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分布反馈光纤激光器弯曲特性的实验研究(英文).docx

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分布反馈光纤激光器弯曲特性的实验研究(英文) ExperimentalStudyontheBendCharacteristicsofDistributedFeedbackFiberLaser Abstract: Distributedfeedbackfiberlasers(DFBFLs)areimportantsourcesoflightusedinvariousapplications,suchastelecommunication,sensingandmedical.ThebendcharacteristicofDFBFLsisacrucialconsiderationinpracticalapplications.Therefore,thisstudywasaimedatexperimentallyinvestigatingthebendcharacteristicsofDFBFLs.Theresultsshowthatthebendcharacteristicisaffectedbythebendradius,thebenddirection,andthecouplingcoefficient.ThefindingsoftheexperimentareexpectedtoprovideusefulguidanceforthedesigningandoptimizationofDFBFLs. Introduction: Distributedfeedbackfiberlasers(DFBFLs)areatypeoffiberlaserthatutilizesthedistributedBragggratings(DBRs)toprovideopticalfeedback.DFBFLshavemanyadvantages,suchaswidetunability,highspectralpurity,andhighefficiency,makingthemidealsourcesoflightformanyapplications,includingsensing,telecommunications,andmedicalapplications. DFBFLsareusuallymadebyinscribingperiodicperturbationsintothecoreofasingle-modeopticalfiber.Theperturbationscreateagratingstructurethatwillprovideopticalfeedbackbyreflectingaportionoftheoutputlightbackintothefiber. ThebendcharacteristicofDFBFLsisacrucialconsiderationinpracticalapplications.Thebendcharacteristicisaffectedbythebendradius,thebenddirection,andthecouplingcoefficient.Therefore,thisstudywasaimedatexperimentallyinvestigatingthebendcharacteristicsofDFBFLs. ExperimentalSetup: TheexperimentalsetupusedinthisstudyisshowninFig.1.TheDFBFLwasacommercialdevicewithacenterwavelengthof1550nm.TheDFBFLwasconnectedtoapolarization-maintainingfibercoupler,whichwasusedtomeasuretheoutputpoweroftheDFBFL.Thebendradiusofthefiberwasvariedbywrappingthefiberaroundaglassrodwithadiameterof10mm. Thebenddirectionwascontrolledbychangingthepositionofthefiberwithrespecttotheglassrod.ThecouplingcoefficientwasadjustedbychangingthelengthoftheDFBFL. Results: TheoutputpoweroftheDFBFLwasmeasuredfordifferentbendradii,benddirections,andcouplingcoefficients.Theresultsaresho