All-Optical Delay Circuit using OPC and Distributed Raman Am[lification

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1、All-OpticalDelayCircuitusingOpticalPhaseConjugationandDistributedRamanAmplificationPasuKaewplungandPoonpongPichitkulDepartmentofElectricalEngineering,FacultyofEngineering,ChulalongkornUniversity,Bangkok,THAILAND.E-mail:Pasu.K@Chula.ac.thAbstract-Anovelall-optical

2、delaycircuitbasedonfiberInthisreport,weproposeanovelopticaldelaycircuitloopswhereopticalphaseconjugatorandDistributedRamanbasedon3opticalswitchesand2fiberloops,wheretheamplificationareappliedtosuppressbothKerreffectandopticalphaseconjugationandtheDRAareappliedfor

3、fiberdispersioninordertoextendthedelaytime.ThenumericalsimulationresultshowsthatourproposedopticalproducingtheflatpowermapinordertocompensatethedelaycircuitcangivethemaximumdelaytimeintheorderofKerreffectandthefiberdispersion.Theperformanceofour10msforthedatarate

4、ashighas160Gbit/s.delaycircuitisexaminedbynumericalsimulations.ComparingtoothertypesofdelaycircuitswhichcanI.INTRODUCTIONprovidethemaximumdelaytimesmallerthan10s,ourAllopticaldelaycircuitisanessentialcomponentforsimulationresultsdemonstratethattheproposeddelayrea

5、lizingtheall-opticalpacketswitchingnetworkbecauseitcircuitcangivethemaximumdelaytimelongerthan10mscanprovidethereductionofbothpacketcollisionandforthedatarateashighas160Gbit/s.packetloss,andalsoitisnecessaryforperformingthepacketqueuing[1].However,itistechnologic

6、allyveryII.FIBER-LOOPDELAYCIRCUITEMPLOYINGOPCANDDRAdifficulttodelayanopticalpacketinopticaldomain.ManyopticaldelaycircuitsthathavebeenproposedaremainlyOurproposedall-opticaldelaycircuitisschematicallybasedontwoconfigurations.ThefirstschemeistolettheshowninFig.1.T

7、hedelaycircuitiscomposedof3switches,2long-lengthfiberloops,anopticalphaseopticalpackettransmitinanadditionallengthofaphysicalconjugator(OPC),andopticallumpamplifiers.Anopticalmediasuchastheopticalfiber[2].Thistypeofdelaylinedataframecanbeinjectedintothecircuitbyc

8、ontrollingthebasicallyconsistsofatunableopticalswitchandafiberloop.switch(SW)#1.AfterpassingthroughtheSW#1,thedataTheotherapproachistolettheopticalpackettransm