学科分类
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3 个结果
  • 简介:Themicrowavephotonicfilters(MPFs)basedonseriallycoupledsiliconmicroringresonators(MRRs)aretheoreticallyanalyzedfortheapplicationof60-GHzmillimeterwavewirelesspersonalareanetworks.Thisisachievedbycalculatingtheimprovementofbiterrorratio(BER).Accordingtothesimulationresults,therequirementofsignal-to-noiseratio(SNR)ofthereceiveddatacanbereducedby14dBforthesameBERwithandwithoutMPFs.TheperformanceoftheMPFwithfiveseriallycoupledmicroringstructuresisbetterthanthatoftheMPFwithasinglemicroring,owingtotheimprovementoftheshapefactor.

  • 标签: 微波光子 谐振器 滤波器 GHZ 微环 串行
  • 简介:Aweakinfrared(IR)imageamplifierwithmorethan60-dBopticalgainandfrequencyup-conversionisdevelopedfromapicosecond(PS)355-nmpumpedgatedopticalparametricamplifier(OPA)inaβ-BaB2O4(BBO)crystal.TheIRimageat1064nmisamplifiedandup-convertedintothevisibleregionat532nmbyparametricamplificationandup-conversion.Withtheoptimizedopticalgain,thelowestdetectableenergyoftheimagecanbeaslowas1.8femto-Jouleperpulse,whichisthreeordersofmagnitudelowerthanthedetectionlimitofacharge-coupleddevice(CCD)camera.ThetransversalresolutionoftheOPAimagingisinvestigated,andtheapproachesforhigherdetectionsensitivityandhighertransversalresolutionareproposed.

  • 标签: 频率上转换 放大器 光增益 光学参量 成像 皮秒
  • 简介:Real-timevideostreamingusingultra-wideband(UWB)technologyisexperimentallydemonstratedalonglong-reachpassiveopticalnetworks(LR-PONs)withdifferentwiredandwirelessreaches.ExperimentaltestsusingexternalanddirectmodulationwithUWBwirelessradiationinthe10-and60-GHzbandsareperformed.Anultra-bendablefiberisalsoconsideredforalast-miledistribution.ThevideoqualityattheoutputoftheopticalfiberinfrastructureoftheLR-PONisassessedusingtheerrorvectormagnitude(EVM),andthelinkqualityindicator(LQI)isusedasafigureofmeritafterwirelessradiation.AnEVMbelow–17dBisachievedforbothexternallyanddirectlymodulatedLR-PONscomprisingupto125kmofopticalfiber.EVMimprovementisobservedforlongerLR-PONswhendirectlymodulatedlasers(DMLs)areusedbecauseoftheamplitudegainprovidedbythecombinedeffectofdispersionandDML’schirp.Comparedwithopticalback-to-backoperation,theLQIleveldegradestothemaximumaround20%forLR-PONsrangingbetween75and125kmoffiberreachandwithawirelesscoverageof2minthe10-GHzUWBband.ThesamelevelofLQIdegradationisobservedusingthe60-GHzUWBbandwithaLR-PONintegrating101kmofaccessnetwork,alast-miledistributionusingultra-bendablefiber,anda5.2-mwirelesslink.

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