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1、AnalysisofAmplifierSpontaneousEmissionnoiseinRamanFiberAmplifiersb∗abHongZehua,Gaozhihui,YuAihua,HuangBichangabNormalcollege,ShenzhenUniversity,Shenzhen518060,ChinaCollegeofEngineeringandTechnology,ShenzhenUniversity,Shenzhen518060,China,E-mail:hongzehua1998@163.comABSTRACTIn
2、thispapertemperaturedependentmodelshavebeenproposedthataccuratelydescribeamplifiedspontaneousemissionindiscreteanddistributedRamanamplifiers.Usingthosemodelsweanalyzedafewmainfactorswhichinfluencetheamplifiedspontaneousemission(ASE)noise.Rayleighscatteringthatcanenlargethepow
3、erofASEnoiseistakenintoconsideration.Sowehavegotamoreaccurateresult.Keywords:Ramanfiberamplifier,ASEnoise,Rayleighscattering,channelgap1.INTRODUCTIONTheadventoftheopticalamplifierchangestheopticalfibercommunicationsystemsandinvitestherapiddevelopmentofwavelengthdivisionmultip
4、lexing(WDM)transmissionsystemsandnetworks.Providingflexiblebandwidthdesignandlownoise,theRamanamplifierhasbecomeanattractivesolutioninthehigh-capacitylong-haulwavelengthdivisionmultiplexingopticaltransmissionsystems.Althoughtheentirebandoferbium-dopedfiberamplifier(EDFA)ifful
5、lyutilized,theneedformoreopticalchannelsalonginstalledfibers,increasingchannelcountandopticalbandwidth,pushesEDFAtechnologybeyonditsperformancelimit[1-3].ToincreaseWDMdatacapacitiesandrealizetheultra-long-haulsystemreach,thenoiseperformanceofamplifiersbecomescritical[4-6].Sim
6、ilartootherAmplifiers,RamanFiberAmplifierswillleadtosomenoisewhiletheyamplifysignal.ThenoiseofRamanfiberamplifiers(FRA)mainlyincludesASEnoiseanddualRayleighscattering(DRS)noise.AmplifierSpontaneousEmission(ASE)noisethatduetotheamplifierofRamanspontaneousscatteringbypump(signa
7、l)isbackgroundnoisewhichoverlaywholeRamangainspectrum.ItisthemainnoisesourceofRamanFiberAmplifiers.SothestudyofASEnoiseisveryimportantfordecreasingnoiseandimprovingtheperformanceofsystem.FirstwegetthepowerequationsofASEnoisefromthepropagationequationsofFRA.Thenweanalyzedafewm
8、ainfactorswhichinfluencetheAmplifierspontaneousemission(ASE)noise.In
