光纤参量放大器的带宽拓展研究

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1、西南交通大学硕士学位论文光纤参量放大器的带宽拓展研究姓名：李建平申请学位级别：硕士专业：通信与信息系统指导教师：罗斌20070501西南交通大学硕士研究生学位论文第1I页AbstractAllfiber-optictransmissionsystemsneedopticalamplifierstocompensateforfiberloss．Fiberopticalparametricamplifier(FOPA)isanewkindofopticalamplifierwhichrelyingmlfour-wavemixing(FwM)ha

2、sreceivedincreasedattentionlatelyduetotheirpotentialsforapplicationsassignalamplifiers，wavelengthconverters，andali-opticalsignalprocessors．Currently,FOPA伽bedesignedwithconventionaldispersionshiftedfiber(DsF)andhighlynonlineardispersion—shiftedfiber(HNL-DSF)．Ithassmallampli

3、fiedbandwidthwhentheFOPAisdesignedwithDSEInordertobroadenitsamplificationbandwidth,acascadeconfigurationwithperiodicdispersioncompensationcomposedofconventionalDSFandsinglemodefiber(sMF)isusedinthispaper．ThentheFOPAisstudiedasfollows：Firstly,combiningthefour-wave-mixingcou

4、plingequations,theexpressionofoutputpower,phaseandgainofthesignalandidlerfortheDSF+SMFdualpumpFOPAarederivedwhenconsideringthedifferentboundarycondition．Meanwhile,thephase-matchingmethodwhichusingthepositivesecond-orderdispersionofSMFtocompensatethephase·mismatchcausedbyth

5、enegativefourth-orderdispersionofDSFispresented．AndtheoptimalSMFlengthisobtained．Theamplifiedbandwidthdesignedbythislengthcanbeefficientlybroadened．Secondly,usingthefour-wave-mixingpowercouplingequations,theDSF+SMFdualpumpFOPAissimulated．Theresultsshow,fora血edDSFlength,con

6、sistingoftwoequalsegments,andusingtheoptimalSMFlengthtocompensatethedispersioncanefficientlybroadentheamplificationbandwidth．Itfurthershowsthatalargerbandwidthcanbeobtainedbyusingmulti-segmentscompensationforthesameDSFlength．Other,longerDSFlength,largerpumppowercanobtainla

7、rgerband谢dthandgajn．Atthe商也thetheoreticalandsimulatedpropertiesarccompared，andthecomparedresultshowsthevalidityofthederivedexpressions．geywords：FOPA；four-wave-mixing；gainbandwidth；dispersioncompensation西南交通大学硕士研究生学位论文第1页第一章光纤参量放大器的研究概述1．1引言在长距离光通信系统中，光放大器变得必不可少。目前，光放大器主要有以

8、下几种【1l：半导体光放大器(soA)、掺铒光纤放大器(EDFA)、拉曼光纤放大器㈣和光纤参量放大器(FOPA)。半导体光放大器是利用半导体中电子和空穴辐射复合产生光予从而对入射