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1、DesignofWavelengthConvertingSwitchesforOpticalBurstSwitchingJeyashankherRamamirthamandJonathanTurnerWUCS-01-21August7,2001DepartmentOfComputerScience,WashingtonUniversityinSt.Louis,CampusBox1045,OneBrookingsDrive,St.Louis,MO63130.DesignofWavelengthConvertingSwitchesf
2、orOpticalBurstSwitchingJeyashankherRamamirtham,JonathanTurnerAbstractOpticalBurstSwitching(OBS)isanexperimentalnetworktechnologythatenablestheconstructionofveryhighcapacityrouters,usingopticaldatapathsandelectroniccontrol.Inthispaper,westudytwodesignsforwavelengthc
3、onvertingswitchesthataresuitableforuseinopticalburstswitchingsystemsandevaluatetheirperformance.Bothdesignsusetunablelaserstoimplementwavelengthconversion.Oneisastrictlynonblockingdesign,thatalsorequiresopticalcrossbars.ThesecondsubstitutesWavelengthGratingRouters(WG
4、R)fortheopticalcrossbars,reducingcost,butintroducingsomepotentialforblocking.WeshowhowtheroutingproblemfortheWGR-basedswitchescanbeformulatedasacombinatorialpuzzleorgame,inwhichthedesignofthegameboardcorrespondstothepatternofinterconnectionsusedtojointheinputsections
5、oftheswitchtotheoutputsections.Weusethistoshowhowtheinterconnectionpatternaffectstheperformanceoftheswitch,andtofacilitatethedesignofinterconnectionpatternsthatyieldthebestperformance.Ourresultsshowthatforatypicalswitchconfiguration,theWGR-baseddesigncandelivermoretha
6、n87%ofthethroughputofafullynonblockingswitch.1IntroductionThetransmissioncapacityofopticalfibershasbeenincreasingatatremendousrateasaresultofDWDMtechnology.AlthoughterabitcapacityIProutersbasedonelectronicsarenowstartingtoappear,thereremainsaseriousmismatchbetweenthet
7、ransmissioncapacityofDWDMfibersandtheswitchingcapacityofelectronicrouters.SinceDWDMThisworkissupportedbytheAdvancedResearchProjectsAgencyandRomeLaboratory(contractF30602-97-1-0273)J.RamamirthamandJ.TurnerarewithAppliedResearchLaboratory,DepartmentofComputerScience,W
8、ashingtonUniversityinSt.Louis.E-mail:jai,jst@arl.wustl.edu1linksarecapableofsupportinghundredsofchannelsoperatingatratesof10Gb/se
