简介：Usingelectromagneicfieldtheoryofdielectricinacylindricalcoordinatessystem,thetheoreticalanalysisandcalculationforarotatoryopticfiberarepresentedinthispaper.

简介：Anewbipolarjunctionfield-effecttransistor(BJFET)wasdescribed.ThetheoreticalanalysisandcomputersimulationofBJFETobstructivecharacteristicareachieved.ThegatebiasvoltageaffectstheBJFETobstructivevoltagegreatly.TheBJFETobstructivecharacteristicisrelevanttostructureparametersofchannelwidthWandchannellengthL.Thedecrease-bias-voltageoperationcanweakenthedeviceobstructivecharacteristic.TheforwardturnindeviceforwardobstructiveregioncanalsoaffecttheBJFETobstructivecharacteristic.BJFEThasagoodhightemperatureobstructivecharacteristicandcanbeapplyingtohightemperaturestatusashighvoltageswitchdevices.

简介：Inthispaperthepressure-magneto-electriceffectofJunctionFieldEffectTransistor（JFET）isdiscussedbyusingstandardrelaxationtechniques.AtheoreticalevaluationofthepressuresensitivityandHallsensitivityofthen-channelsiliconJFETwithvariousgeometries（W/L）,gatevoltages(VFS)anddrainvoltages(VDS)ismade.TheresultsshowthatwhenP≠0,B=0,thecurrent-pressuresensitivityisabout2.5%.cm2/N,supposingW/L（?）1/2-1.Basedonthat,ajunctionfieldeffectpressuresensorwithhighstabilityandlownoiseisdesigned.

简介：Theoutputcharacteristicsofphase-shiftedlong-periodfibergratings(LPGs)areanalyzedusingtransfermatrixmethod.Thetransmissionsandtheirenvelopsofseveralkindsofthesegratingsaregiven.Thecharacteristicsofphase-shiftedLPGsandBragggratingsarecompared.Thepossibleapplicationsofphase-shiftedLPGsarediscussed..

简介：Withthevigorousexpansionofnonlinearadaptivefilteringwithreal-valuedkernelfunctions,itscounterpartcomplexkerneladaptivefilteringalgorithmswerealsosequentiallyproposedtosolvethecomplex-valuednonlinearproblemsarisinginalmostallreal-worldapplications.ThispaperfirstlypresentstwoschemesofthecomplexGaussiankernel-basedadaptivefilteringalgorithmstoillustratetheirrespectivecharacteristics.ThenthetheoreticalconvergencebehaviorofthecomplexGaussiankernelleastmeansquare(LMS)algorithmisstudiedbyusingthefixeddictionarystrategy.ThesimulationresultsdemonstratethatthetheoreticalcurvespredictedbythederivedanalyticalmodelsconsistentlycoincidewiththeMonteCarlosimulationresultsinbothtransientandsteady-statestagesfortwointroducedcomplexGaussiankernelLMSalgonthmsusingnon-circularcomplexdata.Theanalyticalmodelsareabletoberegardasatheoreticaltoolevaluatingabilityandallowtocomparewithmeansquareerror(MSE)performanceamongofcomplexkernelLMS(KLMS)methodsaccordingtothespecifiedkernelbandwidthandthelengthofdictionary.

简介：Inthisletter,atheoreticalmodelofradiation-balanceddoublecladfiberlaserispresented.ThecharacteristicofthelaserwithYbdopeddoublecladfiberisanalyzednumerically.Itisconcludedthathighoutputlaserpowercanbeobtainedbyselectingoutputcouplingmirrorwithlowerreflectivity,improvingYbdopedconcentrationandchoosingfiberlength.Thisresultcanhelpustodesignradiationbalancedfiberlaser.

简介：基于飞机波浪方法，有在x-y飞机的45°的全部格子旋转的木柴堆结构photonic水晶的完全的禁止的乐队的光性质理论上以height-to-pitch比率，充满的因素，和旋转角度被学习。计算结果证明到中间差距的比率的差距随着充满的部分从0.25～0.30稍微变化。最佳height-to-pitch比率是大约1.3。当旋转角度与1.3的经常的height-to-pitch比率从42°从40°增加到50°和最大的差距到为旋转角度未改变的0.2个遗体的中间差距的比率到48°时，到中间差距的比率的差距到达超过0.18。当height-to-pitch比率是1.3时，到中间差距的比率的差距到达0.2的最大的价值。这木柴堆类型photonic晶体能在一个更宽的参数范围以内提供大乐队差距，它使在实验室生产三维的photonic晶体方便。

简介：Thetheoreticalexpressionoftherelationshipbetweenoptimumdopingcontentandcrystalstructureispresentedaswellasthepreparationmethods.Byusingthisexpression,theoptimumdopingcontentofsilicon-dopedboroncarbidethinfilmiscalculated.Thequantitativecalculationvalueisconsistentwiththeexperimentalresults.Thistheoreticalexpressionisalsoappropriatetoresolvetheoptimumdopingcontentforotherelectricmaterials.

简介：TimedomainABCDmatrixformalismisausefulmodelforanalyzingthecharacteristicsofactivelymodelockedfiberlaser.Basedonthismodelandgivenmoreconsiderationontheinfluencesofopticalfiberdispersionandopticalfibernonlinearity,thelasercharacteristicofactivelymodelockedfiberlaserisanalyzed,andthecomparisionofthetheoreticalanalysisresultswithexperimentalonesisgiven.

简介：Q－doubleeffectofdifferentbalancebridgevoltagecontrolledcrystaloscillator(DBVCXO)isquantitativelyanalysedbythecomputersimulation.

简介：Theadaptiveoptics(AO)technologywithoutawave-frontsensorissimpleandhasmoreapplicationfieldsthanconventionalAOtechnologies.ThetheorybasisoftheAOsystembasedonstochasticparallelgradientdescent(SPGD)fromtheconvergence,thestability,andtheaveragedconvergencerateisanalyzed,whereSPGDisusedtocontroltheAOsystem.TheresultsshowthattheAOsystembasedonSPGDcanobtaingoodconvergenceandstability,andthefastconvergencerate,whichisininverseproportionton(nisthenumberofcontrolparameters).

简介：Atheoreticalmodelinthe1900nmwavebandforamplifiedspontaneousemission(ASE)ofthulium-dopedsilicafiberispresented.TheASEspectralpowerasfunctionsofthefiberlengthandthepumppowerisinvestigatedbysolvingtherateandpropagationequations.Bycalculation,whentheconcentrationofthuliuminfiberis2.25×1025m-3,thefibercorediameteris2.6μm,andthepumppoweris200mWat808nm,theoptimalfiberlengthis8.1m,andtheoutputpowerofASEcanreach60mWintherangeof1800-1950nmwiththisfiberlength.Theoptical-to-opticalconversionis30.3%.Theoptimalpumppoweralsocanbeobtainedbythismodel.

简介：Fiber-opticMach-Zehnderinterferometer(MZI)canbeusedaswavelength-multiplexersanddemultiplexers.The△Land△φdirectlyinfluencethepropertiesofMZI.Tolengthenthe△Lcandemultiplexmuchmorewavelengths,butwhenthe△Lislonger,thetemperaturewillinfluenceMZImoreseriously.Amethodtosolvethisproblemisproposed,whichenablesMZItoworkstably.Thewavelengthdistanceis0.8nm,andtheextinctionratioishigh.