| 摘要 |
In the present invention an optical fiber is manufactured by drawing a wire by going through the following steps: an optical fiber characteristic prediction step for measuring, in at least two locations in the longitudinal direction, the diffraction rate distribution of the cross-sectional radial direction of an optical fiber base material prior to wire drawing, and calculating and predicting at least two optical fiber characteristics of the longitudinal direction on the basis of the measured diffraction rate distribution; a sample fiber characteristic measurement step for collecting sample fibers from the wire drawing start-end or the wire drawing start-end and a point along the wire drawing, and measuring at least two optical fiber characteristics of the collected sample fibers; an optical fiber characteristic correction step for correcting fluctuations in the longitudinal direction of the at least two optical fiber characteristics calculated in the optical fiber characteristic prediction step, on the basis of the optical fiber characteristics of the sample fibers measured in the sample fiber characteristic measurement step; and a wire drawing tension adjustment step for determining wire drawing tension so that the at least two optical fiber characteristics subsequent to the sample fiber collection positions are all within a favorable range in the longitudinal direction, and for adjusting the wire drawing tension. |
