SETT ATT FRAMSTELLA STAVFORMAT GRUNDMATERIAL FOR OPTISKA FIBRER

摘要

There is described a method of producing a rod-shaped base material for an optical transmission fiber which has the steps of advantageously measuring the refractive index distribution of the transparent glass rod obtained. The method contemplates heating and sintering the glass soot unit before the step of covering quartz glass material onto the transparent glass rod and removing the outer peripheral part of the transparent glass rod in which the value of the refractive index is largely displaced from a reference in a predetermined range. The rod-shaped base material thus produced exhibits very wide band width transmission characteristics.