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AnalogTransmissionSystemsNoisecontributorsinananaloglinkCarrier-to-NoiseratioCarrier-to-NoiseratioExamplesofRINeffectsCNRversusopticalpowerlevelStandardFDMtechniqueNonlinearDeviceProvidedanumberMofsimultaneouslypresentsinusoidslyingbetween,thesecond-ordertermsatfrequenciesappear.Ingenerala1>>a2>>a3=>Itseemsthesecond-ordertermsaremoreharmfulthanthethirdterms.Ifwemakewillliecompletelyoutsidethebandtwo-tonethird-orderterms(becausethereareonlytwodistinctfrequencies)triple-beat(CTB)Define:Compositesecondorder(CSO)distortionCompositetriple-beat(CTB)distortionIngeneralCTBdistortionislargerthanCSOdistortion.IMproductsonther-thcarrierfor2fi-fjPredictedCSOfor60CATVchannelsPredictedCTBfor60CATVchannelsMultichannelFMRINversusopticalmodulationindexEffectsOfNonlinearityFig.9-11:Powerbudgetvsopticalmodulationindex4.3.2OpticalSinglesidebandModulation
