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Loose tube optical ribbon cable

  • US 6,751,383 B2
  • Filed: 09/05/2002
  • Issued: 06/15/2004
  • Est. Priority Date: 04/30/2002
  • Status: Expired due to Term
First Claim
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1. A loose tube, optical-ribbon cable comprising:

  • a central tensile-strength component situated in the center of the optical-ribbon cable;

    a plurality of loose tubes having a bundle of optical-ribbon fibers surrounding the central tensile-strength component and disposed in parallel arrangement, one to each other, the bundle of optical-ribbon fibers being formed by laminating the optical-ribbon fibers, each optical-ribbon fiber including multiple cores of optical fibers stranded in a single row and a sheath surrounding the multiple cores of optical fibers;

    a plurality of circle-shaped, water-absorbing members disposed in hollows between the plurality of tubes, the members comprising a plurality of twisted yarns, some of which are water-absorbing, and a remainder of which have a certain degree of strength, each water-absorbing member comprising a predetermined number of each type of yarn that are both twisted together to maintain a shape of the circle-shaped, water-absorbing members;

    a water-absorbing tape for surrounding the plurality of loose tubes and the plurality of circle-shaped, water-absorbing members; and

    , an external sheath forming an outermost layer of the optical-ribbon cable, for protecting an interior of the loose tube, optical-ribbon cable against an external environment.

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