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基于光纤拉锥及相位调制的可切换多波长掺铒光纤激光器(英文).docx

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基于光纤拉锥及相位调制的可切换多波长掺铒光纤激光器(英文) Introduction: Erbium-dopedfiberlasers(EDFLs)havebeenwidelyusedinopticalcommunication,sensing,andbiomedicalapplications.Inrecentyears,thedevelopmentofmulti-wavelengtherbium-dopedfiberlasershasattractedconsiderableattentionowingtotheirpotentialapplicationinwavelengthdivisionmultiplexing(WDM)systems,sensingnetworks,andspectroscopy.Inthispaper,wepresentatunablemulti-wavelengtherbium-dopedfiberlaserbasedontaperingfiberalongwithphasemodulation. Workingprinciple: Theproposedmulti-wavelengtherbium-dopedfiberlaser(MWEDFL)consistsofanerbium-dopedfiber(EDF)asthegainmedium,anopticalcirculator,a3dBcoupler,apolarizationcontroller,aphasemodulator,andamulti-wavelengthfilter.TheopticalcirculatorisusedtoseparatetheoutputfromtheinputsignalintheEDF.The3dBcouplerisusedforsplittingtheoutputofEDFintotwoequalpowersignals.Oneofthesignalsissenttothephasemodulatorandisusedtointroducephase-shiftinthesignal.Theothersignalisusedasthereferencesignalwhichisreceivedbythemulti-wavelengthfilter. ThephasemodulatorismadeofaLiNbO3crystalwhichisdrivenbyanRFsignaltocreatephase-shiftinthesignal.Thephase-shiftcreatedbythephasemodulatoriscontrolledbytheRFmodulationfrequency.Thereferencesignalfromthe3dBcouplerissenttothemulti-wavelengthfilterwhichisusedtoselecttheoutputwavelengthsoftheMWEDFL. Themulti-wavelengthfilterusedintheproposedMWEDFLisaFabry-Perotetalonwhichisdesignedtohaveapeaktransmissionataspecificwavelength.Thewavelengthselectionoftheetalonisachievedbyadjustingthespacingbetweenthetwomirrorsoftheetalon. TheproposedMWEDFLisbasedontheconceptofcascadeofcombfilterswherephase-shiftedsignalsarecreatedatspecificfrequencies.Byselectingthefrequencyofthephasemodulatedsignal,specificwavelengthsoftheEDFoutputareselected.Thewavelengthselectedoutputisthenpassedthroughtheetalonwhichactsasabandpassfiltertoselecttherequiredwavelength. Experimentalresults: TheproposedMWEDFLwasfabricatedbyusingaconventionalerbium-dopedfiber,phasemodulator,andanetalon.TheoutputcharacteristicsoftheMWEDFLwer