简介：Thispaperdiscussesthedefinitionsandpropertiesoftwokindsoffundamentalsymmetricfunctions,whicharebasedonAND-OR-NOTalgebraicsystemandAND-ExclusiveORalgebraicsystem,respectively.Baseduponit,somemappingtransformationmethodsbetweentwokindsofexpansioncoefficientsofanarbitrarysymmetric,functioninthecompletesetoftwofundamentalsymmetricfunctions.

简介：在这份报纸，二功能的轻来源被推荐。它能两个都放大轻力量并且使解调波长信号。它的产量力量1000倍高于传统的宽带光来源(BBS)，它能使解调由处于1550nm的状况在带宽范围的30nm扫描波长的信号中央波长。这种轻来源有效地在FBG的更多点测量解决光能供应的问题并且简化察觉到测量的结构。CLC数字TP211.6

简介：Thispaperpresentsaschemetoidentifyandcompensatethetimingmismatchesbetweentwochannelsfortimeinterleavedphotonicanalog-to-digitalconverters(TIPADCs).Theimpactofelectro-opticsamplingisremovedbypreprocessingfirstly.ThenacalibrationmethodcombiningchoppingprocessingandaHilberttransformisproposedtoidentifythetimingmismatches,whichcanbefurthercompensatedbyusingvariousmaturecompensationalgorithms.Theprincipleoftheproposedmethodisderivedtheoretically.Theperformanceoftheschemeisanalyzedbysimulation.Theresultsshowthattheharmonicinducedbytimingmismatchescanbesuppressedbymorethan30dBusingtheproposedcorrectionscheme.

简介：BasedonEvans’spatialsmoothingpreprocessingscheme,anewapproachcalledtwo-directionspatialsmoothingpreprocessingmethodispresented.Itisprovedthatthedecorre-lation,theeffectiveapertureandthemaximumnumberofdistinguishablecoherentsignals(whenarraysizeisgiven)ofthenewmethodarebetterthanthoseoftheEvans’method.Simulationresultsgiveacomparisonbetweentheeigenvectorspectrumsproducedbythetwomethods.

简介：Anoveldesignofatwo-axisfaststeeringmirror(FSM)withpiezoelectricactuatorsisproposedforincoherentlaserbeamcombination.ThemechanicalperformanceoftheFSMistested.Theresultsshowthatthetiltingrangeofthemirrorisabout4mrad,andthe1st-orderresonancefrequencyisabout250Hz.Aself-designedgratingencoderistakenasthesensor,whichensurestheoptimalprecisionof10μrad.Thenovelmechanicaldesigncanmeettherequirementofengineeringinincoherentlaserbeamcombination.

简介：也就是，二维的光直角的代码(2-DOOC)的一个新家庭修改了二次的一致代码(MQCC)/optical直角的代码(OOC)被建议当波长跳跃和散布时间的模式，采用MQCC和OOC分别地。通过分析MQCC/OOC的表演，我们能看到MQCC/OOC的关联性质仍然是理想的。同时，我们的分析证明建议新代码家庭能比另外的代码得到更多的集的势并且能改进光代码分割的位错误率(BER)多重存取(OCDMA)有效地。

简介：Twoalkylsubstitutedpolythiophenederivatives:poly(3-hexylthiophene)(P3HT)andpoly(3-decylthiophene)(P3DT),havesynthesizedbyoxidationcouplingpolymerizationof3-alkylthiopheneusingiron(III)chlorideascatalystinchloroform.Whilebothpolymersinpurechloroformsolutionhavemaximumabsorptionatapproximatelysamewavelengthof440nm,theybehavedifferentlywithrespecttochangesobservedontheirUV-visibleandphotoluminescencespectrawhenthequalityofthepoorsolventischangedingoodsolvent(chloroform)/poorsolvent(methanol)mixtures.Withincreasingvolumefractionofmethanolinmixtures,theabsorptionspectraofP3HTandP3DTred-shift,peakingatmaximumwavelengthof495nm(P3HT)and510nm(P3DT).Furthermore,theabsorptionspectraofthetwopolymersinchloroformblue-shiftasthetemperaturerises.P3HTshows4.73nmblue-shiftsat50℃incontrasttothecaseat20℃,whileP3DTblue-shiftsabout5.04nm.Thephotoluminescencespectraofthetwopolymersinmixedsolutionarealsoinvestigated,whichshowthattheluminescencespectrashifttolongerwavelengthwithanaccompanyingdropinthePLintensityasmethanolisincreased.Theabsorptionandemissionspectraofthetwopolymersinapoorsolventandathinfilmaresimilar,whichindicatethatasimilarlongerconjugationlengthinthetwocases.Itcouldconcludethatthepolymersexistalmostthesameconformationsandaggregationsinbothapoorsolventandathinfilm.P3DTexhibitsmoresensitivespectraproperties(bigred-shiftsinbothabsorptionandluminescencespectrainpoorsolventsandlargeblue-shiftsathightemperature)withcontrasttoP3HT,whichimplythatlongsidealkylmayimprovethechromicpropertiesofthepolymer.

简介：All-opticalwavelengthconvertersareexpectedtobecomekeycomponentsinthefuturebroadbandnetworks.Hereatwo-segmentDFBlaserforthefirsttimeisusedasanall-opticalwavelengthconverter.Usingthislaser,all-opticalwavelengthconversionfrom1.3μmtp1.55μmisdemonstrated。

简介：有二个串联microring共鸣器和二U弯曲波导的一个XOR/XNOR光逻辑电路被建议。microring共鸣器用电镀物品光的聚合物做的并且通过线性电镀物品光的效果调制。二个电的信号被用于二microrings，并且同时的XOR和XNOR操作在二个不同操作模式被表明。我们也使用散布矩阵方法分析模拟输出系列，并且发现象00和11一样的不同输入能在某些波长在输出系列导致不同扑灭比率，尽管他们的数字产量是一样。

简介：NetworkCoding(NC)bringscorrelationbetweenthecodedsignalsfromdifferentsources,whichmakesthesystemmorevulnerabletothedecodeerroratrelay.ConventionalCyclicRedundancyCode(CRC)hasbeenimplementedforerrorbitdetection.However,itserrorcorrectionissimplyignored.Tofullyexploitthisfeature,thispaperproposesanoveljointLog-LikelihoodRatio(LLR)CRCerrormitigationforNCtwowayrelaychannel.SpecificthresholdsaredesignedtoestimatetheerrornumberofdatablockandidentifythosewhichcanberecoveredifthenumberiswithintheerrorcorrectionscopeofCRC.Weexaminetwomodesofthethresholds,onebasedontheaverageBitErrorRate(BER)ofsource-relaylink,whiletheotherbasedonthatofinstantaneousone.WeprovidethefullanalysisforthePair-wiseErrorProbability(PEP)performanceofthescheme.AvarietyofnumericalresultsarepresentedtorevealthesuperiorityoftheproposedschemetoconventionalCRCNCunderindependentRayleighfadingchannels.Moreover,theefficienciesoftheproposedthresholdsarealsovalidated.

简介：Theimagesobtainedbyalargeopticaldetectionsystem(>500mm)arealwaysblurredbyatmosphericturbulence.Toaddressthisblurring,anadaptiveopticalsystemisurgentlyneeded.Here,a1.3mvehicle-basedadaptiveopticalsystem(VAOS),locatedontheNasmythfocus,isinvestigated.Atwo-gradetip/tiltsteeringmirrorisusedtoeliminatetrackingjitterandatmospherictippingerror.Pupilmatchingandcooperationbetweenthedeformablemirrorandthewavefrontsensorareadoptedtoachievehigh-orderaberrationmeasurementandcorrectionviaclosed-loopcorrectionandtoallowthetelescopetoobtainhigh-qualityimaging.Fordifferentseeingconditionsandsitelocations,theVAOSachievesthesensingoverthewavelengthrangefrom0.5μmto0.7μmusingaShack-Harmannwavefrontsensorandthecorrectionwitha97-unitdeformablemirrorforanimagingspectrumrangefrom0.7μmto0.9μm.Moreover,themaximumdetectioncapabilityofthesystemisgreaterthanavisualmagnitudeof5,andtheangularimagingresolutionisbetterthan0.3".

简介：A2×2cross/barpolymerelectro-optic(EO)routingswitchisproposed,whichiscomposedoftwopassivechannelwaveguidesandtwoactiveEOpolymermicroringswithbendingradiusofonly13.76μm.Detailedstructure,theoryandformulationareprovidedtocharacterizetheoutputpoweroftheswitch.Forobtainingfundamentalmodepropagation,smallbendinglossandphase-matchingbetweenchannelwaveguideandmicroringresonator(MRR)waveguide,thestructuralparametersareoptimizedunderthewavelengthof1550nm.Analysesandsimulationsonoutputpowerandoutputspectraindicatethataswitchingvoltageof5Visdesiredtorealizetheexchangebetweencrossstateandbarstate,thecrosstalkundercrossstateandthatunderbarstateareabout28.8dBand39.9dB,respectively,andtheinsertionlossesunderthesetwostatesareabout2.42dBand0.13dB,respectively.ComparedwithourfourEOswitchesreportedbefore,thisdevicepossessesultra-compactsizeof0.233mm×0.233mmaswellaslowcrosstalkandinsertionloss,andthereforeitcanserveasagoodcandidateforconstructinglarge-scaleopticalroutersorswitchingarraysinphotonicnetwork-on-chip(NoC).

简介：Timesynchronizationtechniques,especiallyonthepulsepersecond(PPS)temporalbasis,haveattractedgrowingresearchinterestsinrecentyears.Inthispaper,wehaveproposedandexperimentallydemonstratedahigh-precisiontwo-waytimetransfer(TWTT)systemtorealizelong-distancedisseminationof1PPSsignalgeneratedbyahydrogenmaser.Adense-wavelength-division-multiplexing(DWDM)systemandbi-directionalerbium-dopedfiberamplifiers(Bi-EDFAs)havealsobeenadoptedtosuppresstheimpactofRayleighbackscatteringandoptimizethesignaltonoiseratio(SNR)aswell.Wehavetheoreticallyanalyzedthesystematicdelayindetail.Theultimaterootmeansquare(RMS)variationoftimesynchronizationaccuracyissub-26psandthetimedeviationcanbereducedtoaslowas1.2psat100sand0.253psat12000s,respectively.

简介：Classicalnetworkreliabilityproblemsassumebothnetworksandcomponentshaveonlybinarystates,fullyworkingorfullyfailedstates.Butmanyactualnetworksaremulti-state,suchascommunicationnetworksandtransportationnetworks.Thenodesandarcsinthenetworksmaybeinintermediatestateswhicharenotfullyworkingeitherfullyfailed.Asimulationapproachforcomputingthetwo-terminalreliabilityofamulti-statenetworkisdescribed.Two-terminalreliabilityisdefinedastheprobabilitythatdunitsofdemandcanbesuppliedfromthesourcetosinknodesunderthetimethresholdT.Thecapacitiesofarcsmaybeinastochasticstatefollowinganydiscreteorcontinuousdistribution.Thetransmissiontimeofeacharcisalsonotafixednumberbutstochasticaccordingtoitscurrentcapacityanddemand.Tosolvethisproblem,acapacitatedstochasticcolouredPetrinetisproposedformodellingthesystembehaviour.Placesandtransitionsrespectivelystandforthenodesandarcsofanetwork.Capacitatedtransitionandself-modifiedtokencolourwithrouteinformationaredefinedtodescribethemulti-statenetwork.Bythesimulation,thetwo-terminalreliabilityandnodeimportancecanbeestimatedandtheoptimalroutewhosereliabilityishighestcanalsobegiven.Finally,twoexamplesofdifferentkindsofmultistatenetworksaregiven.

简介：:Twonovelpoly[(3-alkyhhiophene-2,5-diyl)-(benzylidenequinomethane-2,5-diyl)s]derivatives,poly[(3-butylthiophene-2,5-diyl)-(p-N,N-dimethylamino)benzylidenequinomethane-2,5-diyl)](PBTDMABQ)andpoly[-(3-octylthiophene2,5-diyl)-(p-N,N-dimethylamino)benzylidenequinomethane-2,5-diyl)](POTDMABQ),weresynthesized.Thebandgapsofthetwopolymersarecalculatedas1.75eVforPBTDMABQand1.69eVforPOTDMABQ,respectively.Thehomogenousfilmsofthetwopolymerswerepreparedandtheirthird-ordernonlinearopticalpropertieswerestudiedbythebackwarddegeneratefour-wavemixingat532nm.Byusingtherelativemeasurementtechnique,thethird-ordernonlinearopticalsusceptibilitiesofPBTDMABQandPOTDMABQarecalculatedas5.62×10^-9and1.22×10^-8ESU,respectively.Itisfoundthatsubstitutedalkygroupshavestrongeffectsonthebandgapandnonlinearopticalpropertiesofthetwopolymers.Therelativelybigthird-ordernonlinearopticalsusceptibilitiesandsmallbandgapofPOTDMABQresultedmainlyfromthelongeralkylwithstrongelectron-donatingabilitycanenhancethedelocationdegreeofconjugatedπelectronics.