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    Large preform for singlemode fiber and method for making same
    1.
    发明公开
    Large preform for singlemode fiber and method for making same 有权
    Grosse Vorformfüreinzelne Fasern und Verfahren zu deren Herstellung

    公开(公告)号：EP0972752A1

    公开(公告)日：2000-01-19

    申请号：EP99305360.2

    申请日：1999-07-06

    Applicant: LUCENT TECHNOLOGIES INC.

    Inventor： Glodis, Paul Francis ,  Gridley, Charles Francis ,  Jablonowski, Donald Paul ,  Kalish, David ,  Walker, Kenneth Lee

    IPC: C03B37/018 ,  C03B37/012

    CPC classification number: C03B37/01211 ,  C03B37/01869 ,  C03B37/01884 ,  C03B37/01892 ,  C03B2201/02 ,  C03B2201/04 ,  C03B2201/075 ,  C03B2203/24

    Abstract: A large optical preform [303] is made by a modified chemical vapor deposition (MCVD) process by depositing successive layers of core and cladding materials onto the inside surface of a rotating glass tube [33] having a hydroxyl ion (OH - ) level that is less than 0.5 parts per million (ppm) by weight. The tube is then collapsed inwardly to form a core rod [301] in which the deposited core material [31] has a diameter that is greater than about 5 millimeters and the deposited cladding material [32] has an outside diameter that is less than about 15 millimeters. Optionally a machine-vision system [140,150,160] monitors and controls the diameter of the glass tube by regulating the pressure within the tube; moreover, the machine-vision system monitors and controls the straightness of the tube by varying its rotational speed according to angular position. After the core rod [301] is formed, it may be plasma etched to remove contaminants, it is overclad with two glass jackets [34,35] having a hydroxyl ion (OH - ) level that is less than 1.0 ppm by weight thereby creating a large preform [303] from which about 400 kilometers of singlemode optical fiber can be drawn per meter of length of preform.

    Abstract translation: 通过改进的化学气相沉积（MCVD）工艺，通过将连续的芯和包层材料层沉积到具有较小的羟基离子（OH - ））水平的旋转玻璃管Ä33的内表面上来制造大型光学预制件 超过百万分之0.5（ppm）重量。 管然后向内折叠以形成芯棒Ä301Ü，其中沉积的芯材Ä31Ü具有大于约5毫米的直径，并且沉积的包层材料Ä32具有小于约15毫米的外径。 可选地，机器视觉系统Ä140,150,160Ü通过调节管内的压力来监视和控制玻璃管的直径; 此外，机器视觉系统通过根据角位置改变其转速来监视和控制管的直线度。 在形成芯棒Ä301Ü之后，可以等离子体蚀刻以除去污染物，它被两个玻璃外套Ä34,35Ü包覆，其中羟基离子（OH - ）的含量低于1.0重量ppm，从而产生大的 预制件Ä303Ü，每米长度的预制件可以从其中吸取约400公里的单模光纤。

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