Photonic analog-to-digital converters A tutorial

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1、OMI1.pdf©2009OSA/OFC/NFOEC2009PhotonicAnalog-to-DigitalConvertersATutorialGeorgeC.ValleyElectronicsandPhotonicsLaboratoryTheAerospaceCorporationgeorgevalley@aeroorggeorge.valley@aero.org310-336-0336978-1-55752-865-0/09/$25.00©2009IEEEAcknowledgementsCoworkersTheAerospppaceCorp:Jason

2、Chou,JoshConwaygy,GeorgeSefler,BobWaldenUniversityofCalifornia:LosAngeles:ShalabhGupta,BahramJalaliPhotonicSystemsInc.:GaryBettsThisworkwassupportedunderTheAerospaceCorporation'sIndependentResearchandDevelopmentProgramandundersubcontracttotheUniversityofCalifornia,LosAngelesaspartof

3、DARPAContractNo.N66001-07-1-2007george.valley@aero.orgOutline•WhatisaphotonicADC?•ElectronicADCbasics—samplingandquantization•SfStateoftheart:–ADCs–Interleaveddigitizers–Digitaloscilloscopes•ClassesofphotonicADCs:Photonic-–Assisted–Sampled–Quantized–Delta-sigmamodulator•Microwavepho

4、toniclinksinphotonicADCs•ExamplesofphotonicADCs•Recentresultstime-stretchADCs–10Terasample/secondtransientdigitizer–7-ENOB10GHz2-channelADC–150Gigasample/secondcontinuoustimedigitizer•Summarygeorge.valley@aero.orgWhatisaphotonicanalog-to-digitalconverter?•Opticalsignal–Inputanalogop

5、ticalsignalInputanalogopticalsignal–OutputdigitalopticalsignalRelativelylittleworkhereMostanalogopticalsignalsareincoherentlightMostanalogopticalsignalsareincoherentlight•RFsignal–InputanalogelectronicsignalInputanalogelectronicsignal–Dosomethingtoelectronicsignalusingphotonics–Outp

6、utdigitalelectronicsignalMostphotonicADCworkishereMostphotonicADCworkisheregeorge.valley@aero.orgSamplingrateandnumberofbits•Familiarquantities–SamplingrateSamplingrate—egCD441kHzorkilosample/sec(kS/s)e.g.CD44.1kHzorkilosample/sec(kS/s)–Numberofread-outbits(statedbits)—CD16bits•More

7、usefulcharacterizationsofADCperformance–InputbandwidthInputbandwidth—egCD20Hzto20kHze.g.CD20Hzto20kHz•Nyquistsamplingtheoremsayssamplingratemustbe>2xbandwidth•ADCnoisebandwidthADCnoisebandwidth=inputbandwidthinputbandwidth–Effectivenumberofbits(ENOB)•DependsonSignal-to-Noise-and-Dis

8、tortionRatio(SNDR)•