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    • 14. 发明申请
    • LOW-WATER OPTICAL FIBER PREFORM AND PROCESS FOR MAKING IT
    • 低水光纤预制棒及其制造工艺
    • WO2006083354A3
    • 2006-11-30
    • PCT/US2005042079
    • 2005-11-17
    • NEXTROM HOLDING SASARKAR ARNABORCHANIAN BEDROSVO KIM NHU
    • SARKAR ARNABORCHANIAN BEDROSVO KIM NHU
    • C03B37/014
    • C03B37/0144C03B37/01406C03B37/01413C03B37/0142C03B2201/12C03B2201/31C03B2203/22C03B2207/50
    • An improved flame-hydrolysis process is disclosed, for manufacturing large optical fiber core preforms, useful in the production of low water, single-mode optical fibers. In one feature of the invention, the preform is manufactured using a vapor axial deposition (VAD) apparatus to form an inner core and an outside vapor deposition (OVD) apparatus to form an outer core, wherein the VAD and OVD apparatus both are located within the same housing. In another feature of the invention, the concentration of a germanium dopant in the inner and outer cores is substantially uniform, but increases immediately adjacent the outer surface of the outer core. Further, the concentration of a fluorine dopant in a surrounding cladding layer decreases from a maximum value immediately adjacent to the outer core. These variations in dopant concentrations are selected to offset the effect on refractive index caused by diffusion of the germanium dopant while the preform is subsequently being processes.
    • 公开了一种改进的火焰水解工艺,用于制造大型光纤芯预制棒,用于生产低水,单模光纤。 在本发明的一个特征中,使用气相轴向沉积(VAD)设备来形成预成型件以形成内芯和外部气相沉积(OVD)设备以形成外芯,其中VAD和OVD设备都位于 同一个房屋。 在本发明的另一特征中,内芯和外芯中的锗掺杂剂的浓度基本均匀,但紧邻外芯的外表面增加。 此外,周围包层中的氟掺杂剂的浓度从紧邻外芯的最大值开始减小。 选择掺杂剂浓度的这些变化是为了抵消随着锗掺杂剂扩散而导致的对折射率的影响,同时预制棒正在被处理。