DRAWING METHOD OF OPTICAL FIBER PERFORM, DRAWING DEVICE THEREFOR, AND OPTICAL FIBER PERFORM

摘要

PROBLEM TO BE SOLVED: To provide a drawing method of an optical fiber preform in which the optical fiber preform can be efficiently fused to a take-over bar with a high quality. ;SOLUTION: This drawing method of optical fiber comprises approaching an optical fiber preform 11 consisting of a core 12 and a clad layer 13 and a take-over for into a heated furnace core tube from above and under, respectively, to fuse the lower end surface of the optical fiber preform 11 to the upper end surface of the take-over bar, then lowering the optical fiber proform 11 and the take-over bar at respectively prescribed speeds, and successively narrowing the lower end of the optical fiber preform 11 to form a glass rod 14. In this method, after the upper end surface of the take-over bar A is fused to the lower end surface of the optical fiber preform 11, the take-over bar A is separated therefrom and removed, another take-over bar B is then raised to fuse its upper end surface to the lower end surface of the optical fiber preform 11, and the optical fiber preform 11 and the take-over bar B are thereafter lowered at respectively prescribed speed, whereby the lower end part of the optical fiber preform 11 is successively narrowed to form the glass rod 14.;COPYRIGHT: (C)1999,JPO