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

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简介：我们准备了graphene氧化物(去)可饱和的吸收器(SA)成功地在光的效果下面通过光免职方法，它是的一条简单却有效的途径扔各种各样的材料到底层上，并且调查了影响光免职结果的几个因素去到光纤维结束上，包括(甲基methacrylate)(PMMA)poly，集中，轻紧张，轻模式，和免职预定。有效光学地扔了去保存它GO/PMMA合成形成保证的非线性也被表明。光免职准备的GOSA分别地与调整深度和6%和40%的nonsaturable损失显示出优异可饱和的吸收性质。

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简介：AnovelschemeofopticalpowerequalizationbasedonFabry-Perotsemiconductoropticalamplifier(FP-SOA)isproposed.BecauseofthegaincharacteristicofFP-SOA,real-timecontrollingmechanismaccordingtoinputopticalpowerisabortedinthescheme.Thesimulationsshowthat10-dBpulsepeakpowervariationcanbeclampedinlessthan1dB.Theinfluencesofinjectingcurrent,pulseperiods,andpulsewidtharediscussed.

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：一个串联缓冲区基于在半导体的非线性的极化旋转，光放大器被建议，它对在微微秒的缓冲时间的快重构合适。与建议缓冲区，六十不同缓冲区时间在2.5Gb/s被表明。

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.

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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：Weproposeandexperimentallydemonstrateanoveltypeofpolarizationrotatorthatiscapableofrotatingthepolarizationplaneofalinearlypolarizedlightatanydesiredangleineitherbroadornarrowspectralbandwidth.Therotatorcomprisesanarrayofstandardhalf-waveplatesrotatedatspecificangleswithrespecttotheirfast-polarizationaxes.Theperformanceoftherotatordependsonthenumberofindividualhalf-waveplates,andinthispaperweexperimentallyinvestigatetheperformanceoftwocompositerotatorscomprising6and10half-waveplates.

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简介：Amplitude,phaseandpolarizationareessentialparametersofanopticalfield.Inthepastdecade,withtheenhancementoftechniquesinmanipulatingphaseandpolarizationstatesincomplexopticalfields,opticalvorticesandvectorbeamsareinvestigatedinacloselycoupledfashionintermsofefficientbeamgenerationandmanipulation,stabletransmissionandnoveldetectionaimedatvariousapplications.Inthisspecialissue6invitedpapersdemonstrateanumberoftypicaltopicsinthefield,withemphasisonthevectorialbeamgenerationandopticalcommunicationsystemsutilisingorbitalangularmomentum(OAM).

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

简介：Opticalvorticesastopologicalobjectsexistubiquitouslyinnature.Inthispaper,bymakinguseoftheDuan'stopologicalcurrenttheory,weinvestigatethetopologyintheclosedandknottedopticalvortices.Thetopologicalinnerstructureoftheopticalvorticesareobtained,andthelinkingoftheknottedopticalvorticesisalsogiven.

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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。