基于马赫-曾德尔调制器的先进调制格式的产生-何晶

:0258-7025(2008)08-1185-06基于马赫-曾德尔调制器的先进调制格式的产生何晶刘丽敏陈林文双春(,410082)-(MZM)80Gbit/s(RZ-DPSK)(CSRZ-DPSK)(RZ-DQPSK)(CSRZ-DQPSK).MZM80Gbit/sRZ/CSRZ-DPSK,MZM,RZ/CSRZ-DQPSK,,RZ/CSRZ-DQPSK.80Gbit/sRZ/CSRZ-DPSKRZ/CSRZ-DQPSK,CSRZ-DPSKRZ-DPSK,(DQPSK)(DPSK),RZ/CSRZ-DQPSK,.;;-;;TN929.11Adoi:10.3788/CJL20083508.1185GenerationofAdvancedModulationFormatsBasedonMach-ZehnderModulatorsHeJingLiuLiminChenLinWenShuangchun(SchoolofComputerandCommunication,HunanUniversity,Changsha,Hunan410082,China)AbstractAnovelscheme,usingdifferentialMach-Zehndermodulator(DMZM)forgenerationof80Gbit/sreturn-to-zerodifferentialphase-shiftkeyed(RZ-DPSK),carrier-suppressed(CS)RZ-DPSK,return-to-zerodifferentialquadraturephase-shiftkeyed(RZ-DQPSK)andCSRZ-DQPSK,isproposed.TogenerateRZ/CSRZ-DQPSK,itneedsonlytoaddadua-ldriveMZMbasedonthe80Gbit/sRZ/CSRZ-DPSKsignalwhichisgeneratedbyatwodifferentialcascadedMZM.TheproposedmethodofthegenerationofRZ/CSRZ-DPSKandRZ/CSRZ-DQPSKisofexpansibilityandsimplicity.SimulationresultsshowthatCSRZ-DPSKhasamorecompactspectrumthanthatofRZ-DPSK,whiletheDQPSKhasasimilarspectralshapetothatofDPSK,withitsspectrumbeingcompressedbyafactoroftwoduetothehalvedsymbolratefortransmissionatafixedbitrate.Keywordsopticalcommunication;modulationformat;differentialMach-Zehndermodulator;return-to-zero/carrier-suppressedreturn-to-zerodifferentialphase-shiftkeyed;return-to-zero/carrier-suppressedreturn-to-zerodifferentialquadraturephase-shiftkeyed:2007-08-27;:2007-11-12:(20040532005).:(1978)),,,,,.E-mail:[e-mail]:(1966)),,,,,.E-mail:[e-mail]1,,.,,.35820088CHINESEJOURNALOFLASERSVol.35,No.8August,2008,:(DML),(EAM)-(MZM)[1].-,,40Gbit/s,[2].,(DPSK)(DQPSK),,.[3](PM)MZMDPSK,,;MZM.[4]MZM(DE-MZM)/(RZ/CSRZ-DPSK),,,.DQPSK,[5]PM,MZM,/(RZ/CSRZ-DQPSK),MZMP,.MZM80Gbit/sRZ/CSRZ-DPSKRZ/CSRZ-DQPSK,.MZM,(DC)(RF),DCMZM,.22.1RZ/CSRZ-DPSKRZ-DPSKCSRZ-DPSK1.,,.1552.5nm,0.MZM(2)80Gbit/sRZ/CSRZ-DPSK.(40GHz),,RZCSRZ;,220-180Gbit/s.1RZ-DPSKCSRZ-DPSKFig.1GenerationofRZ-DPSKandCSRZ-DPSK2MZMFig.2StructureofdifferentialMZM2MZM,DCRF,.Ein(t)Eout(t)Eout(t)=Ein(t)#h(t),(1)h(t)[6]h(t)=10-L/20{r#exp[jUupper(t)]+(1-r)#exp[jUlower(t)]},(2)r=(1-1/Er)/2,Er=10ER/10,(3)L,r/Y,rER(3),ER,Y50/50,r=1/2.(3).Uupper(t)=PV1(t)VPRF+PVB1VPDC,(4)Ulower(t)=PV2(t)VPRF+PVB2VPDC,(5)V1(t),V2(t)RF,VB1,VB2.VPRF=VPDC=VP,VP,h(t)=10-L/2012expjPVP[V1(t)+VB1]+12expjPVP[V2(t)+VB2],(6)118635(6),MZM80GHz,2VP,VB1,VB2,,.,:1)VB1-VB2=0,V1(t)+V2(t)=2VP,33%RZ;2)VB1-VB2=0,V1(t)+V2(t)=VP,50%RZ;3)VB1-VB2=VP,V1(t)+V2(t)=2VP,66%CSRZ.MZM80Gbit/s,80Gbit/sRZ-DPSKCSRZ-DPSK.2.2RZ/CSRZ-DQPSKRZ-DQPSKCSRZ-DQPSK3,,,.1552.5nm,0.MZMMZM80Gbit/sRZ/CSRZ-DQPSK,MZMRZ/CSRZ-DPSK,MZM220-1(40Gbit/s),DQPSKdR;MZM,MZM,DQPSKdI.3RZ-DQPSKCSRZ-DQPSKFig.3GenerationofRZ-DQPSKandCSRZ-DQPSKDQPSK:0,P/2,P,3P/2.,DQPSK80Gbit/s40Gbit/s,DQPSK.RZ/CSRZ-DPSK,(6)80GHz,2VP,VB1VB22.11)3),33%RZ66%CSRZ;MZMMZM40Gbit/s,80Gbit/sRZ-DQPSKCSRZ-DQPSK.3.DPSK,(DI),,[7].DI,DI,TB(80Gbit/s12.5ps),DI25dB.,DI,,,[1].4DPSK.DPSK100GHz(BPF);TB=1/RDI,R;1A/W(APD)(BPD);60GHz(LPF).4RZ/CSRZ-DPSKFig.4StructureofRZ/CSRZ-DPSKbalanceddetection2.11),RZ-DPSK(5).6DIRZ-DPSK.2.13),CSRZ-DPSK7.8DICSRZ-DPSK.,5(a)7(a),RZ-DPSK,CSRZ-DPSK,,CSRZ-DPSK,,,11878:-5RZ-DPSK(a)(b)Fig.5Spectrum(a)andeyepatterns(b)forRZ-DPSK6RZ-DPSK(a),(b)(c)RZ-DPSKFig.6OpticalspectraandeyepatternsofRZ-DPSKsignalafterdemodulation.(a)outputatconstructiveport;(b)outputatdestructiveport;(c)eyediagramafterbalanceddetection,.5(b)7(b),CSRZ-DPSK66%,RZ-DPSK33%,CSRZ-DPSKRZ-DPSK2,CSRZ-DPSKRZ-DPSK.,(6(a),8(a)),P,(6(b),7CSRZ-DPSK(a)(b)Fig.7Spectrum(a)andeyepatterns(b)forCSRZ-DPSK8CSRZ-DPSK(a),(b)(c)CSRZ-DPSKFig.8OpticalspectraandeyepatternsofCSRZ-DPSKsignalafterdemodulation.(a)outputatconstructiveport;(b)outputatdestructiveport;(c)eyediagramafterbalanceddetection8(b)).DI,,.6(c)8(c),RZ-DPSKCSRZ-DPSK,CSRZ-DPSK118835RZ-DPSK.DQPSK,,,(80Gbit/s25ps),,,DQPSK.P/4,DQPSK,DQPSK,,P/4DQPSK.,.9DQPSK.DQPSK(PS);T=2/R,$U=P/4;1A/WBPD.9RZ/CSRZ-DQPSKFig.9StructureofRZ/CSRZ-DQPSKbalanceddetection2.11),RZ-DQPSK10.3),CSRZ-DQPSK11.DQPSK,,,,RZ/CSRZ-DQPSK,,DQPSK.RZ-DQPSKCSRZ-DQPSK,RZ/CSRZ-DQPSK,,(PMD),CSRZ-DQPSK,RZ-DQPSK,CSRZ-DQPSKPMD.CSRZ-DQPSKRZ-10RZ-DQPSK(a)(b)Fig.10Spectrum(a)andeyepatterns(b)forRZ-DQPSK11CSRZ-DQPSK(a)(b)Fig.11Spectrum(a)andeyepatterns(b)forCSRZ-DQPSKDQPSK,.4MZM80Gbit/sRZ/CSRZ-DPSK,RZ/CSRZ-DQPSK,.,CSRZ-DPSK,RZ-DPSK.DQPSK11898:-DPSK,RZ/CSRZ-DQPSK,,DQPSK,RZ/CSRZ-DQPSK.1PeterJ.Winzer,Ren†-JeanEssiambre.Advancedopticalmodulationformats[J].ProceedingsoftheIEEE,2006,94(5):952~9852ChenXin,WuKeying,MaXiaohongetal..Signalshapingbasedonphasepre-modulationinfibertransmissionsystems[J].ChineseJ.Lasers,2007,34(1):74~77,,.[J].中国激光,2007,34(1):74~773A.Hirano,Y.Miyamoto,S.Kuwahara.PerformancesofCSRZ-DPSKandRZ-DPSKin43Gbit/s/hDWDMG652single-mode-fibertransmission[C].OFC,2003,2(ThE4):454~4564JingwenYang,A.Nirmalathas,Dong-SooLee.RZ/CSRZ-DPSKandchirpedNRZsignalgenerationusingasingle-stagedua-lelectrodeMach-Zehndermodulator[J].IEEEPhoton.Technol.Lett.,2004,16(11):2466~24685R.A.Griffin,R.I.Johnstone,R.G.Walkeretal..10Gb/sopticaldifferentialquadraturephaseshiftkey