Optical fiber manufacturing method

Abstract

To improve the operation rate of an optical fiber manufacturing apparatus by reducing a time required for a drawing speed increase process.SOLUTION: A method for manufacturing an optical fiber, capable of manufacturing the optical fiber by drawing an optical fiber preform heated in a heating furnace, comprises: the drawing speed increase step of increasing a drawing speed for drawing the optical fiber preform after hanging the optical fiber on the winding device of an apparatus for manufacturing the optical fiber to start winding; and the furnace temperature increase step of increasing the temperature of the heating furnace from the temperature of the heating furnace when hanging the optical fiber on the winding device of the apparatus for manufacturing the optical fiber to the temperature of the heating furnace when manufacturing the optical fiber used as a product in order to draw the optical fiber preform. The start timing of the furnace temperature increase step is before or the same as the start timing of the drawing increase step.SELECTED DRAWING: Figure 2

Claims

1. A method for manufacturing optical fibers, which involves drawing a fiber optic matrix heated in a heating furnace, The process involves first threading the optical fiber onto the winding device of the optical fiber manufacturing apparatus and starting the winding process, and then increasing the line speed at which the optical fiber base material is drawn, A furnace temperature rise step, which raises the temperature of the heating furnace from the temperature of the heating furnace when the optical fiber is threaded onto the winding device of the optical fiber manufacturing apparatus for drawing purposes to the temperature of the heating furnace when manufacturing the optical fiber to be used as a product, A feeder lowering step in which the feeder that feeds the optical fiber preform into the heating furnace is moved downward, It is equipped with, The start timing of the furnace temperature increase step is earlier than the start timing of the linear velocity increase step. A method for manufacturing optical fibers, wherein the start timing of the feeder descent step is later than the start timing of the furnace temperature rise step.

2. The method for manufacturing an optical fiber according to claim 1, wherein the movement speed of the feeder in the feeder descent step is 15 mm / min or more and 90 mm / min or less.

3. The method for manufacturing an optical fiber according to claim 1 or claim 2, wherein the amount of movement of the feeder in the feeder lowering step is 50 mm or more and 200 mm or less.

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