Patent Number: 6,612,134

Title: Method of curing coated optical fibers

Abstract: The present invention relates to a method of making an optical fiber product. In particular, this manufacturing method is characterized in that, between a drawing step in which a coated optical fiber comprising a glass fiber and a primary coating layer disposed around the outer periphery of the glass fiber is wound around a reel and a processing step in which the coated optical fiber wound around the reel is rewound around a bobbin, a control step is provided for holding the coated optical fiber wound around the reel in a place with a mean atmospheric temperature T (>0.degree. C.) for at least 30,000/T.sup.2 (hr) and, in the case where a coloring layer or the like is disposed around the outer periphery of the coated optical fiber, for at least 30,000/T.sup.2 (hr) but not longer than 210,000/T.sup.2 (hr). The optical fiber product such as a ribbon-type optical fiber obtained in consequence of this control step, effectively suppressed are increase in transmission loss caused by delamination between the glass fiber and the primary coating layer disposed around its outer periphery, and delamination of the coloring layer disposed around the outer periphery of the coated optical fiber or the like.

Inventors: Shimoda; Koji (Yokohama, JP), Aikawa; Haruhiko (Yokohama, JP), Yoshida; Motohide (Yokohama, JP), Hasegawa; Takashi (Yokohama, JP)

Assignee: Sumitomo Electric Industries, Ltd.

International Classification: C03C 23/00 (20060101); C03C 25/12 (20060101); C03C 25/10 (20060101); C03B 037/018 ()

Expiration Date: 09/02/2020