简介：Fiber-opticFabry-Perot(F-P)sensorsarewidelyinvestigatedbecausetheyhaveseveraladvantagesoverconventionalsensors,suchasimmunitytoelectromagneticinterference,abilitytooperateunderbadenvironments,highsensitivityandthepotentialformultiplexing.Anewmethodtofabricatemicro-cavityFabry-Perotinterferometerisintroduced,whichisfusionsplicingasectionofconventionalsingle-modefiber(SMF)andasectionofhollowcoreorsolidcorephotoniccrystalfiber(PCF)togethertoformamicro-cavityatthesplicejoint.Thetechnologyoffusionsplicingisdiscussed,andtwominiatureopticalfibersensorsbasedonFabry-Perotinterferenceusingfusionsplicingarepresented.Thetwosensorsarecompletelymadeoffusedsilica,andhavegoodhigh-temperaturecapability.

简介：Ahigh-precisionwavelengthcontrollerispresentedinthispaper.ItisnecessarytofindoutthedifferencebetweenthecentralwavelengthofatunablefiberFabry-Perot(FFP)filterandthatoftheinputlaser,whilethewavelengthcontrol-leroperatesatthestatesofwavelength-scanningandwavelength-lockingmodes.Firstly,adynamicsimulationmodeloftunableFFPfilterisestablished,andthedynamiccharacteristicoftunableFFPfiltermodulatedbyanalternatingcurrent(AC)signalissimulated.Thenthemeasuringtimeatwavelength-scanningmodecomparedwiththetheorytimeisdiscussed,andthistimedifferenceshowsthedifferencebetweenthecentralwavelengthofatunableFFPfilterandthatoftheinputlaser.Atlast,theeffectsonwavelength-lockingprecisionoftimedelays,includingthetimedelayofopened-loopcircuit,thetimeconstantoftheclosed-loopcircuitandtheintrinsichysteresisofpiezoelectric(PZT)element,areanalyzed.AwavelengthcontrolleroftunableFFPfilterisdesignedandprepared.Theexperimentalresultsatwavelength-lockingmodeshowthatahighlockingprecisionisobtained.