| 摘要 |
PURPOSE:To obtain a long sized, single mode glass fiber easily by a method wherein a process of manufacture that a preform rod is inserted into a glass tube and heated and elongated is repeated, the rod is brought to the ratio of the outer diameters of the desired core to a clad and a wire is drawn. CONSTITUTION:A preform rod 1 having a core forming portion and a clad layer forming portion is covered with a glass tube 2, let pass through a heating furnace 3 and heated and elongated. The preform rod 1 with the ratio of the outer diameters with the desired core is made up by repeating this process of manufacture several times. A single mode glass fiber is built up in such a manner that the preform rod is heated, melted and a wire is drawn. According to this method, a diameter of the core and a clad layer can be enlarged. |
