| 摘要 |
PURPOSE:To obtain a device for producing an optical fiber preform capable of easily controlling the flow in a reaction vessel, the temp. of the preform surface and the position of a flame. CONSTITUTION:A raw gas is introduced into the oxyhydrogen flame in a reaction vessel 1 to form a glass fine particle, and the fine particle is deposited on a seed rod 2 as the target and grown to produce an optical fiber preform 4. In this case, the volume in the vessel 1 is increased as the preform is grown in volume. Accordingly, the raw gas flow in the vessel is stabilized, the preform surface temp. is stabilized, and the core flame, clad flame, the particle flow in the core flame and clad flame and the flames are not displaced. |
