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1、光网络技术发展与展望(韦乐平)DevelopmentandProspectofopticalnetworktechnologyWeiOpticalfibercommunications,afteryearsoffiberbubblesandyearsofsilence,arebeginningtoshowgoodmomentum.Peertopeercommunications(P2P)servicesrepresentedbytheboomingInternetbusiness,mobileb
2、usinesscontinuedtogrowrapidly,IPTVbusinessready,theworldnetworkbandwidthdemandgrowthrateisstillashighas50%to100%.Thesedevelopmentsinthebusinesslevelpresentnewcapabilities,capabilities,andperformancerequirementsforthetelecommunicationsnetwork,thefound
3、ationoftheopticalnetwork.Thefollowingisabriefsummaryandoutlookofseveralhottechnologiesinopticalnetworks.Developmentandapplicationof1and40Gbit/ssystems40Gbit/ssystemmainlyhasthefollowingadvantages:itcanmoreeffectivelyusethetransmissionbandwidth,higher
4、spectrumefficiency;whenthe40Gbit/ssystemcostreducedto10Gbit/sbelow2.5timesthecostofthesystem,wecanachievelarge-scalecommercial,soastoreducethecostoftransmission;1elementinsteadofthe4element,canreducethecost,complexityandOAMthenumberofspareparts;IPcan
5、effectivelyreducethenumberoflinks,improvethescalabilityofnodes,efficiencyandfunctionimprovementofcorenetwork.Inrecentyears,withthepopularityofP2PastherepresentativeofInternetapplicationsduetothenewIPtrafficcontinuestorapidlyincrease,with10Gbit/sbased
6、ontheexistinglong-distanceWDMnetworkhasbeenshowinga"powerless"state,partoftheparagraph80*10Gbit/scapacityisupto40Gbit/s,growwitheachpassingdaytherequirementofWDMsystem,itsapplicationhasbeenontheagendaup.Inadditiontomarketdemandfactors,themainfactorsa
7、ffectingthe40Gbit/ssystemaretechnology,priceandPMD(polarizationmodedispersion)performanceofopticalfibercablelines.Firstofall,fromthetechnicalpointofview,the40Gbit/ssystemafteryearsofdevelopment,intermsoftechnologyhasmadeconsiderableprogress.Canbeappl
8、iedtoavarietyofmodulationtechnologyfordifferentscenes(suchasDQPSK,DP-QPSK,DRZ,DPSK,ODBetc.)havecommercialornearcommercial,variousactivefor40Gbit/sandalargenumberofpassivedeviceswastherapiddeclineinthecost,andthepowerofthevariouscomponentsoftheflatnes
