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1、©2009OSA/OFC/NFOEC2009OTuO6.pdfOTuO6.pdfa1583_1.pdfWaveletTransformBasedOpticalOFDMÖmerBulakci(1),MatthiasSchuster(2),Christian-AlexanderBunge(2),BernhardSpinnler(3),NorbertHanik(4)1:StudentatTechnischeUniversitätMünchen,Dept.ofElectr.Engineering&Inf.Technology,Munich,Germany,omer.bulakci@mytum
2、.de2:FachgebietHochfrequenztechnik,TechnischeUniversitätBerlin,Berlin,Germany,matthias.schuster@tu-berlin.de3:NokiaSiemensNetworksGmbH&Co.KG,COO,IPTransport,Munich,Germany,bernhard.spinnler@nsn.com4:TechnischeUniversitätMünchen,Dept.ofElectr.Engineering&Inf.Technology,Munich,Germany,norbert.han
3、ik@tum.deAbstract:WavelettransformbasedOFDMisproposedtoincreasethedispersiontoleranceofopticalOFDM.FormoderateaccumulateddispersiontheperformanceisshowntobecomparablewithFouriertransformbasedopticalOFDMwith10%cyclicprefix.©2009OpticalSocietyofAmericaOCISCodes:(060.2360)Fiberopticslinksandsubsys
4、tems;(060.4080)Modulation1.IntroductionOrthogonalfrequency-divisionmultiplexing(OFDM)isapromisingmodulationtechniquewellknownfromwirelessandwiredcommunications,whichrecentlyhasalsobeendiscussedforopticalcommunications.Amajorreasonisthatitcanbedesignedtobeextremelytoleranttochromaticdispersion(C
5、D)[1,2].AnothermainadvantageisitshighflexibilityasforexamplethedataratecanbeadaptedeasilytotheavailableOSNR[3].ConventionalOFDMimplementationutilizesFouriertransformastheorthogonaltransformtogeneratethesignalwaveformfromdenselyspacedlow-ratesubcarriers.Thesesubcarriersareorthogonal,whichistheke
6、yfeatureofOFDMtopreventinter-carrierinterference(ICI).Assinusoidsareinfinitelylongintimedomain,aproperwindowinghastobeapplied,whichconsequentlycausesout-of-bandradiationinfrequencydomainandperformancedegradationondispersivechannelsbecauseofinter-symbolinterference(ISI)[4].InordertopreventISIdue
7、toCD,acyclicprefix(CP)canbeappendedtoeachOFDMblock,whichincreasesthetolerancetoCDsignificantly.However,theadditionofCPimposesanincreaseinrequiredbandwidthandsamplingrateofDA/AD-converterswhicharealreadyattheirlimitsforhighdatarate
