简介：TheanalysisofcelllossratesinanATMMuxwithlossprioritiesisanimportantprobleminthe-studyoftrafficcontrolinATMnetworks.Inthispaper,thelossratesofthecellswithdifferentprioritiesinanATMMuxareanalyzedbyapproximatingtheactualinputprocesswithtwo-stateMMDPandfluidflowtechnique,andtheanalyticalexpressionsoftherelationbetweenthelossratesandthebuffersizeareobtained.Simulationshowsthattheapproachissullicientlyaccurateforapplications.

简介：Asimplesetupforthemeasurementoftransmissionlossinpolymerthinfilmopticalwaveguidesisdescribed.Anewelectro-opticpolymerfilmhasbeenprepared.Thetransmissionlossofthefilmismeasuredbeforeandaftercoronapoling.Andthelossisdeterminedtobe1.84dB/cmand2.14dB/cm,respectively.

简介：Themechanismofγ-rayradiationinducedabsorptionlossoftheopticalfiberinvisiblerangeisanalyzed.Accordingtothemechanism,thequantitativerelationbetweenlossinopticalfiberandγ-raycumulationdoseisfoundbyuseofmethodsofsolidphysicsandstatisticphysics.Thisquantitatierelationiscertifiedintermsoftheresultsofradiationexperiment.

简介：就共鸣器而言的戒指microresonator过滤器内部损失理论上被分析，它有一个输入端口和二个输出端口。为在microresonator和绝缘的波导之间的光力量联合的一些通用关系被介绍。在半最大值(FWHM)的过滤器带宽或完整的宽度的分析表情，免费光谱共鸣器的范围和灵巧被导出。戒指microresonator过滤器的特征数字地被讨论。戒指共鸣器的损失减少传播的山峰价值，这被表明，拓宽过滤器带宽，并且减少共鸣器过滤器的灵巧。

简介：有逐渐地沿着光线的轴增加空气洞的直径的三角形格子的高度双折射的photonic水晶纤维(PCF)被提出。形式的birefringence，分散和基本模式的监禁损失被完整的向量Galerkin有限元素方法模仿(女性)与完美地匹配的层(PML)。当空气洞的戒指是很少时，结果证明这PCF能把低监禁作为损失。当波长是1.55渭m时，birefringence，监禁损失快轴、慢轴是1.365脳10?3，0.017dB/m和0.051dB/m分别地。一个新方法被建议与高效制作polarization-mainting纤维。

简介：Weproposeafullydistributedfusionsystemcombiningphase-sensitiveopticaltime-domainreflectometry(Φ-OTDR)andOTDRforsynchronousvibrationandlossmeasurementbysettinganingeniousfrequencysweeprate(FSR)oftheopticalsource.TherelationshipsbetweenFSR,probepulsewidthandrepeatperiodaregiventobalancetheamplitudefluctuationofOTDRtraces,thedeadzoneprobabilityandthemeasurablefrequencyrangeofvibrationevents.Intheexperiment,weachievesynchronousvibrationandlossmeasurementwithFSRof40MHz/s,theproblepulsewidthof100nsandrepeatrateof0.4ms.ThefluctuationofOTDRtraceislessthan0.45dBwhenthesignalto-noiseratio(SNR)isover12dBforacapturedvibrationeventlocatedat9.1km.Theproposedmethodcanbeusedfornotonlydetectionbutalsoearlywarningofdamageeventsinopticalcommunicationnetworks.

简介：Toreducethecomputationburdenofalarge-aperturemultiple-inputmultiple-output(MIMO)sonarimagingsystem,thephase-shiftbeamformer(PSBF)isusedatthecostofbringingtheintensityloss(IL).ThecauseoftheILisanalyzedindetailandavariabletermedasILfactorisdefinedtoquantifythelossamount.TocompensatefortheIL,twomethodstermedasintensitycompensationforthePSBF(IC-PSBF)andthehybridbeamforming(HBF),respectively,areproposed.TheIC-PSBFusespreviouslyestimatedILfactorstocompensateforoutputintensitiesofallPSBFs;andtheHBFappliestheIC-PSBFtothecenterbeamregionandtheshifted-sidebandbeamformer(SSBF)tothesidebeamregion,respectively.Numericalsimulationsdemonstratetheeffectivenessofthetwoproposedmethods.

简介：TheISMbandat2.4GHzhasmostlybeenusedorplannedforindoorsystems.Thisbandisalsoattractiveforoutdoorsystemsowingtotheeaseofthesystemdeployment,asnofrequencylicensesarerequired.Inthispaper,amultiplesuccessiveinternalmultireflectionmodelisusedtoestimatethecomplexelectricpermittivityat2.4GHzband.Toobtainthedata,measurementsareperformedat160MHzbandwidthcenteredabout2.4GHzusingavectornetworkanalyzer,whichprovidesinformationabouttheamplitudeandphaseoftransmissioncoefficient.Severalsamplesofeachmaterialaremeasuredandtheresultsvaryfromsampletosample.Ithasalsobeenfoundthatsomeobstacleshavepolarizationbehaviour.

简介：ExistingEthernetPassiveOpticalNetwork(EPON)DynamicBandwidthAllocation(DBA)algorithmssufferfromthedisadvantageofidletimeloss,whichlowertheupstreambandwidthutili-zation.Thisletterproposesanimprovedupstreamtransmissionschemewithidle-timeeliminatingmechanism.Theoreticalanalysisandnumericalcalculationprovethattheimprovedschemecanef-fectivelyeliminatetheidletimeandenhancetheefficiencyofupstreamlinkutilization.Simulationresultshaveshownthatthebandwidthutilizationcanberaisedupto15%inheavy-loadscenarioswhilethetimedelayperformanceofAssuredForwarding(AF)andBestEffort(BE)servicesareimprovedsimultaneously.

简介：Theconfinementlossandbendlosspropertiesofall-solidphotonicbandgapfiberswithanarrayofringsdopedwithhighindexmaterialareinvestigated.Thecalculatedresultsshowthatforaspecificstructure,theconfinementlossandthecriticalbendradiusarereducedsimultaneouslyinsomebandgapsbyincreasingtheinnerdiameterofring,whichprovidesausefulguideandatheoreticalbasisfordesigninglargemodeareafiberswithlowloss.

简介：Thehighpowerholeyfiberisanefficientsupercontinuumlightsourcebyusingpicosecondpulse,whichisalessexpensivelasersourcecomparedwithlowpowerandexpensivefemtosecondlasersources.Inthispaper,ahighpowerhighlynonlinearholeyfiber(HN-HF)withalowconfinementlossisproposedforsupercontinuumlightsources.ThefinitedifferencemethodisusedtocalculatethedifferentpropertiesoftheproposedHN-HF.Highnonlinearcoefficientsareobtainedat1.06μm,1.31μm,and1.55μmwavelengthswithflattenedchromaticdispersionandlowconfinementlossessimultaneously.Moreover,numericalsimulationresultsshowthathighpowerbroadsupercontinuumspectrawithveryshortlengthoftheproposedphotoniccrystalfiberareachieved.

简介：Alow-lossfiberopticrotaryjoint(FORJ)hasbeendesignedbyusingtwokindsofC-lenscollimators.Itsinsertionlossandinsertionlossvariationduetorotationwithsingle-modefibercollimatorislessthan1.76dBand0.43dBrespectively.Themaximuminsertionlossandcouplingvariationduetorotationwithmulti-modefibercollimatoris1.71dBand0.29dB,respectively.ThiskindofFORJfeatureslowinsertionloss,smallcouplingvariationduetorotationandlowcost.

简介：以便在量井思考类型波导解决过多的插入损失和低开／关比率光开关，新奇InGaAs/InAlAs联合了量很好结构被建议。在低应用电场(F=19kV/cm)和低吸收损失的情况中(伪鈮?1.2厘米?1)，一个大否定导致地的折射索引变化(螖n=?0.0134)在操作波长在新奇的联合的量井结构被获得(位=1550nm)。值在上述一样的工作条件上在一口矩形的量井(RQW)由与那相比的超过一～二个数量级是更大的。CLC数字TN365不到资助号码60277034和60436020由中国的国家自然科学基金会支持了

简介：一篇小说的设计优化综合基于为fiber-to-the-home应用的平面lightwave电路(PLC)更三重被描述。二模式的干扰coupler和Mach-Zehnder干扰被用来构造过滤器薄片。高隔离和低插入损失的模拟结果为建议设计被得到。技术忍耐为制作设备被改进。CLC数字TN256

简介：WereportthedepositionofNb2O5filmsonunheatedBK-7glasssubstratesusingremoteplasmasputteringsystem.Theremoteplasmageometryallowspseudoseparationofplasmaandtargetbiasparameters,whichofferscompletedepositionratecontrol.Usingappropriateoxygenflowrates,high-densityandlow-lossNb2O5filmsaredepositedwithratesupto0.49nm/s.Lowerdepositionrates(~0.026nm/s)canalsobeobtainedbyworkingatlowtargetcurrentandvoltageandatlowpressure.Nb2O5filmsdepositedatdifferentrateshavetherefractiveindexofabout2.3andtheextinctioncoefficientaslowas6.9×10-5.

简介：Thestructureoftheopticalwaveguideof2-bitelectroopticA/Dconverterwithproton-exchangemicroprismsisoptimizedbythefinite-differencebeampropagationmethod(FD-BPM).Theelectrodeparametersoftheconverterareoptimizedbyconformalmapping.Theoptimalparametersareahalf-wavevoltageofVπ=4.5VandabandwidthofΔf=1.4GHz.Anormalizedtransmittedpowerof69.75%isobtainedbyFD-BMPandtheoutputwaveguidegapis300μm.

简介：从产量和戒指共鸣器的落下港口基于传播系列的对比比率的测量，一个有效方法被建议提取联合比率和综合光波导戒指共鸣器的双程的损失。离子交换技术在K9光玻璃底层准备的一个跑道共鸣器的参数被检验，它表明这个方法的有效性。精确性和这个方法的适用的范围也被讨论。

简介：Gradient-indexrodlens(GRIN-lens)whosepitchisordinaryvaluewithbevelferrulecouplingsystemisanalyzed,anequivalentmethodwhichcanbeusedtoanalyzethissystemisputforward,andageneralformulafordeterminingthecouplinglosswithaxesmismatch,radialmismatch,andangularmismatchisderivedbyuseoftheGaussianfieldapproximationandmode-fieldcouplingtheory.Theexperimentalresultsareingoodagreementwiththetheoryprediction.Itindicatesthattheseformulasaresuitabletoanalyzethegradient-indexrodlenscouplingsystemwithpigtailfiber.

简介：新奇biopolymer，脱氧核糖核酸acid-hexadecyltrimethylammonium氯化物(DNA-HCTAC)，当在光波导的核心层材料，和cleanroom技术成功地被使用与低繁殖损失制作单个模式的隧道波导，被使用。准备DNA-HCTAC材料在光电信波长显示出高光的质量，例如高透明性，相对高的折射索引和低birefringence。在制造途径，polymethylmethacrylate(PMMA)被用作障碍层保护DNA-HCTAC材料免受光致抗蚀剂开发者的腐蚀剂的伤害，并且蚀刻的条件被优化形成光滑的墙和波导的锋利的剖面图。最后，DNA-HCTAC隧道波导的光特征被测量。结果证明DNA-HCTAC波导与单个模式的繁殖操作并且有低光损失。