| 摘要 |
PURPOSE:To provide a process and apparatus for the production of an optical fiber capable of facilitating the control of fiber diameter and drawing speed in the drawing of a large-sized optical fiber preform and remarkably shortening the time necessary for increasing the drawing speed. CONSTITUTION:An optical fiber preform 11 is heated and melted in a drawing furnace 12 having a heater, a coating layer is applied to the surface of the drawn optical fiber 13 and the fiber is wound. The optical fiber production apparatus having the above function is provided with a 1st outer diameter gauge 14 to measure the outer diameter of the drawn optical fiber 11 and control the drawing speed according to the measured diameter and with a 2nd outer diameter gauge 21 placed upstream of the 1st gauge and measuring the outer diameter of the drawn optical fiber before the drawing speed of the optical fiber 13 reaches a prescribed drawing speed (>=100m/min). |
