光眼图测量技巧.pdf

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1、presentedby:ShinYanoAugust2005SolvingaMysteryinOpticalEyeDiagramMeasurementIntroductionInconsistentinExtinctionRatioSmallerMaskMarginResultCanIuseacheaperdevice?TitleofPresentationAgilentRestrictedPage2Date1AgendaExtinctionRatioMeasurementMaskMarginTestEffectofClockDataRecoverytoEyetest

2、ingSummaryTitleofPresentationAgilentRestrictedPage3DateIssueinExtinctionRatioMeasurement“Isawtwodifferentresults.Whichiscorrect?““Iusedtwolooks-samemodulestotest.”6.84dB(86105B#101)6.23dB(86105B#102)TitleofPresentationAgilentRestrictedPage4Date2ExtinctionRatio–DefinitionERlinear=E1/E0ER

3、(dB)=10log10(ERlinear)ER(%)=100XE0/E1Tofindtheenergyinabityoumustintegratetheinstantaneouspoweracrossthebitperiod.ER=theratioof:theenergyusedtotransmitalogiclevel‘1’totheenergyusedtotransmitalogiclevel‘0’TitleofPresentationAgilentRestrictedPage5DateFactorsaffectingtheERmeasurementShapeo

4、fInputwaveformFilteredorUnfilteredFrequencyResponseofthefilterSignalLevelandNoise(S/N)Calibration(Modulecal&Darkcal)StandardofERisnotavailable…..TitleofPresentationAgilentRestrictedPage6Date3UsingtheFilterHowtodefine“1”level?WiththeFilterTypicalwaveformofLasertransmitterTitleofPresentat

5、ionAgilentRestrictedPage7DateFrequencyResponseoftheFilterV0.75xDataRate@-3dB(4thorderBessel-Thompson)VBothFiltersarecompliantVActualisnotIdealTitleofPresentationAgilentRestrictedPage8Date4AffectofFrequencyResponseDCGainERA>ERBABACGainERA

6、ffectofNoiseLevelNoiseaffectssignificantlyfromacertainnoiselevelUncorrectedERversusInputLevel86105C,9.9528Gb/s,filterON,KatmanduER<0.25%65.554.5MeasuredER,%4-25-20-15-10-5InputLevel,dBmTitleofPresentationAgilentRestrictedPage10Date5OffsetsgeneratedbytheinstrumentationµdarkµσTurnOffTitle

7、ofPresentationAgilentRestrictedPage11DateOffsetsarecompensatedthroughtheExtinctionRatioCalibrationOne-level–Dark-levelRatioER=Zero-level–Dark-levelOne-level–Dark-leveldBERdB=10log10[Zero-level–Dark-level]Zero-level–Dark-level%ERpercent=100[One-level–Dark-level]TitleofPresentati