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相位取样型光纤光栅多信道幅频与相频滤波性能研究的中期报告Abstract:Thisreportpresentstheresearchprogressontheperformancestudyofamplitude-frequencyandphase-frequencyfilteringofmulti-channelfiberBragggratingsbasedonphasesampling.Thereportincludesabriefintroductiontotheresearchbackground,researchobjectives,researchmethods,andresearchprogress.Additionally,thereportsummarizestheresultsoftheamplitude-frequencyandphase-frequencyfilteringperformanceanalysis,anddiscussesthepotentialapplicationsoftheproposedmulti-channelfiberBragggratings.Introduction:FiberBragggratings(FBGs)areoneofthemostimportantopticaldevicesusedforvariousapplicationsincommunication,sensing,andmetrology.FBGscanbeusedaswavelengthfilters,dispersioncompensators,andsensingelements.OneofthemostimportantfeaturesofFBGsistheirabilitytoreflectlightwithacertainwavelength,makingthemapromisingtoolformulti-wavelengthsystemapplications.However,traditionalFBGscanonlyreflectlightinasinglewavelengthband,whichlimitstheirpotentialapplications.Toovercomethislimitation,multi-channelFBGshavebeenproposedandinvestigatedinrecentyears.Multi-channelFBGscanprovidemultiplereflectionbands,whichcanbeusedforwavelengthdivisionmultiplexing(WDM)applications.Amongdifferenttypesofmulti-channelFBGs,phasesamplingFBGshaveattractedalotofattentionduetotheiruniqueproperties.IntheseFBGs,thephaseofthereflectionspectrumissampledperiodicallyalongthegratingstructure,whichallowsthegenerationofmultiplereflectionbands.Additionally,phasesamplingFBGscanprovidehighreflectivityandlowcrosstalkbetweenthereflectionbands.Duetotheseuniqueproperties,phasesamplingFBGshavebeenwidelyinvestigatedforvariousapplications,suchasWDMsystems,fiberlasers,signalprocessing,andsensing.ResearchObjectives:Themainobjectiveofthisresearchistoinvestigatetheamplitude-frequencyandphase-frequencyfilteringperformancesofmulti-channelFBGsbasedonphasesampling.Specifically,thefollowingobjectiveswillbeaddressed:1.Investigatethereflectionspectraofmulti-channelFBGsbasedonphasesamplingandtheirdependenceonthesamplingper
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