Method of manufacturing optical fibre preforms
    253.
    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

    Abstract: 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.

    Abstract translation: 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。

    Method of drawing glass optical waveguides
    254.
    发明授权
    Method of drawing glass optical waveguides 失效
    绘制玻璃光波导的方法

    公开(公告)号:US4157906A

    公开(公告)日:1979-06-12

    申请号:US879154

    申请日:1978-02-21

    Applicant: Alan C. Bailey

    Inventor: Alan C. Bailey

    Abstract: A method of making glass optical waveguides by the flame hydrolysis technique. Particles of glass soot produced by flame hydrolysis are deposited on the outside surface of a mandrel to form a porous preform. The soot particles closer to the mandrel have a refractive index greater than that of the soot disposed toward the outer surface of the preform. The mandrel is removed and the resultant hollow soot preform is supported in a draw furnace through which a helium-rich gas flows. The preform is heated to a temperature sufficient to cause said soot to consolidate and simultaneously permit an optical waveguide filament to be drawn therefrom.

    Abstract translation: 通过火焰水解技术制造玻璃光波导的方法。 通过火焰水解产生的玻璃烟炱颗粒沉积在心轴的外表面上以形成多孔预制件。 靠近心轴的烟灰颗粒的折射率大于朝向预成型体的外表面设置的烟灰的折射率。 将心轴移除,并将得到的空心烟炱预制件支撑在富氦气流经的拉制炉中。 将预成型件加热到足以使所述烟灰固结并同时允许从其中拉出光波导细丝的温度。

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