半导体光电子学

2019/8/41半导体光电子学的新进展RecentProgressonSemiconductorBasedOpto-electronicDevices罗毅YiLUO集成光电子国家重点实验室清华大学电子工程系StateKeyLabonIntegratedOptoelectronicsDept.ofElectronicEngineering,TsinghuaUniversity2019/8/4StateKeyLabonIntegratedOptoelectronics2BackgroundTheDemandforMoreBandwidthInternet,multimediacommunications,andetcMethodstoIncreaseSystemCapacityWDM(Wavelength-DivisionMultiplexing)OTDM(OpticalTime-DivisionMultiplexing)BenefitsofWDMtechniquesFlexibilityandscalabilityforavarietyofnetworkarchitecturesWDMtechniquesarethebackboneofmodernopticalfibernetworks2019/8/4StateKeyLabonIntegratedOptoelectronics3适用带宽50THz8001000120014001600传输损耗（dB/Km）0.01.02.013001550波长（nm）单模石英光纤传输损耗曲线2019/8/4StateKeyLabonIntegratedOptoelectronics4OXC光放大OADM(AWG、光开关阵)OADMWDM光纤网络示意图波分复用可调谐、高速集成光源波长转换器、光开关等2019/8/4StateKeyLabonIntegratedOptoelectronics5KeyDevicesforWDMOpticalFiberNetworkSystemsLightSources•Low-costuncooledLDs•DirectlymodulatedLDs•ModulatorintegratedDFBLDs•Wavelengthtunable/selectableLDsHigh-SpeedPhotodetectorsSOAandWavelengthConverterAWGandRelated2019/8/4StateKeyLabonIntegratedOptoelectronics62019/8/4StateKeyLabonIntegratedOptoelectronics7Low-CostUncooledLDsApplications•Accessnetwork•Metropolitantransmission•Bitrate:155MB/s(FP-LDs)~10Gb/s(DFB-LDs)Requirements•Widetemperaturerangeoperation•Cost-effectivestructurefordevicefabrication•Highefficiencyandlargetoleranceforcouplingoutputlightintoasinglemodefiber2019/8/4StateKeyLabonIntegratedOptoelectronics8UncooledGain-CoupledDFBLDsStablesinglemodeoperationfrom-40to85CIntegratedbeam-expanderforimprovedcouplingtoleranceGain-coupledDFBlaserswithcurrent-blockinggratings2019/8/4StateKeyLabonIntegratedOptoelectronics9DirectlyModulatedDFBLDsApplications•GigabitEthernet•Metropolitantransmission•Bitrate:upto10Gb/s•Wavelength:1.3m&1.55mLimitations•Limitedtransmissionspan(20km)duetolargelinewidthenhancementfactor(4)•Modulationspeedislimitedbycarrierrelaxationoscillation2019/8/4StateKeyLabonIntegratedOptoelectronics1010Gb/sDirectlyModulatedDFBLDsforMetropolitanDataTransmissionSmall-signalRFResponseBERCharacteristics2019/8/4StateKeyLabonIntegratedOptoelectronics11EAModulatorIntegratedDFBLDsApplications•Trunklinetransmission•Bitrate:2.5Gb/s~40Gb/sAdvantages•Compactsize•Lowcouplingloss•Lowfrequencychirping•Reducedcost•Improvedreliability2019/8/4StateKeyLabonIntegratedOptoelectronics1210Gb/sEAModulatorIntegratedDFBLDsforTrunkLineCommunicationsTransmissionlength:100kmFeature:Lowpowerpenalty(1.5dB)&Widebandwidth(~14GHz)2019/8/4StateKeyLabonIntegratedOptoelectronics1310Gb/sEAModulatorIntegratedDFBLDsEyeDiagramBERPerformance2019/8/4StateKeyLabonIntegratedOptoelectronics14WavelengthTunable/SelectableLDsAdvantages•Abilitytorestorefailedchannels•Reducedtransmittercost•IncreasedflexibilityforfuturenetworkmanagingWavelengthTunablevs.WavelengthSelectable•WavelengthTunableLDs:BasedonDBRstructuresCompactdevicestructurePoorreliability&Electriccrosstalkathighfrequency•WavelengthSelectableLDs:BasedonDFBLDarraysRelativelycomplicateddevicestructureImprovedreliabilityandwavelengthstability2019/8/4StateKeyLabonIntegratedOptoelectronics15Multi-rangeWavelengthSelectableLDsForuseinback-up&add-dropinDWDMphotonicnetworkDFB-LDsintegratedwithMMIcoupler,SOA,andEAmodulatorCompactsize(400m2840m)2019/8/4StateKeyLabonIntegratedOptoelectronics16Multi-RangeWavelengthSelectableLDArraysforDWDMSystems15nm/chipwavelengthselectablerangeWavelength&ThresholdcurrentLasingSpectra2019/8/4StateKeyLabonIntegratedOptoelectronics17High-SpeedPhotodetectorsConventionalConfigurations•Surfaceilluminatedp-i-nphotodetector•Avalanchephotodetector(APD)Limitations•LimitedbandwidthforAPDdetectors•Trade-offbetweenbandwidthandefficiencyforsurfaceilluminatedp-i-ndetectorsCurrentTrend•SideilluminatedstructureWaveguidep-i-nphotodiodes2019/8/4StateKeyLabonIntegratedOptoelectronics18WidebandWaveguidePhotodiodefor40Gb/sSystemsMonolithicreceivercomposedofmultimodewaveguidep-i-nphotodiodeandaHEMTdistributedamplifier2019/8/4StateKeyLabonIntegratedOptoelectronics19MonolithicReceiverOEICModulefor40Gb/sSystemsBERofReceiverOEICEyeDiagram@50Gb/s