetworksareproposedtoshowthefeasibilityofall-opticalpacketswitchingthroughcombiningtheall-opticalswitchesandthereasonablelogicdecisions.

简介：Thispaperpresentsanewmethodforrobustandaccurateopticalflowestimation.Thesig-nificanceofthisworkistwofold.Firstly,theideaofbi-directionalschemeisadoptedtoreducethemodelerrorofopticalflowequation,whichallowsthesecondorderTaylor'sexpansionofopticalflowequationforaccuratesolutionwithoutmuchextracomputationalburden;Secondly,thispaperestablishsanewopticalflowequationbasedonLSCM(LocalStructureConstancyModel)insteadofBCM(BrightnessConstancyModel),namelytheopticalflowequationdoesnotactonscalarbutontensor-valued(ma-trix-valued)field,duetothetworeason:(1)structuretensor-valuecontainslocalspatialstructureinformation,whichprovidesusmoreuseablecuesforcomputationthanscalar;(2)localimagestructureislesssensitivetoilluminationvariationthanintensity,whichweakensthedisturbanceofnon-uniformilluminationinrealsequences.Qualitativeandquantitativeresultsforsyntheticandreal-worldscenesshowthatthenewmethodcanproduceanaccurateandrobustresults.

简介：Windowcoatingusedforthebuildinginrecentyearsisdescribed.Importantdesignprinciples,practicalcoatingmaterials,andattainableopticalpropertiesforresearch-typecoatingsareintroduced.Discussioniscarriedoutonthespectrallyselectivecoatings,theelectrochromiccoatings,andthethermochromiccoatings.

简介：Inordertodecreasedispersionpenaltyandincreasetheopticalbandwidthefficiency,anopticalsingle-side-bandmodulation(SSBM)schemeinsub-carriermultiplexing(SCM)isproposed.TheprincipleoftheSSBMisanalyticallypresented,andaconfigurationforgeneratingopticalSSBsignalisproposedusingabalancedMach-Zehnderelectro-opticmodulator.

简介：Theanalyticalexpressionofbiterrorprobabilityinabalanceddifferentialphase-shiftkeying(DPSK)opticalreceiverconsideringnonlinearphasenoiseandEDFAASEnoiseisgiven,whichisveryusefultoestimatetheperformanceofDPSKbalancedandunbalancedreceiverinopticalcommunicationsystem.Throughanalysis,ifonlynonlinearphasenoiseisconsidered,boththebalanceandunbalancedreceivershavethesameperformances.ButifaddingtheASEnoiseofEDFA,thebalancedreceiverisbetter.

简介：一个新奇计划所有光并且门基于一个Fabry-Perot半导体，光放大器(FP-SOA)被建议，它的可行性被模拟验证。用这个计划，所有光并且门能与10dB的扑灭比率被认识到。扑灭比率上的脉搏间隔和脉搏宽度的影响也被调查。

简介：Onthebasisofthermalradiationfromsolidsurfacetomeaseuretem-perature,anewtwo-coloropticalfiberpyrometerisputforward.ItgetstwothermalradiationsignalsbythemethodofY-typeopticalfiberandnarrowbandfilterforindi-cationofthetemperature,SidiodeinusedforphotoelectricmeasurementandMCS-51single-chipmicrocomputerforsamplingandhandling.Thesystemcanoutputindigitalandcanprintoutinstantaneousvalue,peakvalueandvalley,Ithasmanyadvan-tagessuchasquickmeasurement,smallobjective,highprecision,highsensitivityandnon-emissivitycompensation.inaddition,thespecialcircuitofthispyrometerandthees-tablishmentofmathematicsmodelarediscussed.

简介：Thestudyontrichromaticopticalfiberradiationthermonetersisespecial-lyusefulforthenon-contactaccuratetemperaturemeasurementofthosemeatrialswiththeemissivitieschangingdramaticallywithwavelength.Onthebasisofthetrichomaticthermometryprinciple,theoperationwavelengthsofthethermometerareselectedpro-perlysoastocompensatetheemissivityinfluenceonmeasurementresulteffectively.Us-ing1×3branchingfibercuplerandnarrowbandfiltersignificantlyimprovesthein-strumentreliability.Theisstrumentisself-calibrated,multi-functionalandeasytouseduetoembodiedmicrocontrollerandsomeothertechiques.

简介：Thestructureofanintensitymodulationopticalfibersensorisintroduced.Theprincipleofthesensorwhichcandetectminordisplacementbyuseofminorcurveindarkgroundisdescribed.Complexexperimentshowsthatthemultimodeopticalfibernotonlyhastheabilitlyofdetectingthedisplacementoflessthan0.1nm,butalsoexhibitscharacteristicsofwidedynamicrangeandgoodlinearity.

简介：Inanormalousdispersionofmonomodeopticalfiber,opticalsolitonsareevolvedfromopticalpulseswhenthedispersionisbalancedbythenonlinearity.Undistortedtransmissioncanberealizedbyusingopticalsolitons,whichcanoffermuchgreaterthetransmissioncapacityandextendtherepeaterspacingofthefibercommunicationsystem.Themechanismofthegenerationofopticalsolitonsisexpounded.Afewformsofnonlineartransmissionequationareobtainedbyusingaconcisemethod.Thegeneralcompleteexpressionofelementarysolitonsolutionofthenonlineartransmissionequationwithoutlossisgiven,andthedesignofthesolitontransmissionsystemisdiscussed.

简介：Anewopticalfiberfluoropticthermometerbasedonthetemperature-fluoropticcharacteristicoffluoropticmaterialsispresented.Theratiotechniqueofintensitiesoffluorescentemissionlinesofcertainrareearthphosphorsisused,makingthemeasurementoftemperaturesofthesystemto0.5℃precision.Thecharacteristicsofthermometerarediscussedandtheexperimentresultsoftemperaturearegiven.

简介：Anewsetupofmeasuringtemperatureisdeveloped,whichtheprobeisamicro-powerconsumptiveonewithCMOScircuitandisdrivenbyopticalpower.Fortransmittingthemeasuredsignalandopticalsignalinalongdistance,thefibertechnologyisappliedinthissetup.

简介：Basedonthetheoryofthermalradiation,acontacttypeopticalfiberpyrometerappliedinICengineisputforward.Itiscomposedofthreeparts:ablackbodyprobe,opticalsystem,electricalprocesssystem.Thekeytechnologyofdesignisdiscussed.Experimentisgiventoprovethatthepyrometerhasmuchhigherresponsivespeed,distinguishabilityandmuchlongerrunninglifethanotherpyrometers.

简介：Anewopticalfiberfluorometricthermometerbasedonthetemperaturedependenceofthefluorescencelifetimeofphosphorisdescribed.Thephase-lockeddetection(PLD)systemisusedtomeasurefluorescencelifetime.Thecharacteristicsofthermmeterarediscussedandtheexperimentresultsaregiven.

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简介：Asimplesolutionforamultilayermetallicopticalwaveguidebytransformingitintoanequivalentthree-layerslabwaveguideispresented.Thedispersionrelationoftheequivalentthree-layerslabwaveguideissolvedbyusingasimpleiterativeformula.Thismethoditselfisexactandcanapproachanyaccuracydesired.Moreover,thenumericalresultsforfour-layerandfive-layerstructuresshowthatthesecond-ordersolutionisalsoaccurateenough.ItissimpleandhasthesameformofexpressionsforTEandTMmodesandfordifferentlayerstructures.

简介：Ｔｗｏ－ｃｏｌｏｒＯｐｔｉｃａｌＦｉｂｅｒＰｙｒｏｍｅｔｅｒ①ＷＡＮＧＬｉｔｉａｎ，ＳＨＡＮＧＬｉｐｉｎｇ（ＹａｎｓｈａｎＵｎｉｖｅｒｓｉｔｙ，Ｑｉｎｈｕａｎｇｄａｏ０６６００４，ＣＨＮ）Ａｂｓｔｒａｃｔ：Ｏｎｔｈｅｂａｓｉｓｏｆｔｈｅｒｍａｌｒａｄ...

简介：Asimpleinstrumentforthereal-timemeasurementofalgaeconcentrationandmappingdescribed.Theinstrumentusesapulsedshortarcxenonflashlampastheexcitedlightsources.Boththeexcitinglightandthefluorescencefromalgaechlorophyllaretransmittedalongafiberbundle.Themeasurementsensivitivityisanalyzedandtheexperimentresultisgiven.Theinstrumentispracticaltoin-situmeasurementatsea.