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1、JQRGENSENetal.:TWO-SECTIONSEMICONDUCTOROPTICALAMPLIFIER351[7]B.Fernieretal.,“DesignandrealizationofpolarisationinsensitiveIntegratedOpt.OpticalFiberCommun.,Kobe,Japan,paper19C2-semiconductoropticalamplifierswithlowforwardcurrent,”inDig.3,July1989.Opt.Arnpl.Appl.,Monterey,CA,paperME3,Aug.1990
2、.[9]W.B.JoyceandR.W.Dixon,“Analyticalapproximationsforthe[8]G.Eisensteinelal.,“AmultiplequantumwellopticalFermienergyofanidealFermigas,”Appl.Phys.Lett.,vol.31,amplifier/modulatorintegratedwithatunableDBRlaser,”inDig.pp.354-356,1977.GainandNoisePenaltyforDetuned980-nmPumpingofErbium-DopedFibe
3、rPowerAmplifiersB.Pedersen,J.Chirravuri,andW.J.MiniscalcoAbstract-Theimpactofalteringthefiberlengthandpumppumpwindowaround980nmcanbeobtainedforpowerwavelengthonthegainandnoiseperformanceoferbium-dopedamplifiersbyappropriatechoiceoffiberlengthanddesign,fiberpoweramplifierspumpedinthe980-nmban
4、disexamined.albeitwithadegradationofnoisefigure.Againpenaltyofc0.5dBwasexperimentallyobservedovera18-nmpumpwavelengthrange.TheoreticalanalysisindicatesEXPERIMENTALthatincreasingtheNAfrom0.15to0.25significantlyimprovesthetoleranceforagivengainpenaltybuthaslittleeffectuponTheexperimentalsetuph
5、asbeendescribedin[3].Anoisefigure.Foragivenfiberlength,thenoisefigureincreasesTi:sapphirelaserprovidedcodirectionalpumpingatwave-by0.1dBforeach3nmthepumpwavelengthdeviatesfrom979lengthsrangingfrom960tolo00nm.Thepumpand1551-nmnm.signalwerecombinedbyaWDMfiber-coupler,andthepumppowerlaunchedint
6、othedopedfiberwasmonitoredforINTRODUCTIONeachpumpwavelengthintheexperiment.Fig.1displaysthesignaloutputpowerasafunctionofHEveryefficient[11-[3]butrelativelynarrow980-nmTabsorptionbandoferbium(FWHM=16nmforAl/ErpumpwavelengthforaGe/Al/P/Er-dopedsilicafiberwithanNAof0.18andacutoffwavelengthof94
7、0nm.Thesignaland=11nmforGe/Ersilica)posesaseriousproblemforthemanufacturersofsemiconductorpumpsourcesforer-launchedintotheerbium-dopedfiberwas-1.4dBm.Thebium-dopedfiberamplifiers(EDFA’s).Thelowyieldforexperimentalresultsareindicatedbymarksforthreed
