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1、5314JOURNALOFLIGHTWAVETECHNOLOGY,VOL.27,NO.23,DECEMBER1,2009InstantaneousMicrowaveFrequencyMeasurementWithImprovedMeasurementRangeandResolutionBasedonSimultaneousPhaseModulationandIntensityModulationXihuaZou,ShilongPan,andJianpingYao,SeniorMember,IEEE,Member,OSA
2、Abstract—Anovelapproachtoimplementinginstantaneousdomainalsooffersotheradvantagessuchaslowloss,lightmicrowavefrequencymeasurementbasedonsimultaneousopticalweight,andimmunitytoelectromagneticinterference.Inthephasemodulationandintensitymodulationwithimprovedmea-p
3、astfewyears,numerousopticaltechniqueshavebeenpro-surementrangeandresolutionisproposedandexperimentallyposedtoimplementmicrowavefrequencymeasurement.In[1],demonstrated.Thesimultaneousopticalphasemodulationandintensitymodulationareimplementedusingapolarizationmodu
4、-atunableFabry-Perotinterferometerwasusedasanopticallator(PolM)inconjunctionwithanopticalpolarizer.Thephase-scanningreceiverformicrowavefrequencymeasurement;aandintensity-modulatedopticalsignalsarethensenttoadisper-resolutionof90MHzwithinascanningrangeof40GHzwas
5、siveelement,tointroducechromaticdispersions,whichresultsinachieved.Duetothelongscanningtime,themeasurementisnottwocomplementarydispersion-inducedpowerpenaltyfunctions.instantaneous.Formanyapplications,however,instantaneousTheratiobetweenthetwopowerpenaltyfunctio
6、nshasauniquerelationshipwiththemicrowavefrequency.Therefore,bymea-frequencymeasurementisneeded.Ingeneral,instantaneoussuringthemicrowavepowersandcalculatingthepowerratio,thefrequencymeasurementintheopticaldomaincanbeclassifiedmicrowavefrequencycanbeestimated.Than
7、kstothecomplemen-intotwocategories.Inthefirstcategory,anopticalchannelizertarynatureofthepowerpenaltyfunctions,apowerratiohavingisused[2]–[6].In[2],thespectrumofamicrowavesignalwasafasterchangerateversustheinputfrequency,i.e.,agreatermeasuredbymodulatingthemicrow
8、avesignalonanopticalfirst-orderderivative,isresulted,whichensuresanimprovedmeasurementrangeandresolution.Theproposedapproachcarrierandthensenttoawaveguide-basedoptical
