Core glass for an optical fibre preform, a preform produced using the core glass and processes for producing the core glass and an optical fibre

摘要

Core glass is obtained by flame hydrolysis of a silicon compound, depositing finely ground silicon dioxide on a substrate with direct vitrification, and forming a synthetic quartz glass. The quartz glass has a hydrogen content of less than 1 x 10<18> molecules/cm<3>.