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High density riser and plenum breakout cables for indoor and outdoor cable applications

  • US 5,857,051 A
  • Filed: 04/21/1997
  • Issued: 01/05/1999
  • Est. Priority Date: 04/21/1997
  • Status: Expired due to Fees
First Claim
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1. An optical fiber ribbon bundle comprising:

  • (a) a plurality of ribbon structures, each of said ribbon structures comprising;

    (i) a plurality of optical fibers, each of said optical fibers being adjacent to another optical fiber, wherein each said ribbon structure has a single layer of optical fibers and each said ribbon structure has a top side above said layer of optical fibers and a bottom side below said layer of optical fibers, when said layer of optical fibers is viewed on edge through a cross-section thereof;

    (ii) at least one strength member being positioned along one of said top side or said bottom side, said at least one strength member being made of a fiber material having a breaking strength which is substantially greater than that of said optical fibers; and

    (iii) a protective sheath which surrounds said optical fibers and said strength member;

    (b) a subunit sheath which surrounds all of said ribbon structures within said ribbon bundle; and

    (c) said ribbon structures filling a portion of space inside of said subunit sheath with a remainder of said space being filled by air.

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