Patent ID: 8744226
Filing Date: 2014-06-03
Classification: C03C,G02B

Abstract:
1. A method of manufacturing an optical fiber, which is a method of manufacturing an optical fiber having a fiber coating on the outer circumference of a glass fiber, comprising: a first step of drawing an optical fiber preform into a glass fiber and disposing a fiber coating on the outer circumference of the glass fiber to form a parent optical fiber; a second step of cutting the parent optical fiber into a plurality of individual optical fibers; a third step of determining, at, at least, one spot of the parent optical fiber, a failure strength F1, which is a tension at which the parent optical fiber fails when the tension of the parent optical fiber is increased at a tensile testing speed of 1%/min, and a failure time T, which is a period of time until the parent optical fiber wound on a mandrel with a radius of 1.3 mm fails; a fourth step of determining a failure strength F2 of each of the plurality of individual optical fibers; and a fifth step of selecting an optical fiber having a failure strength F2 of 5.5 kgf or more from the individual optical fibers cut from the parent optical fiber whose failure strength F1 [kgf] and failure time T [min] satisfy the inequality T>2.6×10