| 摘要 |
<p>Disclosed is a method for producing a glass preform which is suitable for the production of an optical fiber that is reduced in transmission loss in the 1.38 µm wavelength band. Specifically disclosed is a method for producing a glass preform, wherein a glass preform is produced via an affixation step, a deposition step, a drawing step, a transparentization step and a core solidification step, said steps being sequentially carried out. In the transparentization step, a glass fine particle deposit (13) is introduced into a heating furnace (22), into which an He gas and a Cl2 gas are introduced, together with a tubular handle (12), which is integrated with the glass fine particle deposit (13), and heated by a heater (23), thereby producing a transparent glass tube material (14). Right after the production of the transparent glass tube material (14), a dry gas is introduced into the heating furnace (22), and the transparent glass tube material (14) is cooled, while controlling the humidity in the ambient atmosphere of the transparent glass tube material (14) to 0.1% or less.</p> |
