METHOD FOR MANUFACTURING OPTICAL FIBERS

摘要

This method for manufacturing optical fibers comprises: a preparation step for preparing a glass preform, which has multiple holes extending along the longitudinal axis, and for which the ratio between the diameter of the holes and the outer diameter of the glass preform is defined as a first ratio; and a drawing step for heating and melting one end of the glass preform while applying pressure inside the multiple holes of the glass preform, and drawing an optical fiber having multiple holes extending along the longitudinal axis. If the ratio between the diameter of at least one the holes in the optical fiber and the outer diameter of the optical fiber is defined as a second ratio, the optical fiber is drawn after adjusting the pressure inside at least one hole in the glass preform in such a manner that the ratio between the second ratio and the first ratio decreases to less than 1.0. Manufacturing costs can thus be reduced.