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All-dielectric, self-supporting, loose-tube cable with optical fiber ribbons

  • US 6,185,351 B1
  • Filed: 10/15/1999
  • Issued: 02/06/2001
  • Est. Priority Date: 10/15/1999
  • Status: Expired due to Term
First Claim
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1. An all-dielectric, self-supporting fiber optic cable that is adapted to be subjected to constant tensile loading during use, the fiber optic cable comprising:

  • a longitudinally extending central strength member;

    a plurality of stacks of optical fiber ribbons, wherein each optical fiber ribbon comprises an array of optical fibers that are bound together as a unit;

    a plurality of buffer encasements respectively containing the stacks of optical fiber ribbons, wherein each buffer encasement is longitudinally stranded around the central strength member to define a lay length of at least approximately 400 millimeters, and for each of the stacks of optical fiber ribbons and its respective buffer encasement the maximum diagonal cross-dimension of the stack of optical fiber ribbons divided by the interior diameter of the buffer encasement is not less than approximately 0.68;

    a longitudinally extending outer strength assembly extending around the plurality of buffer encasements; and

    a longitudinally extending sheath extending around the outer strength assembly.

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