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

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：这篇文章在切换的概括多协议标签(GMPLS)中讨论资源冲突的问题控制光网络。基于当前的随机的重建机制和它的缺点的分析，也就是，这篇文章为改进介绍二个提高的解决方案基于优先级的资源分配机制和网络管理系统(NMS)基于顺序的资源分配机制。试验性的结果证明介绍机制比以连接安装/恢复时间和成功的率重建答案的原来的随机更好表现。

简介：这篇文章介绍一台对称的self-electrooptic效果设备(S种子)的基本结构，并且使用Kirchoff的当前的法律和一个完全相等的电容的模型，到分析S-SEED的开关特征。线性近似和N片断近似被利用获得S-SEED的电压时间(vt)和特征。理论分析被模拟验证，并且结果证明S-SEED的开关时间的精确能与线性近似在应用满足要求。而且，模拟把S-SEED的开关特征与不同输入力量和输入对比比率作比较，它表明那增加的输入对比比率是改进S-SEED的开关特征的一个有效方法。

简介：Inthispaper,opticalcross-connection(OXC)inducedcrosstalkhasbeencarefullyanalyzedformultiwavelengthall-opticalnetworks.Formulaearederivedforcalculatingthecrosstalkpowerofhomowavelengthcrosstalkandthetotalcrosstalkatthereceiverend.TheresultsshowthattheopticalswitchesinducedcrosstalkdominatesoverothercrosstalkcomponentsofOXC,andtheaccumulatedhomowavelengthcrosstalkincreasesalmostlinearlywiththeincreasingoftheOXCnumber.Atthereceiverend,theheterowavelengthcrosstalkinducedbythereceiveropticalfilterhasthesameorderasthatofhomowavelengthcrosstalkofOXC.Theresultsofdifferentopticalcomponentsmodelarealsodiscussed.

简介：Inisnecessarytostudydynamicoperationefficiencyoftransmissionnetworksinordertorealizehighintensificationofcommunicationnetworks.Theoperationefficiencydiscussedhereshouldexistnotinlogic-circuitlayer,butalsoinbothpathlayerandmediumlayer.Atheoreticalmethodofthemeasurementoflayersanscomprehensiveevaluationsispresentedbasedontheconceptoftransmissionefficiency.

简介：服务(QoS)的A~*梅脯质量路由算法被建议计算K短路径令人满意的多重QoS限制。因为它的灵活性，A~*梅脯在处理许多实际限制被认为是为聪明的光网络的实际路由算法之一。这篇文章通过广泛的模拟实验给算法的详细表演研究。我们发现那运行时间和算法的存储器空间要求大，特别当网络尺寸增加时。Inthis文章，我们也建议一条途径到改进A~*梅脯算法的表演。改进应该在聪明的光网络为实际使用使A~*梅脯算法更吸引人。

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简介：蚂蚁殖民地优化(ACO)基于平衡路由的负担，波长赋值(RWA)算法(ALRWA)为完成在全部光卫星网络上平衡的仙女般的负担的缘故被提出。一个多客观的优化模型就全球交通分发的特征而言被建立。这不仅采用交通紧张修改轻路径费用，而且监视光内部卫星的连接(ISL)的波长利用。然后，一个ACO算法被利用解决这个模型，导致发现为每个连接请求的一条最佳的轻路径。最佳的轻路径让最小的轻路径花费了在下面令人满意波长利用，传播延期和波长连续性的限制。模拟结果证明ALRWA在堵住概率表现很好并且认识到有效负担平衡。同时，平均传播延期能满足即时企业传播的基本要求。

简介：Networkcodingbringsmanybenefitsformulticastnetworks.Itisnecessarytointroducenetworkcodingintoopticalnetworks.Nevertheless,thetraditionalnetworkcodingschemeishardtobeimplementedinopticalnetworksbecauseoftheweakoperationcapabilityinphotonicdomain.Inthepaper,wefocusedonrealizingtwo-channelnetworkcodinginall-opticalmulticastnetworks.AnopticalnetworkcodingschemewhichcanberealizedvialogicshiftandlogicXORoperationsinphotonicdomainwasproposed.Moreover,toperformthenetworkcodingschemethecodingnodestructurewasdesignedandtheoperationprincipleandprocesseswereillustratedindetail.Intheendofthepaper,theperformanceandthecostofdifferentall-opticalmulticastmodewerecomparedandanalyzed.

简介：带宽变量光网络不能仅仅提供带宽灵活的lightpaths，而且完成高能力所有光的切换，并且改进光谱效率。然而，为在直角的频率部门的光谱任务，multiplexing(OFDM)基于带宽变量光网络，很多副载波资源将与分布式的发信号在保留的过程期间被重叠，是否因为第一适合(FF)算法或为随机合适(RF)算法。以便解决资源保留碰撞的问题，我们建议二个路径计算元素(PCE)基于光谱任务算法和二个相应优化算法。但是甚至为基于PCE的光谱赋值，副载波资源的很多碎片将在资源保留的进程期间被产生，并且满足LSP建立并且拆卸，它将败坏全部网络的性能严重。这份报纸在基于OFDM的带宽变量为副载波光谱资源建议一个基于PCE的碎片整理算法光网络，哪个证明这个算法能更加减少副载波碎片并且改进光谱的连续性的模拟结果资源。

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