计算机相关专业毕业设计用+英文翻译没有论文只有中英文翻译.docx

计算机相关专业毕业设计用+英文翻译没有论文只有中英文翻译.docx

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计算机相关专业毕业设计用+英文翻译没有论文只有中英文翻译

Widebandopticalfiberaccessnetworktrendofdevelopment

Author:

LiuJinhaiarticlesource:

Computeruniversaltime:

2005-3-8

Thisarticlefirstisbriefintroducedtheworldbroadbandaccessnetworkdevelopstheconditionandthemainapplication,nextnarratedthewidebandopticalfiberaccessnetworkmerit.Withemphasishasoncemoreanalyzedthewidebandpoint-to-pointactiveEthernetopticalfibersystemandthewidebandtothepassiveopticalfibersystemcharacteristicandtheapplication.Meetsdownproposedourcountryopticalfiberaccessnetworksendschem.possibletosurmountAPON,BPONandtheEPONstage,startsfromthewidebandpoint-to-pointEthernetopticalfibersystemandGEPON,finallyandeventransitstotheGPONstagepreliminaryidea.Finallyanalyzedtheopticalfibercommunicationstechnologytrendofdevelopmentfromeachangle.

Thebroadbandaccessnetworkdevelopsconditionandmainapplication

Infact,lookingfromthetelecommunicationdevelopmenthistory,whenthenetworknumberofusersachievescertainscale.Eachkindofapplicationmeetsthenatureproduction;thisalsoisso-calledstepstheCufflawmighttobeatespecially.Inthehistoryonekindoftechnologysincebirthhasnotbeenhavingabigpileofapplication,regardlessofisthemobilecommunicationortheInternet,onitsshortnote,thebrowsing,thenetchatsandsoonthekeyapplicationsallisdevelopscertaindegreeaftertheuserscaletoproducenaturally,butisnotsedulouslydesignsbeforehandplans.

Sincehasenteredforthe21stcentury,thewholeworldbroadbandaccessnetworkenteredthebigdevelopmentphase.To2004year'send,thetotalnumberofusersalreadyachieved150,000,000,becameintheelectricityreliablehistoricalaccounttodeveloponeofquickesttelecommunicationservices,andevenwasalsoquickerthanthemobileservice.Forexamplethewholeworldmobileservicefrom10,000,000developedto100,000,000hasspentfor5.5years,butthebroadbandaccessservicehasonlyusedfor3.5years.AccordingtotheIDCforecast,in2007theglobalwidebandtotalusermayachieve209,000,000,inwhich9.9,namelyabout20,000,000usersforopticalfiberaccessnetwork.

TheAsianandPacificarea,speciallySouthKorea'sandJapanwerethebroadbandaccessdeveloptheswiftestmostandviolentcountry,theSouthKoreanwidebandusertotalalreadybreakthrough10,000,000,thewidebandpopularrateoccupiedtheworldfirst,holdfamily7Internet90%.JapaneseGovernmentalsovigorouslyadvancesthewidebanddevelopmentthrougheachmeasure,plansin2005toenhancethewidebandusertotalto30,000,000,inwhichFTTHachieves110,000.USstillistheworldbiggestbroadbandaccessmarket,thetotalnumberofuserssurpasses30,000,000.AmericanFOCthewidebandservicelocalizationisoneof2003-2008yearsixbiggoals,infactthebroadbandaccessisbecomingtheAmericanuniversalservicethenextgoal.TheUSbroadbandaccessisprimarilydevelopsbythecabletelevisionandADSL,becausethetelecommunicationcontrolpolicyencouragementusesthenewtechnicalconstructionnetwork（e.g.FCCstipulationoperationbusinessconstructionopticalfiberaccessnetworktobepossiblenotlimitedthepressurewhichinlocalringcircuitnon-colligationpolicy）aswellasthecompetitionandtheservicegrows,recentlyleadstheoperationbusinesstobeextremelypositivetotheopticalfibertothestation（FTTP）development.

Speakingoftheopticalfiberaccessnetwork,speciallytheopticalfibertostation（FTTP）oropticalfiberproficient（FTTH）,thewholeworldalreadystartedtoentertheunloadingphase,onlyUShad270FTTPprojects,wasmostlythelocalauthority,thepubliccompany,thepropertydeveloperandthenon-leadingtelecommunicationoperationbusinessproject.Leadingoperationbusinessalsostartstoenterthisdomain,inwhichVersionplansin2005tocomplete3,000,000FTTP;SBCintheplanplansin2007initshuge“speedoflight”toreach18,000,000FTTN,eachhouseholdhasspeed20-39Mb/s,providestheend-to-endtertiaryservicecolligation（triteplay）theservice.JapanisintheworldadvancestheFTTHmostradicalcountry,2.004yearsitsopticalfiberonalreadyunderstoodmorethan18,000,000householdsfamilies,buttheuserdevelopmentlag,probablywas2,000,000,in2005plansdevelops10,000,000.Europequiteissteadyconservatively,FTTHaltogetherhaslaidto2004500,000,some167smallprojectsortheexperimentalprojectarecarryingon.

Ourcountrybroadbandaccessnetworkextremelyisalsorapidintheneartwoyeardevelopment,accordingtothepreliminarystatistics,to2004year'sendourcountrywidebanduseris25,000,000,becomesisinferiortoUS'ssecondbigbroadbandaccessmarket,inwhichleadershiptechnologyisonlyADSL,probablyaccountsforabout70%,nextistheEthernettechnology,butalsohasfewwidebandwirelessturningonandelectriccablemodemturningon,alsooccupiesregardingtheFTTHtechnologythetrackstage,theminoritydevelopedcityalreadywasalsostartingtoconsiderandtoexperimenteachkindofFTTHItechnology.

Lookingfromthewidebandapplicationthat,accordingtotheAmericanMaiKenxiCompany'snewestanalysis,theinitialperiodwidebandapplicationmainlyisthehighspeedsurfer,maymakethesurferthetimetoincreaseapproximately30%.Hereafter,alongwiththeservicelarge-scaledevelopment,developsthepowerwhichthenewservicebecomescontinuestodevelop.AccordingtoAmericanBHKCorporationdemonstratedin2004investigationresultthat,in2003theAmericanfirstfivewidebandexpensewasonthenetgambles,theadultprogram,thegame,musicdownloadingandtheselectionandbroadcasttelevision,hadobviouslytotheexpenseclassinclinetendency.

Needstopointoutthat,discussesneedstopayattentiontoinabasicunderstandingusingtheactuationtheerroneouszone,namelycannotplacehopesinartificiallystudiesbeforehanddevelops12itemsso-called“theAssassin'smaceapplication”,promotedapplication.Infact,lookingfromthetelecommunicationdevelopmenthistory,whenthenetworknumberofusersachievedcertainscale,eachkindofapplicationmeetsthenatureproduction;thisalsoisso-calledstepstheCufflawmighttobeatespecially.Inthehistoryonekindoftechnologysincebirthhasnotbeenhavingabigpileofapplication,regardlessofisthemobilecommunicationortheInternet,onitsshortnote,thebrowsing,thenetchatsandsoonthekeyapplicationsallisdevelopscertaindegreeaftertheuserscaletoproducenaturally,butisnotsedulouslydesignsbeforehandplans.

Widebandopticalfiberaccessnetworksuperiority

Alongwiththeopticalfiberinthetollnetwork,themetropolitanareanetworkandeventheaccessnetworkbranchsectionmassiveapplications,thelogicaltrendofdevelopmentwillbecontinuestotheaccessnetworktomatchthelinesegmentandtodirecttheinletparttoextend,thekeyisadvancesthespeedquickly?

Thiswillbedecidedbymanykindsoffactors,includingthemarketdemand,thecompetitionneed,theapplicationstimulation,thetechnicalprogress,thecostdropandnecessarywilltransportAugursystemdevelopmentandsoon.Ourcountryin2008willholdtheOlympicGamesandin2010holdsworldexpothesetwobigeventstoacertainextenttobeabletoadvancethewidebandopticalfiberaccessnetworkthedevelopment

Belowmainlywillanalyzeseveralkindofmainwidebandopticalfiberturningontechnologyfromthesystemtechnologyanglethecharacteristic,thequestionandthetrendofdevelopment.Certainly,besidesthesystemtechnology,affectsitsapplicationthefactortobeverymany,mainlyistheserviceandtheapplicationaswellasthecontrolpolicy.Inaddition,eachkindofnecessaryprimarydevicetechnologyandtheplacinginstallmenttesttechnologyextremelyisalsoessential.Atpresentthelowcostphotosourcehopefullyhasrealized,850nmVCSELonlyseveralUSdollars,1310nmVOSELhadthebreakthrough,thespeedreaches10Gb/s.ThePLCmixintegrationtechnology,thehighdensitylowcostopticalcableandthecorrelationtechnology,usestheopticalfibertothecurvinginsensitiveroomin,thelowcostpassivecomponent,workthetechnology,theautomaticlightoperationtestsystemandsoonalsoallisaffectsthelightaccessnetworkpromotionapplicationthekeyaspect,needstohavetheproperlysolution.

Thepoint-to-pointactiveEthernet

Becausesystemthecost,thequality,themanagement,thesecurityandsoonmanykindsoffactors,theEthernetstillhadfurthertoimproveasthepublicnetworkturningonway.

ThetraditionalEthernetbelongstotheuserinnetwork（cPN）.Howeveritsapplicationactuallyintoincludetheaccessnetworkotherpublicnetworkdomainexpansion.Inthehistory,regardingbusinessuserapplicationenvironment,theEthernettechnologyalwaysisthemostpopularmethod,atpresenthasbecomeonlydefinitelyinthepowersupplyreceptaclesecondbighousingandtheofficepublicfacilityconnection.UsestheEthernetishadthehugenetworkfoundationandthelong-termexperienceknowledge,atpresentallpopularoperatingsystemandtheapplicationasthebusinessuserturningonmethodprimarycausealsoalliswiththeEthernetcompatible,theperformancepricecomparedtogood,theextendibility,easytoinstalltheclearaswellasredundantreliableandsoon.

Regardingthepublicnetworkhousinguserapplicationenvironment,thepoint-to-pointactiveEthernetsystemusestheactiveservicefocuspointtosubstitutethepassivepoint-multipointsystemthepassivecomponent,enablesthetransmittingrangetobepossibletoexpandto120kilometerfar.Themainmerit