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1、Laser&Photon.Rev.3,No.1–2,123–137(2009)/DOI10.1002/lpor.200810024123AbstractTherehasbeenanincreasinginterestinphotonicgenerationofRFsignalsinthemillimeter-wave(30GHz∼Light300GHz)and/orterahertz-wave(0.1THz∼10THz)regions,andphotodiodesplayakeyroleinit.Thispaperreviewsre-cen
2、tprogressinthehigh-powerRFphotodiodessuchasUni-Traveling-Carrier-Photodiodes(UTC-PDs),whichoperateatthesefrequencies.Severalapproachestoincreasingboththebandwidthandoutputpowerofphotodiodesarediscussed,andRFsignalpromisingapplicationstobroadbandwirelesscommunicationsandspe
3、ctroscopicsensingaredescribed.PhotodiodeAntennaPhotodiodechipisbondedtothesubstratewiththeantenna.ThisisasymbolicfigureofRFphotonicsinthisarticle.©2009byWILEY-VCHVerlagGmbH&Co.KGaA,WeinheimHigh-powerRFphotodiodesandtheirapplicationsTadaoNagatsuma1,2,*,HiroshiIto3,andTadaoIs
4、hibashi41GraduateSchoolofEngineeringScience,OsakaUniversity,1-3Machikanemaya,Toyonaka,Osaka560-8531,Japan2NTTMicrosystemIntegrationLaboratories,3-1MorinosatoWakamiya,Atsugi,Kanagawa243-0198,Japan3CenterforNaturalSciences,KitasatoUniversity,1-15-1Kitasato,Sagamihara,Kanagaw
5、a228-8555,Japan4NTTElectronicsCorporation,3-1MorinosatoWakamiya,Atsugi,Kanagawa243-0198,JapanReceived:6June2008,Revised:14July2008,Accepted:18July2008Publishedonline:3September2008Keywords:Highfrequency,highpower,photodiode,uni-traveling-carrierphotodiode,spectroscopy,wire
6、lesslink.PACS:85.60.Dw,84.40.-x,07.57.Hm,07.57.Pt,84.40.Ua1.Introductionhigh-frequencyRFsignalsoverlongdistances[9].Inthisscheme,optical-to-electrical(O-E)converters,orphoto-Researchonexploringmillimeter-waves(MMWs)andter-diodes,whichoperateatlongopticalwavelengths(1.3–ahe
7、rtz(THz)waves,whichcoverthefrequencyrangefrom1.55μm),playakeyrole,andhigh-output-currentoperation30GHzto10THz,haslatelybecomeveryactive,sinceisrequiredinadditiontohigh-frequencyoperationforprac-natureoftheseelectromagneticwavesissuitedtospectro-ticalapplications.Amongvario
8、ustypesoflong-wavelengthscopicsensing[1–3]aswellastoultra-broadbandwirelessphotodiodetech
