| 摘要 |
<p>Methods are disclosed for manufacturing a cylindrical glass optical waveguide preform having low water content for use in the manufacture of optical waveguide fiber.</p><p><Paragraphs id="pa02" num="0002" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">The glass optical waveguide preform has a water content sufficiently low such that an optical waveguide fiber producible from the glass optical waveguide preform exhibits an optical attenuation of less than about 0.35 dB/km, and preferably less than about 0.31 dB/km, at a measured wavelength of 1380 nm. Methods are also disclosed for manufacturing glass preforms used in the manufacture of such a glass optical waveguide preform that combine the vapor axial deposition (VAD) and outside vapor deposition (OVD) techniques.
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