| 摘要 |
The present invention provides a method for manufacturing an optical fiber comprising the steps of forming a glass body containing a core, preparing a glass tube which will form a cladding portion, inserting the glass body into the glass tube, and collapsing the glass tube with the glass body by heating, wherein the method comprises a step of processing the glass tube such that it has at least one end tapered to which a pull is to be applied. The method may further comprise the steps of cleaning the outer surface of the glass tube, choosing the outer diameter of the glass body and the inner diameter of the glass tube such that the difference between the two diameters is not lower than 1.0 mm but not higher than 10.0 mm, choosing the inner diameter of a supporting tube attached to an inert end (opposite to the pulled end) of the glass tube such that it is equal to or higher than the diameter of the glass tube, with respect to the drawn end of the glass tube, processing the end such that its inner surface has a taper and the tapered end is sealed, and providing a spacer to the glass assembly such that the interval between the outer surface of the glass body and the inner surface of the glass tube exhibits a practically uniform profile over the full length of the glass assembly.
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