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1、Generationand1,200-kmTransmissionof448-Gb/sETDM56-GbaudPDM16-QAMusingaSingleI/QModulator(1)(1)(1)(2)(2)(3)P.J.Winzer,A.H.Gnauck,S.Chandrasekhar,S.Draving,J.Evangelista,andB.Zhu(1)BellLabs,Alcatel-Lucent,791HolmdelRd,Holmdel,NJ,USA,peter.winzer@alcatel-lucent.com(2)Agilen
2、tTechnologies,5301StevensCreekBlvd,SantaClaraCA95051,USA(3)OFSLabs,19SchoolhouseRd,Somerset,NJ,08873,USAAbstractWegenerate56-GbaudPDM16-QAMusingelectronictime-divisionmultiplexing(ETDM)andafour-level-drivenI/Qmodulator.The448-Gb/sline-ratesignalistransmittedover1,200kmof
3、ultra-large-areafiberandcoherentlyreceivedbytwo32.5-GHzoscilloscopeswith>5.5effectivebits.IntroductionWiththerecentcommercializationof100-Gb/stechnologies,researchisfocusingonscalingper-channelbitratesbeyond100Gb/s,withthegoaltodevelopspectrallyefficientopticalinter-1fac
4、esforthenextEthernetstandards,likelyat400Gb/sand1Tb/s.Approachesincludeelec-tronicand/oropticalorthogonalsub-carriermulti-2Fig.1:EvolutionofETDMserialbitrates.plexingandsingle-carriermultilevelmodulationathighsymbolrates3-6.Thelatterallowsforaperpolarization,cf.Fig.1).We
5、transmitthissimplertransmitterstructureatapproximatelysignalover1,200kmofultra-largeareafiber.equalreceiveranddigitalsignalprocessing56-GbaudPDM16-QAMTransmitter7complexity.Usingelectronictime-divisionmulti-TheexperimentalsetupisshowninFig.2.Aplexing(ETDM)atbothtransmitt
6、erandreceiver,tunableexternal-cavitylaser(ECL)at192.7THzsingle-carriersystemswithpolarization-division(1555.74nm)with~100kHzlinewidthismodu-multiplexing(PDM)havedemonstrateduptolatedusinganintegratedLiNbO3double-nested8,94240Gb/s,usingdirectorcoherentdetectionMach-Zehnde
7、rmodulator(MZM)with35-GHz3-andcomplexmodulatorstructures.UsingadBbandwidthandVof2.2V.Thein-phase(I)singlequadrature(I/Q)modulator,per-channelandquadrature(Q)branchesofthemodulatorbitratesofupto224Gb/shavebeendemons-aredrivenby56-Gbaudfour-levelelectricaltrated,bothwith
8、28-Gbaud16-aryquadraturesequences5,whicharederivedfrom56-Gb/s5,6amplitudemodulation(16-QAM)andwith56-bi
