wdmpon的接入方法及dba算法的研究

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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图目录图目录图2．1WDM．PON网络体系参考模型．．7图2．2波长固定的WDM—PON示意图．9图2．3波长共享的WDM．PON示意图．．1O图2_4宽谱光源的WDM．PON示意图．．12图2—5无光源ONU的WDM．PON示意图13图2-6第一种连接方法．19图2．7第二种连接方法20图3．1第一种方法网络模型．23图3．2第二种方法网络模型24图3．3上行数据包格式25图3-4下行数据包格式25图3．5报告包格式26图3．6令牌包格式26图3—7Src节点模型．．27

8、图3．8ONU节点模型27图3-9ODN的节点模型28图3．10OLT节点模型29图3．11WDM．PON输入端口节点模型129图3．12WDM．PON输入端口节点模型230图3．13骨干网端口节点模型．．