Method for producing glass preform for optical fiber

摘要

A method for producing a glass preform for an optical fiber by means at least two burners, comprising jetting a glass raw material containing SiCl4 from the first center burner and a hydrogen-containing silicon compound with larger reaction heat than SiCl4 from at least one second burner, flame hydrolyzing the glas raw material to synthesizing fine glass particles, depositing the fine glass particles on a starting member to form a porous soot preform and heating and sintering the soot preform to obtain a transparent glass preform, by which a large preform is stably produced and a bulk density of the preform is easily controlled.