METHOD OF PRODUCING AN OPTICAL FIBER

摘要

A METHOD OF PRODUCING AN OPTICAL FIBER Disclosed is an improved method of producing an optical fiber with a low transmission loss for use in an optical communication system. The method comprises a chemical vapor deposition process wherein starting materials in gas phase are oxidized to form a soot on a glass substrate and, then, the soot deposited on the substrate is vitrified in an atmosphere of an inert gas which is easily dissolved in a glass. A preferable soot contains silicon dioxide, a first dopant for effecting an increase of the refraction index of the silicon dioxide and a second dopant for effecting a reduction of the vitrification temperature of the soot.