PROCESS AND APPARATUS FOR DRAWING A PREFORM AND FOR DRAWING AN OPTICAL FIBRE FROM THE DRAWN PREFORM

摘要

PURPOSE: The present invention relates to an optical fiber manufacture method, a preform manufacture method and a preform manufacture apparatus that can manufacture a preform and an optical fiber with reduced variation in their diameters. CONSTITUTION: A method for manufacturing an optical fiber preform (107) and a fiber(350) therefrom has setting a heating condition for heating a glass rod (106), which is a pa rent material of the optical fiber (350), and an elongating speed of the glass rod based on a prescribed numerical value which changes with a progress of elongation of the glass rod; heating and elongating the glass rod to generate a preform (107) based on the heating condition and the elongating speed which are set by the setting; and drawing the preform to an elongated glass rod preform and drawing the elongated glass rod preform to a filament-like form by further heating the preform to generate the optical fiber.