Linearization of Phase-Modulated Analog Optical Links Employing Interferometric Demodulation

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1、1212JOURNALOFLIGHTWAVETECHNOLOGY,VOL.27,NO.9,MAY1,2009LinearizationofPhase-ModulatedAnalogOpticalLinksEmployingInterferometricDemodulationJasonD.McKinney,Member,IEEE,KristinaColladay,Member,IEEE,andKeithJ.Williams,Member,IEEEAbstract—Wepresentalinearizedphase-modulatedanalogpho-Conceptually

2、,onecanapplysimilarlinearizationtechniquestoniclinkthatutilizesparallelinterferometricdemodulationtoforphase-modulatedanaloglinkstothoseappliedinin-suppressthethird-orderintermodulationdistortionpresentinthetensity-modulateddirect-detection(IMDD)links.Veryrecentlylink.Byutilizingtwoparallel

3、interferometerswithdifferentdiffer-infact,thepolarization-dependentnatureofLiNbOmodula-entialdelays,weareabletobalancethethird-orderdistortionintheoutputphotocurrentandachieveafifth-orderlimitedlinkre-torspreviouslyappliedforlinearizationofIMDDlinks[9]hassponse.Wedemonstrateshotnoise-limited

4、spurious-freedynamicbeendemonstratedtosuppressthethird-orderintermodulationrangesofdB(1-Hzbandwidth)atGHzforatotaldistortioninacoherentanaloglink[13].IncontrasttoDCphotocurrentmAanddB(1-Hzbandwidth)thistechnique,whichsuppressesthethird-orderintermodula-atGHzforatotalDCphotocurrent

5、mA.Thesetiondistortionintheopticaldomain,onecouldenvisionre-resultsrepresentanearlytwoorder-of-magnitudeimprovementindynamicrangeoverconventionalintensity-orphase-modulatedmovingintermodulationcomponentsintheelectricaldomainanalogphotoniclinksforafixedreceivedphotocurrent.usingatechniquesimi

6、lartothatshownin[10]forIMDDlinks.WehaverecentlydemonstratedalinearizedanaloglinkthatIndexTerms—Analogphotoniclinks,linearization,microwavephotonics,phasemodulation.exploitstheRFresponseofopticalinterferometricdemodula-tiontoachievelinearization[14].Thistechniqueexploitssimilarconceptstothos

7、edemonstratedin[9],[10],and[13];however,I.INTRODUCTIONlinearizationisachievedatthedemodulator(receiverend)ofthelink.ThisgreatlysimplifiesthelinkarchitecturebymovingthecomplexityofthelinearizationproblemtothereceiveendoftheHEuseofphotoniclinksinradio-frequ