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1、中国科技论文在线http://www.paper.edu.cnPhotonic-assistedMicrowaveSwitchatSpeedof<100#Picosecond**5FengXia,YanLianshan,JiangHengyun,PanYan,JiangLin,LuoBin,PanWei(CenterforInformationPhotonics&Communications,SouthwestJiaotongUniversity,Chengdu,Sichuan610031)Abstract:Aphotonicapproachtorapid
2、lyswitchtwomicrowavesignalswithdifferentfrequencyor/andphaseisproposed.Weexperimentallyshowthattwomicrowavesignalswithapreciseπphase10differenceat21-and29.425-GHzaresuccessfullyswitchedatthespeedof93.4-,83.3-psrespectively.Keywords:microwavephtonics;microwavesignalsswitch;phasehop
3、ping;Mach-Zehnerinterferometer0Introduction15Fastmicrowavesignalsswitchisveryimportantforthenextgenerationradarsystem,[1,2]cognitiveradionetworkand5Gwirelesscommunicationsetc..Itcanpotentiallyrealizethefastphaseor/andfrequencyhoppingforsecretcommunicationinmilitary.Aftercomparedwi
4、thalltheelectricalones,photonic-assistedmicrowavesignalsswitchhastheadvantagesofwider[2,3]bandwidth,lowerloss,largerandfastertunability,anti-electromagneticinterference,etc..Until20now,severalphotonic-assistapproachestorapidlyswitchtwomicrowavesignalswithdifferencefrequencyhasbeen
5、reportedusingthecombinationofspectralshapingandfrequencytotime[4,5]mapping,combfilterwithultra-fasttunabilityetc..However,theymerelyrealizethefastfrequencyhopping,ratherthantheboth.Fastphasehoppingishighlyrequiredforaphase-arrayantennawitharapidlyreconfigurableemitteddirection.25I
6、nthispaper,anovelapproachtorapidlyswitchtwomicrowavesignalsisdemonstratedatthespeedof<100-ps.Asweknown,ahigh-qualitymicrowavesignalcanbephotonic-assistedgeneratedbybeatingtwocoherentopticalfrequencytonesatthephoto-detector(PD).Whenthreecoherentopticalfrequencytonesarelaunchedintot
7、hePD,twotonescanbeindependentlycontrolledtoappearornotbysettingthebitofbinarydatas′(t)being“1”or“0”,theywould30alternativelybeatingwiththeleftoneinthetimedomain.Therefore,bydynamicallymanipulatingthreeopticalfrequencytones,thetwomicrowavesignalsaregeneratedandrapidlyswitchedbasedo
8、nthebitofdatas′(t).Weexperimental
