PRODUCTION OF OPTICAL FIBER BACE MATERIAL

• Main Authors: KAMIYA KAZUO, OKI KIYOTAKA, YOKOGAWA KIYOSHI, SHIOMOTO KOICHI
• Format: Patent
• Language: English
• Published: 29.01.1990
• Subjects: CHEMISTRY; GLASS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

PURPOSE:To stably produce the optical fiber of a graded index type having an excellent transmission characteristic by growing a porous glass material by using gaseous glass raw materials which consist of silicon tetrachloride and dopant and are corrected in change rate. CONSTITUTION:The gaseous glass raw materials which consist of the silicon tetrachloride and the dopant and are regulated in quantity are introduced to an oxyhydrogen flame burner and is subjected to a flame hydrolysis. The formed fine glass particles are deposited on a rotating base material. This base material is then pulled up, by which a porous glass body is grown thereon in the axial direction thereof. The quantity of the gaseous raw materials regulated in the method of producing the optical fiber base material by nitrifying the above- mentioned porous glass material to transparent glass is specified to the value corrected of the change rate by the atm. pressure. The correction of the quantity of the gaseous raw materials to be supplied may be executed by determining the change in the evaporation rate of the silicon tetrachloride and germanium tetrachloride as the dopant with the fluctuation in, for example, the atm. pressure, from the figure, then by determining the correction rate of the carrier gas to correct this change rate from the figure.