Method of manufacturing optical fibre preforms
    21.
    发明授权
    Method of manufacturing optical fibre preforms 失效
    光纤预制棒的制造方法

    公开(公告)号:US4165224A

    公开(公告)日:1979-08-21

    申请号:US888050

    申请日:1978-03-17

    摘要: In the manufacture of silica optical fibers a tube having an internal coating of a volatile dopant is locally heated by a hot zone repeatedly traversed along its length to promote shrinkage and finally collapse of the tube bore. During the shrinkage prior to the final collapse traversal a gas flow of oxygen and a halide of the volatile dopant is maintained through the tube in order firstly to provide a small overpressure to ensure circularity in the shrinkage and secondly to compensate for the tendency for dopant to be lost by volatilization.

    摘要翻译: 在二氧化硅光纤的制造中,具有挥发性掺杂剂的内部涂层的管通过沿其长度重复穿过的热区域局部加热,以促进管孔的收缩并最终塌缩。 在最终塌缩过程之前的收缩期间,通过管保持氧气和挥发性掺杂剂的卤化物的气流,以便首先提供小的过压以确保收缩的圆形度,其次补偿掺杂剂的倾向 被挥发失去。