METHOD AND APPARATUS FOR MANUFACTURING OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To provide a method and apparatus for manufacturing an optical fiber, capable of detecting an abnormal point almost without omission.SOLUTION: The apparatus for manufacturing an optical fiber, capable of manufacturing the optical fiber by heating and drawing a glass preform for optical fibers in a drawing furnace comprises: a comparison determination part 23a of a bubble sensor signal for determining a point detected by the bubble sensor to be an abnormal point of the optical fiber; and a first comparison determination part 23c for determining a point exceeding a first threshold value to be the abnormal point of the optical fiber by comparing a signal (selection data) having a frequency higher than a predetermined frequency with the first threshold value from the measured data of the glass outer diameter of the drawn optical fiber.SELECTED DRAWING: Figure 2