| 摘要 |
PURPOSE:To prevent OH from entering the interior of glass for a core and contrive reduction in OH loss, by forming a glass layer for the first clad of a prescribed thickness on a glass rod to be a core of an optical fiber and dividedly forming the residual glass layer for a clad plural times. CONSTITUTION:The first SiO2 fine glass particle layer for a clad is initially formed on a glass rod for a core consisting of pure quartz glass by an outside vapor deposition so as to provide about 1/4-1/2 thickness based on the diameter of the above-mentioned rod and then transparently vitrified in a heating furnace. Furthermore, at this time, a gas, such as CF4, as necessary, is passed through the heating furnace to add F into the glass. Fine SiO2 glass particles are then similarly and dividedly deposited plural times on the rod by the outside vapor deposition and transparently vitrified to form the residual glass layer for the clad. |
