| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical fiber capable of manufacturing a high-quality optical fiber by suppressing excellently fluctuation of a cut-off wavelength. <P>SOLUTION: This method includes: a cut-off wavelength prediction processing of predicting longitudinal direction fluctuation of the cut-off wavelength based on a refractive index distribution in the longitudinal direction of an optical fiber preform 2 which is measured beforehand; a target post-coating tension determination processing of determining a target post-coating tension so that the cut-off wavelength of a drawn glass fiber 3 becomes constant in the longitudinal direction based on a relation between drawing tension and the cut-off wavelength and on a relation between the drawing tension and tension after coating; and a furnace temperature control processing of controlling a furnace temperature of a drawing furnace 12 so that the post-coating tension agrees with the target post-coating tension, wherein, when performing the target post-coating tension determination processing, a target post-coating tension correction processing of correcting the target post-coating tension is performed based on fluctuation of take-up resistance of the optical fiber 4. <P>COPYRIGHT: (C)2013,JPO&INPIT |
