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2152000Vol.21No.52000:1002-2082(2000)05-0013-06(,710100):(),:;;;;:TN25:A(n),()(MFD),1R[1]R=n2-1n2+2õMQ=4P3NAC(1)n;M;Q;NA;C,,,,;,[2],GeO2SiO2,B2O3SiO2,,122,,,,,,,-40+67,SiO2Dn110-5ö;Dn1.810-5ö;Dn0.910-5ö50Dn0.00032,:19990112:(1945),,,205,311GeCl4SiCl4õ30mlömin(48)ü30mlömin(52)2BBr3SiCl4õ30mlöminE50mlöminü80mlöminNA=0.2$n·1.510-2;$n110-3[3]34-60+850.000012ö,,Tg,,,31295nm41532nm3SiO2,1300nm,1.4675;1550nm1.46810.0006SiO2SiO2,Kc$-:Kc2Pan1vc2$-(2)vcLP11(2.405);n1SiO2(1.458);a(4Lm)Kc41$-5$-[4]0.5mös,125Lm5SiO2Kc$4(MFD)61295nm[5]6(1295nm)5(),,,5.17SiO2$RZ:7PCVDSiO2$RZ$=(nSiO2-nSiO2)önSiO2(3)SiO2öF0$1.0à,,;SiO2öGeO2$$0.8à,$$RZ($)=0.7$-0.7(kgömm2)(4),,0.000024ökpsi89,8(1295nm)10(a)4.1kgömm2SiO2SiO2519(1532nm)(50gÁ125Lm);10(b),[6],1110a,aSiO2SiO2;b,bGe;a,b,a,b5.211205(;)Brillouin,,,12[7]13$-[8]12.A$-0.3%B$-0.7%6113$-5.31550nm14151550nm()0.20dBökm0.22dBökmT200[9]GeO2SiO231550nm;SiO2121550nm2270K141.55LmT250;T200;T170;T110;T5066.1ARAR:AR=8P33K4n8p2BckBTf(5)nKpBckBTf151.55Lm$(à)ü1SiO2FSiO20.27($)õ2SiO2FSiO20.45($)$3GeO2SiO2SiO20.356.216LP01,EDR3[10]16LP01(V=2.405,K=1.25Lm,$=0.3à,R30.1dBökm)717(),:[1].()[M].:,1982.[2].[J].,1995,24(21):63-68.[3]CohenLG,etal.Effectoftemperatureontransmissioninlightguides[J].TheBellSystemTechnicalJournal,1979,58(4):945-951.[4]HanawaF,etal.Influencesofthedrawingconditionsonopticalcharacteristicsinundoped2silica2coresingle2modefibers[J],OpticsLett,1987,12(8):617-618.[5]WilliamsDH,etal.Single2modeopticalfiberindexofrefractiondependenceonproductparameters,tensilestressandtemperature[M].IWCS,1990,726-729.[6]YamauchiR,etal.Directobservationofdrawing2inducedanisotropicrefractive2indexchangeinquasifibersbyapolarizationpreformanalyzer[C],OFC89,1989,15:161.[7]HibinoY,etal.EvaluationofresidualstressandviscosityinSiO22coreöF2SiO2cladsingle2modeopticalfibersfromBrillouingainspectra[J].JAppl.Phys,1989,66(9):404924052.[8]OhgaY,etal.Influenceofdrawingconditionontherefractiveindexprofileandresidualstressinpuresilicacoresingle2modefibers[J].OpticalfiberCommunicationConference,1989,5:160.[9]BrehmC,etal.Improveddrawingconolitionsforverylow2loss1.55Lmdispersion2shiftedfiber[C],OFC88,1988.[10]SakaiJI,etal.Bendinglossofpropagationmodesinarbitraryindexprofileopticalfibers[J].ApplOpt,1978,17(10):1499-1506.DEPENDENTFACTOROFREFRACTIVEINDEXINFIBERESCAIChun2ping(XianInstituteofAppliedOptics,Xian710100China)Abstract:Thedependenceoftherefractiveindexofopticalfiberesoncomposition,temperature,warelength,MFDanddrawingtension(ordrawingtemperature)aswellasattenuationisdescribed.Thepapershowsthatduringopticalfiberdrawing,drawingtensionwouldbestrictlycontroledtoavoidtheindexchangeofopticalfiberesandincreasingattenuationduetoimproperdrawingtension.Keywords:opticalfiber;temperature;wavelength;MFD;drawingtension81