METHOD FOR PRODUCING GLASS PREFORM

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a glass preform capable of giving an optical fiber causing almost no transmission loss in good yield. SOLUTION: Glass microparticles are deposited on a starting material 2 to form a porous glass preform 4a. The porous glass preform 4a is introduced into a dehydration/sintering furnace 22 and heated by means of a resistance heater 21 to effect its dehydration and sintering to form a transparentized glass preform 4b. When the porous glass preform 4a is heated to effect its dehydration and sintering, an atmosphere gas having an H2O content of not higher than 1 vol ppb is used. COPYRIGHT: (C)2006,JPO&NCIPI