Design and characterization of microwave fiber-optic links

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1、DesignandCharacterizationofMicrowaveFiber•OpticLinks(InvitedPaper)StavrosIezekielDepartmentofElectricalandComputerEngineeringUniversityofCyprusNicosia,Cypruss.iezekiel@ieee.orgAbstract-Wereviewthedesignandcharacterizationissuesfiberisnot"ideal"andothersignal

2、degradationmechanismsinvolvedintheimplementationofanalogfiber-opticlinksforthesuchasdispersion,polarizationandcoherenceeffectsandtransmissionofmicrowavesignals.Recentlydevelopedtopologiesopticalnonlinearitiesmustbeconsidered.Forexample,formicrowavefiber-opti

3、clinksarediscussed.dispersionleadstoperiodicnullsintransmissionforlongenoughfibersorhighenoughfrequenciesunlessanopticalKeywords-microwavephotonics;analogfiber-opticlinks;single-sidebandmodulationschemeisemployed.microwavefiber-opticlinks.Althoughdiagramssuc

4、hasFig.1areusedbymanyauthorstodemonstratetheadvantageofopticalfiber,inordertomakeI.INTRODUCTIONavalidcomparisonwithmicrowavetransmissionlinesandOneofthefirstapplicationsinthefieldofmicrowavewaveguides,onemustbearinmindthatamicrowavesignalphotonicswasthetrans

5、missionofmicrowavesignalsovermustbeconvertedintotheopticaldomainandthenrecoveredsingle-modeopticalfiber[1]-[5].Therearetwokeyfromtheopticaldomain[4].Theresultingstructureisthenmotivationsforwishingtouseopticaltechniquestoconveytermedananalogmicrowavefiber-op

6、ticlink.(Hereanalogmicrowavesignals,namelyapotentialbandwidthofseveralmeansthatsmall-signaloperationisused,incontrasttolinksTHzaffordedbyusinganopticalcarrier,andthelowlossusedfordatatransmissioninwhichlarge-signalon-offkeyingcharacteristicsofsilicaopticalfi

7、ber[6].Thisisillustratedinschemesareoftenused.)Whenoneincludestheelectro-opticFig.l,whichcomparesthelossversusfrequencyofoptical(E/O)andoptoelectronic(OlE)conversionprocesses,anfiberagainstothermore"conventional"microwaveadditionalpenaltyofbetween20dBand40dB

8、(ofelectricaltransmissionmedia.Theflatattenuationprofileisaresultofattenuation)isoftenaddedtothelossesduetofiber(Fig.2).thefactthata100GHzbandwidthrepresentsverynarrowbandmodulationofa1.55urnopt