Method for fabricating optical fiber preform witho

专利名称：Method for fabricating optical fiber preform

without hydroxyl group in core

发明人：Chan-Joo Lee,Lae-Hyuk Park,Jae-Sun

Kim,Soon-Il Son

申请号：US10489436申请日：20040309

公开号：US20040261461A1公开日：20041230

专利附图：

摘要：Method for fabricating an optical fiber preform substantially without hydroxylgroup in core includes forming clad layer having relatively low refractive index by

depositing soot (SiO, GeO) to inner surface of quartz tube; and forming core layer havingrelatively high refractive index on clad layer, which includes (a) a base core layer formingstep composed of generating soot by heating inside of quartz tube to 1000° C.-1400° C.with introducing reaction gases (SiClGeCl) into quartz tube, accumulating soot on cladlayer removing hydroxyl-groups (OH) and moisture from soot and tube by heating insideof quartz tube to 600° C.-1200° C. with introducing dehydration gases (He, Cl; O) intoquartz tube, and sintering and vitrifying soot by heating quartz tube inside over 1700° C.with introducing dehydration gas (He, Cl, O); and (b) a step of forming at least oneadditional core layer on base core layer by repeating the

accumulating/dehydrating/sintering of the step (a) at least one time.

申请人：LEE CHAN-JOO,PARK LAE-HYUK,KIM JAE-SUN,SON SOON-IL

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