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1、光网络技术发展与展望(韦乐平)（DevelopmentandProspectofopticalnetworktechnology(WeiLeping)）DevelopmentandProspectofopticalnetworktechnologyWeiOpticalfibercommunications,afteryearsoffiberbubblesandyearsofsilence,arebeginningtoshowgoodmomentum.Peertopeercommunications(P2
2、P)servicesrepresentedbytheboomingInternetbusiness,mobilebusinesscontinuedtogrowrapidly,IPTVbusinessready,theworldnetworkbandwidthdemandgrowthrateisstillashighas50%to100%.Thesedevelopmentsinthebusinesslevelpresentnewcapabilities,capabilities,andperformanc
3、erequirementsforthetelecommunicationsnetwork,thefoundationoftheopticalnetwork.Thefollowingisabriefsummaryandoutlookofseveralhottechnologiesinopticalnetworks.Developmentandapplicationof1and40Gbit/ssystems40Gbit/ssystemmainlyhasthefollowingadvantages:itcan
4、moreeffectivelyusethetransmissionbandwidth,higherspectrumefficiency;whenthe40Gbit/ssystemcostreducedto10Gbit/sbelow2.5timesthecostofthesystem,wecanachievelarge-scalecommercial,soastoreducethecostoftransmission;1elementinsteadofthe4element,canreducethecos
5、t,complexityandOAMthenumberofspareparts;IPcaneffectivelyreducethenumberoflinks,improvethescalabilityofnodes,efficiencyandfunctionimprovementofcorenetwork.Inrecentyears,withthepopularityofP2PastherepresentativeofInternetapplicationsduetothenewIPtrafficcon
6、tinuestorapidlyincrease,with10Gbit/sbasedontheexistinglong-distanceWDMnetworkhasbeenshowinga"powerless"state,partoftheparagraph80*10Gbit/scapacityisupto40Gbit/s,growwitheachpassingdaytherequirementofWDMsystem,itsapplicationhasbeenontheagendaup.Inaddition
7、tomarketdemandfactors,themainfactorsaffectingthe40Gbit/ssystemaretechnology,priceandPMD(polarizationmodedispersion)performanceofopticalfibercablelines.Firstofall,fromthetechnicalpointofview,the40Gbit/ssystemafteryearsofdevelopment,intermsoftechnologyhasm
8、adeconsiderableprogress.Canbeappliedtoavarietyofmodulationtechnologyfordifferentscenes(suchasDQPSK,DP-QPSK,DRZ,DPSK,ODBetc.)havecommercialornearcommercial,variousactivefor40Gbit/sandalargenumberofpassivedeviceswastherapidd
