| 摘要 |
PURPOSE:To decrease the number of production apparatuses, shorten the production time, and manufacture an optical fiber at a high speed, by carrying out the vitrification and the drawing of an optical fiber simultaneously. CONSTITUTION:A porous preform attached to the seed rod 3 is inserted into the electric furnace 1 acting also as a drawing furnace, and is vitrified to a transparent glass 6 by introducing an inert gas into the furnace through the gas inlet. The preform is drawn to an optical fiber simultaneous to the vitrification process 6. The temperature distribution in the drawing zone is maintained at about 1,900-2,000 deg.C. An optical fiber can be manufactured economically at a high speed by this process. |
