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基于偏振调制器的可变超宽带脉冲产生(英文).docx

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基于偏振调制器的可变超宽带脉冲产生(英文) Introduction Ultra-wideband(UWB)technologyhasgainedanincreasinginterestinrecentyearsforitsuniqueproperties,suchashighdatarate,lowpowerconsumption,andhigh-resolutionimaging.TheuseofUWBpulsestotriggerradarsystemshasbeenoneofthesignificantapplicationsofthistechnology.ThepulsegenerationtechniqueplaysacrucialroleinUWBsystems,whichneedstoensurethedesiredsignalcharacteristics,suchaspulseduration,shape,andamplitude. OneofthemostpopulartechniquesforUWBpulsegenerationistheuseofapolarizationmodulator.Inthisresearchpaper,wewillexploretheuseofapolarizationmodulatortogeneratevariableUWBpulses.Thepaperisstructuredasfollows.Section2providesanoverviewofUWBpulsegenerationtechniques.Section3describesthepolarizationmodulatortechnique.Section4presentssimulationresults,andSection5concludesthepaper. UWBPulseGenerationTechniques Whileseveralpulsegenerationtechniquesexist,wepresentheresomeofthemostpopularones. 1.ImpulseRadio(IR)-OneoftheearliestmethodsofgeneratingUWBpulsesisImpulseRadio(IR).Inthistechnique,pulsesaregeneratedusingelectricaldischargesinagaschamberorsemiconductorjunction.Thepulsedurationistypicallyshort,intherangeofafewnanoseconds.Thistechniqueissimpleandrequireslowpower,butitsrangeislimited. 2.Time-DomainReflectometry(TDR)-AnothermethodofpulsegenerationisTime-DomainReflectometry(TDR).Inthistechnique,apulseistransmitteddownatransmissionlineandisreflectedatthetarget.Thereflectedpulse'stimedelayandamplitudecanprovideinformationaboutthetarget.ThepulsedurationislongerthanIR,typicallyintherangeofafewhundredpicosecondstoafewnanoseconds. 3.StepRecoveryDiode(SRD)-StepRecoveryDiode(SRD)isanothermethodofUWBpulsegeneration.TheSRDgeneratesapulsebyremovingastepfromanoscillator'swaveform,resultinginashortpulse.Thistechniqueislowcost,butthepulsedurationandshapearenotwidelytunable. PolarizationModulatorTechnique Thepolarizationmodulatortechniqueisbasedonthemanipulationoflight'spolarizationusinganelectro-opticmaterial.AUWBpulsecanbegeneratedbymodulatingthepolarizationofac