a new approach to remote fiber testing in optical networks
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
NETWORKSNETWORKSKreKreššoo ŽŽmakmak
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 itit’’s 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