共享型wdmpon介质访问控制方法的研究

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1、ABSTRACTABSTRACTWiththerapidlydevelopmentofcommunicationtechnologies，peoplearedemandingformoreandmorenetworkbandwidth．Thecommunicationnetworkwhichhasmainlyservedthevoicebecomeincreasinglyinsufficient．Asthetechnologiesofthevideochatting,onlinemovieandothermultimediabecomepopular谢

2、thpeople，whichurgenttheproddertoin．easethebandwidthsubstantially．NowthepresenttechnologyCallbasicallymeetthepeople’sneedsbyincreasingthebandwidthofbackboneandlocalareanetworks，butthe”lastmile”accessnetworkbecomesabottlenecksection．PassiveOpticalNetwork(PON)technologybreakingdown

3、thetraditionalpointtopointcommunicationmethod,withitslow-cost，reliableandstableperformance，theprovisionoftransparenttransmissioncapacityofbroadbandaccessnetwork，becomeaneffectivesolution．Fromthe20thcenturyin80yearstonow,PONhasexperiencedseveralstagesofdevelopmentasAPON／BPON，EPON

4、，GPON．However,theuplinkdirectionofseveralaccesstechnologieshaveonlyasinglechannel，andalluserssharethebandwidthofthelinkcapacity．Withthedevdopmentofservices，whichareheavyinbilateral，suchasthevideoservicescet,makethetraditionalacGessmethodsinsufficient．IfWDMtechnologywillbeapplied

5、tothePONnetwork,itCanmaketheuplinkfromasingleintoanumber,andresolvetheproblemofuplinktightsituation．Usingwhatkindofmediaaccesscontrolmethodstomakefulluseofupstreambandwidthhasbeenahotspotsforstudying．HerewefirstlyanalyzethestructureandworkingprincipleofsharingWDM-PONnetwork．Wepr

6、oposedasimplebandwidthallocationalgorithm，andthenbuiltthecorrespondingnetworkinOPNETplatform．Thenstudytheinfluenceoftuningtimeonthesystemperformance，andpresentamatchalgorithmwhichuseadjacentbeforeandaftertimeslots．Aimingtoresolvethecosilyexpenseofnetworkingissue，weusetwofixedtra

7、nsmitterstoreplacethetunabletransmitters，andverifyitsfeasibility．Finally,weimprovethesimplealgorithm，andmakeaeomparesionbetweenthem．Keyword：WDM—PeN，BandwidthAllocation，TuningTime，MatchingⅡ独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作及取得的研究成果。据我所知，除了文中特别加以标注和致谢的地方外，论文中不包含其他人已经发表或撰写过的研究成果，也不包

8、含为获得电子科技大学或其它教育机构的学位或证书而使用过的材料。与我一同工作的同志对本研究所做的