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    • 7. 发明申请
    • Methods for Producing Optical Fiber Preforms with Low Index Trenches
    • 用于生产具有低指数倾斜度的光纤预制件的方法
    • US20130000840A1
    • 2013-01-03
    • US13173777
    • 2011-06-30
    • Steven Bruce DawesRobert A. KnowltonPushkar TandonJi Wang
    • Steven Bruce DawesRobert A. KnowltonPushkar TandonJi Wang
    • B32B37/00
    • C03B37/01211C03B37/01446C03B37/01453C03B37/01466C03B2201/12C03B2203/22C03B2207/36C03B2207/66C03B2207/70
    • Methods for forming optical fiber preforms with low-index trenches are disclosed. According to one embodiment, the method includes depositing silica-based glass soot on a bait rod to form a low-index trench region of the optical fiber preform. The silica-based glass soot is deposited such that the low-index trench region has a first density. Thereafter a barrier layer having a second density greater than the first density is formed around the low-index trench region. Therafter, an overclad region is deposited around the barrier layer. The bait rod is then removed from a central channel of the trench-overclad assembly. A separate core assembly is inserted into the central channel. A down-dopant gas is then directed through the central channel of the trench-overclad assembly as the trench-overclad assembly is heated to dope the low-index trench region. The barrier layer prevents diffusion of the down-dopant from the low-index trench region into the overclad region.
    • 公开了用于形成具有低折射率沟槽的光纤预制棒的方法。 根据一个实施方案,该方法包括在诱饵棒上沉积二氧化硅基玻璃烟炱以形成光纤预制棒的低折射率沟槽区域。 沉积二氧化硅基玻璃烟炱,使得低折射率沟槽区域具有第一密度。 此后,在低折射率沟槽区域周围形成具有大于第一密度的第二密度的阻挡层。 Therafter,一个外包层区域沉积在阻挡层周围。 然后将诱饵棒从沟槽外包装组件的中心通道移除。 单独的芯组件插入中心通道。 然后,随着沟槽外包层组件被加热以掺杂低折射率沟槽区域,下掺杂剂气体被引导通过沟槽外包层组件的中心通道。 阻挡层防止下掺杂剂从低折射率沟槽区域扩散到外包层区域中。