简介:Inthispaper,wehaveproposedahybridopticalwavelengthdemultiplexerandpowercombinerforahybridtimeandwavelength-divisionmultiplexing(TWDM)passiveopticalnetwork(PON),i.e.,asinglepassiveopticaldevicethatfunctionsasa1×Nwavelengthdemultiplexerfordistributingthedownstreamsignalinmultiplewavelengthsfromtheopticallineterminal(OLT)totheNopticalnetworkunits(ONUs),andsimultaneouslyasanN×1powercombinerforcollectingtheupstreamsignalinthesamewavelengthfromtheNONUstotheOLT.Throughadesignexampleofa32channelhybridopticalwavelengthdemultiplexerandpowercombineronthesilicon-on-insulatorplatform,ournumericalsimulationresultshowsthattheinsertionlossandadjacentchannelcrosstalkofthedownstreamwavelengthdemultiplexerareaslowas4.6and-16.3dB,respectively,whiletheinsertionlossandchannelnon-uniformityoftheupstreampowercombinercanreach3.5and2.1dB,respectively.Theproposedstructurecanreadilybeextendedtoothermaterialplatformssuchasthesilica-basedplanarlightwavecircuit.Itsfabricationprocessisfullycompatiblewithstandardclean-roomtechnologiessuchasphotolithographyandetching,withoutanycomplicatedand/orcostlyapproachinvolved.
简介:Wepresentapolarization-maintainingPANDAring-corefiber(PM-PRCF)characterizedbythecombinationofaring-corestructurewithtwostress-applyingrods.Thisspecialfiberdesignseparatestheadjacentmodesandavoidsthecutoffofthehigher-ordermodes,whichisacommonprobleminellipticalcorepolarization-maintainingfew-modefibers.Usingahigh-contrastindexringandstress-inducedbirefringence,thePM-PRCFfeaturessupportfor10vectormodes,witheffectiverefractiveindexseparationsfromtheiradjacentmodes>10-4.Broadbandperformanceisinvestigatedsubsequentlyoverawidewavelengthrangefrom1500to1630nm.Theproposedfiberistargetedatapplicationsinspace-divisionmultiplexingwhileeliminatingthecomplexmultiple-inputmultiple-outputsignalprocessing.
简介:Two-dimensional(2D)graphitecarbonnitride(g-C3N4)nanosheetshavebeensuccessfullyusedasasaturableabsorber(SA)inapassivelyQ-switchedNd:LLFlaserat1.3μmforthefirsttime,tothebestofourknowledge.Underanincidentpumppowerof9.97W,theshortestpulsedurationof275nswasacquiredwithoutputpowerof0.96Wandpulserepetitionrateof154kHz,resultinginapulseenergyof6.2μJ.Inaddition,thesaturableabsorptionbehaviorsofzero-dimensional12nmg-C3N4nanoparticles(g-C3N4-NPs)andthree-dimensionalorderedmesoporousg-C3N4(mpg-C3N4)werealsoobserved,althoughtheirmorphologyandstructurewerequitedifferentfrom2Dg-C3N4.Theexperimentalresultsintroducethepotentialapplicationofg-C3N4nanomaterialsasSAsinQ-switchedlasers.
简介:Reductionofmodulatorenergyconsumptionto10fJ∕bitisessentialforthesustainabledevelopmentofcommunicationsystems.Lumpedmodulatorsmightbeaviablesolutionifinstructedbyacompletetheorysystem.Here,wepresentacompleteanalyticalelectro-opticresponsetheory,energyconsumptionanalysis,andeyediagramsonabsolutescalesforlumpedmodulators.Consequentlythespeedlimitationisunderstoodandalleviatedbysingle-driveconfiguration,andcomprehensiveknowledgeintotheenergydependenceonstructuralparameterssignificantlyreducesenergyconsumption.Theresultsshowthatsiliconmodulationenergyaslowas80.8and21.5fJ∕bitcanbeachievedat28Gbdunder50and10Ωimpedancedrivers,respectively.A50Gbdmodulationisalsoshowntobepossible.Theanalyticalmodelscanbeextendedtolumpedmodulatorsonothermaterialplatformsandofferapromisingsolutiontothecurrentchallengesofmodulationenergyreduction.
简介:我们在Mn50Ni40SnSbx(x=1,2,3,和4)合金。所有准备样品在房间温度与空间组一起展出B2类型结构。Sb的替换增加原子价电子集中并且减少联合起来的房间体积。作为结果,当x增加,magnetostructural转变向更高的温度很快变。在在不同磁场变化下面的磁性的熵的变化在这转变附近被探索。等温的磁化曲线展出典型metamagnetic行为,显示magnetostructural转变能被一个磁场导致。悦耳的martensitic转变和磁性的熵变化建议那Mn50Ni40SnSbx合金是应用在的吸引人的候选人固态制冷。