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    • 9. 发明授权
    • Optical cable housing an optical unit surrounded by a plurality of gel layers
    • 光缆容纳由多个凝胶层包围的光学单元
    • US06714707B2
    • 2004-03-30
    • US10053627
    • 2002-01-24
    • Michael T. RossiNicholas V. NechitailoBrian Risch
    • Michael T. RossiNicholas V. NechitailoBrian Risch
    • G02B644
    • G02B6/4429
    • An optical fiber cable including a buffer tube wherein the optical unit is maintained in an axial center location of the buffer tube and protected from contact with an inner wall of the buffer tube. At least first and second gel layers are interposed between the buffer tube and the optical unit, wherein the first gel layer surrounds the optical unit, the second gel layer surrounds the first gel layer, and the first and second gel layers have different rheological properties. The inner gel layer may have a yield stress and a viscosity which are lower than a yield stress and a viscosity of the outer gel layer. The lower yield stress and viscosity of the inner gel layer serves to maintain the optical unit in an axial center position within the buffer tube and facilitates easy re-positioning of the optical unit to the axial center position when the buffer tube is flexed or bent. As a result, the optical unit may be maintained in a low stress state and stress-induced attenuation may be prevented.
    • 一种包括缓冲管的光纤电缆,其中所述光学单元保持在所述缓冲管的轴向中心位置并且防止与所述缓冲管的内壁接触。 至少第一和第二凝胶层介于缓冲管和光学单元之间,其中第一凝胶层围绕光学单元,第二凝胶层围绕第一凝胶层,第一和第二凝胶层具有不同的流变特性。 内部凝胶层可以具有低于屈服应力和外部凝胶层的粘度的屈服应力和粘度。 内凝胶层的较低的屈服应力和粘度用于将光学单元保持在缓冲管内的轴向中心位置,并且便于当缓冲管弯曲或弯曲时将光学单元容易地重新定位到轴向中心位置。 结果,光学单元可以保持在低应力状态,并且可以防止应力引起的衰减。