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1、ABSl融～CTABSTRACTWDM-PONusingwavelengthdivisionmultiplexingtechnologyprovidesahigherbandwidthtoaccessIntemet．Itachievesatrulysuperbroadbandsymmetricaccessnetwork．WDM—PONhasinheritedalltheadvantagesofPONavoidingsomeofthePON’stechnicalproblems．forexampletheONUranging．Italso
2、hasobviousadvantagesinsystemupgradingandnetworkmanagement．Astechnologyadvances，thecostofWDMopticalcomponents，especiallythepassiveopticalcomponentsdecrease，WDM—PONaccessnetworktechnologywillbethedevelopmentofapredictabletrend,andmaybetheultimatesolutionforaccessnetworks．I
3、tisnecessarytodoresearchinthewaythatWDM—PONaccessbackbonenetwork．Thenetworkconnectionsofthetwodifferentaccessnetworkshavebeenanalysed．ThenusingtheOPNETnetworkmodel，thetwoaccessmethodshavebeensimulatedrespectively．Intheconditionsthattheinternaldataindifferentproportionsan
4、ddifferentnetworkload，threekindsofdata013thetwonetworkshavebeensimulatedandcomparedrespectively．Simulationresultsshowthatthesecondaccessmethodeouldreducethenetworkdatadelaybetterandimprovenetworkperformance．DynamicwavelengthandslotallocationalgorithminWDM-PONisalsooneoft
5、hemostpopularresearches，andnOWthereis110standardalgorithm．Thereforefromanalysisofamoreclassicdynamicwavelengthslotallocationalgorithm，anewalgorithmhasbeenputforward．ThenewalgorithmprovidesalterabledefaltbandwidthforeachONUatthebeginningofeachperiod．ThenusingtheOPNETnetwo
6、rkmodel，thetwoalgorithmshavebeensimulatedandcompared．Simulationresultsshowthatthenewalgorithmcouldreducethenetworkdatadelayandcouldn’tdegradthenetworkbandwidthutilization．EachONUsharedbandwidthfaimlyintheIICWalgorithm．Key'words：WDM—PON，AccessMethods，DynamicWavelengthands
7、lotAllocation，OPNETSimulatiOIlIl圖目錄圖目錄圖2．1WDM．PON網(wǎng)絡(luò)體系參考模型．．7圖2．2波長固定的WDM—PON示意圖．9圖2．3波長共享的WDM．PON示意圖．．1O圖2_4寬譜光源的WDM．PON示意圖．．12圖2—5無光源ONU的WDM．PON示意圖13圖2-6第一種連接方法．19圖2．7第二種連接方法20圖3．1第一種方法網(wǎng)絡(luò)模型．23圖3．2第二種方法網(wǎng)絡(luò)模型24圖3．3上行數(shù)據(jù)包格式25圖3-4下行數(shù)據(jù)包格式25圖3．5報(bào)告包格式26圖3．6令牌包格式26圖3—7Src節(jié)點(diǎn)模型．．27
8、圖3．8ONU節(jié)點(diǎn)模型27圖3-9ODN的節(jié)點(diǎn)模型28圖3．10OLT節(jié)點(diǎn)模型29圖3．11WDM．PON輸入端口節(jié)點(diǎn)模型129圖3．12WDM．PON輸入端口節(jié)點(diǎn)模型230圖3．13骨干網(wǎng)端口節(jié)點(diǎn)模型．．
