1978 Narrow-band Bragg reflectors in optical fibers

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1、66OPTICSLETTERS/Vol.3,No.2/August1978Narrow-bandBraggreflectorsinopticalfibersB.S.Kawasaki,K.0.Hill,D.C.Johnson,andY.FujiiCommunicationsResearchCentre,DepartmentofCommunications,Ottawa,Ontario,CanadaK2H8S2ReceivedApril11,1978Theformationandcharacterizationofnarrow-band-waveguidereflectionfi

2、ltersinGe-dopedsilicaopticalfibersisdescribed.Thefilterscanhavecomplexresponseprofilesandaretunableinfrequencybymechanicalstrain.Theobservationofphotosensitivityinthecoreregiontothefiber.TheinputendofthefiberisclampedinofGe-dopedsilicaopticalfiberswasrecentlyreported,'thefusedquartzjawsofav

3、iselikemountthatcanbeandthiseffectwasusedtoproducenarrow-band-accuratelypositionedpiezoelectricallytopermitprecisewaveguidereflectionfiltersfortheconstructionofacouplingoftheargonbeamtothefiber.Thefarendofdistributed-feedbackgaslaser.Thefiltersareappar-thefiberisclampedinjawsattachedtoasect

4、ionofentlypermanentlyinducedinthefibers,andwehavespringsteel,whichservestoapplythedesiredamountobservednosignificantdecayordegradationoftheoflongitudinalstress.Thespringalsoservestoreducedevicesoverperiodsofseveraldays.thedetuningeffectsofvibrationsthatmayproduceInthisLetter,wedescribeindet

5、ailtheexperimentalrelativemotionbetweenthetwoendmounts.Thetechniquesusedtoproduceandcharacterizethesemotionistranslatedintospringflexureratherthanhigh-spectralresolutiondevices.Themeasurementofchangesintensiononthefiber,aswouldoccurwithanthefiltercharacteristicsshowsthatthefilterscanbeinfle

6、xiblemount.Thequartztubesurroundingthemadeextremelynarrowband(<200MHz).Thisresultfibershieldsitfromthermaleffectsthatwouldbein-isexpected,sincethefiltersareformedoverlonglengthsducedbyaircurrentsaroundthefiber.Shieldingoffiberandareaccuratelycharacterizedaslength-againstthermaleffectsandthe

7、minimizationoftensionlimitedBraggdistributed-feedbackwaveguidefilters.changesisnecessaryintheexperimentbecausetheMoreover,thesedevicescanbemadewithmultiplere-growthofthefiltersissensitivetobothofthesepa-jectionbands.Anattractivefeatureofthesestructuresra