a new approach to remote fiber testing in optical networks

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Transcript of a new approach to remote fiber testing in optical networks

  • A NEW APPROACH TOA NEW APPROACH TO REMOTE REMOTE FIBER TESTINGFIBER TESTING IN OPTICAL IN OPTICAL

    NETWORKSNETWORKSKreKreoo makmak

    University of Zagreb, Faculty of Electrical Engineering and CompUniversity of Zagreb, Faculty of Electrical Engineering and Computing uting

  • IntroductionIntroduction New New approachapproach to RFTS to RFTS

    SystemSystem architecturearchitecture ErrorError correctioncorrection methodmethod

    MeasurementMeasurement resultsresults SummarySummary

    OutlineOutline

  • IntroductionIntroduction

    OpticalOptical communicationcommunication systemssystems (OCS) (OCS) formform thethebasisbasis ofof allall telecommunicationtelecommunication networksnetworks

    TheThe developmentdevelopment ofof OCS OCS waswas followedfollowed byby thethedevelopmentdevelopment ofof RemoteRemote FiberFiber TestingTesting SystemsSystems(RFTS)(RFTS)

    TheThe priceprice ofof thethe currentcurrent RFTS RFTS exceedsexceeds thethe priceprice ofoflocallocal andand accessaccess networksnetworks

    ErrorError--detectiondetection andand errorerror--correctioncorrection raiseraise to to fewfewdaysdays, , eveneven weeksweeks

    New RFTS New RFTS a a lowlow--costcost andand reliablereliable tooltool forfor errorerrordetectiondetection inin locallocal andand accessaccess networksnetworks

  • MeasurementMeasurement systemsystem TheThe newnew systemsystem representsrepresents thethe fundamentalfundamental ((simplestsimplest) ) formform

    ofof thethe future test future test systemsystem MainMain purposepurpose

    ErrorError detectiondetection inin OCS (OCS (mechanicalmechanical faultsfaults oror qualityquality losseslossesinin opticaloptical fibersfibers oror connectorsconnectors))

    MainMain ideaidea ModificationModification ofof thethe currentcurrent RFTS RFTS inin orderorder to to lowerlower itits s priceprice

    New RFTSNew RFTS OTDR OTDR asas mainmain

    measurementmeasurement unitunit OpticalOptical powerpower splittersplitter SoftwareSoftware controlcontrol

    CurrentCurrent RFTSRFTS OTDR OTDR asas mainmain

    measurementmeasurement unitunit OpticalOptical SwitchSwitch SoftwareSoftware controlcontrol

  • MeasurementMeasurement unitunit OTDR OTDR OpticalOptical powerpower splittersplitter

    ControlControl unitunit PCPC SoftwareSoftware PrePre--measurementmeasurement

    managementmanagement PostPost--measurementmeasurement

    managementmanagement SerialSerial interfaceinterface connectionconnection

    (RS232)(RS232)

    MeasurementMeasurement systemsystem architecturearchitecture

  • MeasurementMeasurement processprocess

    1.1. MeasurementMeasurement setupsetup

    2.2. OTDR OTDR launcheslaunches thethe pulsepulse

    3.3. InputInput powerpower isis divideddivided

    4.4. OutputOutput pulsespulses traveltravel throughthroughthethe fiberfiber

    5.5. AllAll scatteredscattered andand reflectedreflectedsignalssignals formform a a complexcomplexmeasurementmeasurement tracetrace

    6.6. OTDR OTDR tracetrace savedsaved inin thethecomputercomputer memorymemory

    7.7. MeasurementMeasurement analysisanalysis

  • ErrorError detectiondetection reference reference measurementmeasurement

    BasedBased on on comparisoncomparison ofof reference reference andand test test measurementsmeasurements Reference Reference measurementsmeasurements performedperformed afterafter thethe installationinstallation ofof

    thethe OCSOCS MeasurementMeasurement pointspoints defineddefined at at characteristiccharacteristic eventsevents on on thethe

    OTDR OTDR tracetrace ((splicessplices, , fiberfiber endend, , connectorconnector reflectionsreflections))

  • ErrorError detectiondetection measurementmeasurement comparisoncomparison

    ErrorError : : TheThe differencedifference ofof thethe powerpower levellevel betweenbetween thethe test test andand

    reference reference measurementsmeasurements, at , at thethe measurementmeasurement pointspoints, , exceedsexceeds a a predefinedpredefined tresholdtreshold levellevel

    Test Test measurementsmeasurements automaticalyautomaticaly performedperformed inin time time intervalsintervals whichwhich varyvary fromfrom 1 1 minmin to 1 to 1 hourhour

  • RFTS RFTS managementmanagement softwaresoftware

    SpeciallySpecially developeddeveloped forfor thethe newnew systemsystem

    The program was developed using the The program was developed using the MicrosoftMicrosoftTMTM Visual BasicVisual BasicTMTM software packagesoftware package

    ThreeThree modulesmodules MainMain module module

    ComparisonComparison modulemodule

    AutomaticAutomatic test moduletest module

    TheThe program program partitionpartition enablesenables a a simplesimple andand fastfastsoftwaresoftware managementmanagement

  • MainMain modulemodule

    FunctionsFunctions :: MeasurementMeasurement setupsetup (OTDR (OTDR setupsetup))

    Reference Reference measurementmeasurement controlcontrol MeasurementMeasurement pointspoints definitiondefinition

    UserUser--friendlyfriendly interfaceinterface easyeasy andand efficientefficientmeasurementmeasurement pointspoints definitiondefinition

    5000,500005000,500001 to 99991 to 999910,20,50,10010,20,50,1001310,15501310,1550

    SpatialSpatial resolutionresolution((numbernumber ofof samplessamples))

    AveragingAveragingtime (s)time (s)

    OutputOutput pulse pulse widthwidth((nsns))

    WavelenghtWavelenght(nm)(nm)

  • MainMain module module useruser interfaceinterface

  • ComparisonComparison modulemodule FunctionsFunctions ::

    Test Test measurementmeasurement controlcontrol Test Test measurementmeasurement resultresult analysisanalysis ErrorError detectiondetection

    AutomaticAutomatic errorerror detectiondetection basedbased on on comparisoncomparison ofof test test andand reference reference measurementmeasurement resultsresults

    GraphicalGraphical UserUser interfaceinterface :: reference reference waveformwaveform windowwindow test test waveformwaveform windowwindow differencedifference waveformwaveform windowwindow bothboth waveformwaveform windowwindow

  • ComparisonComparison module module useruser interfaceinterface

  • AutomaticAutomatic test moduletest module

    ModifiedModified versionversion ofof thethe comparisoncomparison modulemodule FullyFully automatizedautomatized test test measurementsmeasurements andand errorerror

    detectiondetection Module Module parametersparameters ::

    MeasurementMeasurement repetitionrepetition time interval time interval ErrorError tresholdtreshold levellevel

  • MeasurementMeasurement resultsresults

    PowerPower splittersplitter 90/10 90/10 simulatessimulates thethe casecase wherewhere thethe powerpowerisis equallyequally divideddivided to 10 to 10 fibersfibers

    AsAs errorerror casecase wewe disconnecteddisconnected one one fiberfiber

    1000/3000 1000/3000 3000/3000 3000/3000

    (5m (5m differencedifference ))

    1310131015501550

    1010100100

    50/50 50/50 75/2575/2590/1090/10

    Test Test fibersfibers (m)(m)WavelengthWavelength (nm)(nm)Pulse Pulse widthwidth((nsns))PowerPower splittersplitter

    WavelenghtWavelenght, pulse , pulse widthwidth andand powerpower ratioratio dominantlydominantlyinfluence influence thethe measurementmeasurement resultsresults

    MeasurementMeasurement parametersparameters valuesvalues ::

  • NoNoYesYesNoNoYesYesNoNoYesYesNoNoYesYesNoNoYesYesNoNoYesYesErrorErrordetectiondetection

    100100 100100 100100 100100 100100 100100101010101010101010101010Pulse Pulse widthwidth((nsns))

    1550155015501550

    3000/30003000/3000Test Test fiberfiber (m)(m)

    15501550131013101310131013101310WavelengthWavelength(nm)(nm)

    90/1090/1072/2572/2550/5050/50PowerPower splittersplitter

    ErrorError detectiondetection forfor fibersfibers withwith similarsimilar lenghtlenght

  • YesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesErrorErrordetectiondetection

    100100 100100 100100 100100 100100 100100101010101010101010101010Pulse Pulse widthwidth((nsns))

    1550155015501550

    1000/30001000/3000Test Test fiberfiber(m)(m)

    15501550131013101310131013101310WavelengthWavelength(nm)(nm)

    90/1090/1072/2572/2550/5050/50PowerPowersplittersplitter

    ErrorError detectiondetection forfor fibersfibers withwith differentdifferent lenghtlenght

  • TheThe newnew RFTS RFTS a a modificationmodification ofof thethe currentcurrentRFTSRFTS

    ParralelParralel fiberfiber testingtesting usingusing thethe powerpower splittersplitter TestsTests confirmedconfirmed thethe systemsystem efficiencyefficiency

    Future :Future : ActiveActive opticaloptical networknetwork ErrorError locationlocation methodmethod

    SummarySummary