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1、OptimizedPulseShapingforIntra-channelNonlinearitiesMitigationina10GbaudDual-Polarization16-QAMSystemBenoîtChâtelain1,CharlesLaperle2,KimRoberts2,XianXu1,MathieuChagnon1,AndrzejBorowiec2,FrançoisGagnon3,JohnC.Cartledge4,andDavidV.Plant11McGillUniversity,Montreal,Quebec,Canada,
2、H3A2A72CienaCorporation,Ottawa,Ontario,Canada,K2H8E93Écoledetechnologiesupérieure,Montreal,Quebec,Canada,H3C1K34Queen’sUniversity,Kingston,Ontario,Canada,K7L3N6Email:benoit.chatelain@mail.mcgill.caAbstract:Anoptimizedpulseshapeisshowntoreduceintra-channelnonlineareffectsina10
3、Gbauddual-polarization16-QAMEDFA-amplifiedsystemwithoutopticaldispersioncompensation.OCIScodes:(060.2330)Fiberopticscommunications;(060.4080)Modulation1.IntroductionIntra-channelnonlineardistortionisanimportantsourceofsignaldegradationinopticalcommunicationsystemsusingadvance
4、dmodulationformatssuchasquadratureamplitudemodulation(QAM).Itsmainimpactistoreducethemaximalpowerthatcanbelaunchedintothefiber,therebylimitingopticalsignal-to-noiseratio(OSNR)levelsatthereceiver,reducingsystemmarginsandreducingthemaximumpropagationdistancethatcanbeachieved.In
5、thispaper,thenonlineartoleranceofanoptimizedpulseandaroot-raisedcosine(RRC)pulseiscomparedintermsofbiterrorrate(BER)performance,forvaryingpropagationdistancesandlaunchpowers.Experimentalresultsshowthattheoptimizedpulseconsiderablyreducesintra-channelnonlineareffectsinalonghau
6、l,10Gbauddual-polarization(DP)16-QAMsystemrelyingonerbium-dopedfiberamplifiers(EDFAs)andG.652fiber(noopticaldispersioncompensation).Theimprovednonlineartoleranceofthereturn-to-zero(RZ)pulseshapewasrecentlyhighlightedin[1],fora112Gb/sDP-quadraturephaseshiftkeying(QPSK)systemwi
7、thoutopticaldispersioncompensation.ComparingtheRZpulsetothenonreturn-to-zero(NRZ)pulse,theauthorsreportedanincreaseinsinglechannelmaximumpropagationdistanceof18%.However,theimprovednonlineartoleranceachievedusingtheRZpulsecomesattheexpenseofincreasedspectralcontent.Forinstanc
8、e,thebandwidthofa50%RZpulseistwicethebandwidthoftheNRZpulseortheRRCp
