With a synthetic quartz tube glass refractive index than a high rate through a quartz tube on the inner surface of the coating layer, and when the furnace on the drawing through drawing, the contraction of the optical fiber manufacturing process comprises the following steps, the quartz tube coated synthetic glass, inside the quartz tube is equal to the outer diameter ratio 0.85 or less, then one end sealed quartz tube to form a closed end of the quartz tube is clamped in the drawing furnace in quartz tube internal pressure is negative, by drawing from the closed end, so it can prevent from external water mixed, and reliable and stable for drawing and contraction steps.
【技术实现步骤摘要】
【技术保护点】
在向石英管的内侧使被覆比该石英管折射率高的合成玻璃,然后用拉丝炉将其一面进行拉丝并进行收缩,从而得到光纤的光纤制造方法中,其特征是在向上述石英管内侧被覆上述合成玻璃,并要使石英管的内径/外径的比值成为0.85mm以下以后,将上述石英管的一端封止住,从而形成封止端,接着使上述石英管保持在拉丝炉中,而且一面使该石英管的内压保持为负压,一面从上述封止端进行光纤拉丝的光纤制造方法。
【技术特征摘要】
...
【专利技术属性】
技术研发人员:神谷保,芝山康弘,内山顺仁,佐藤升,
申请(专利权)人:古河电气工业有限公司,
类型:发明
国别省市:JP[日本]
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