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High count optical fiber distribution cable

  • US 4,881,795 A
  • Filed: 02/03/1989
  • Issued: 11/21/1989
  • Est. Priority Date: 02/03/1989
  • Status: Expired due to Fees
First Claim
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1. A high count optical fiber distribution cable having optical fiber attenuation stability over a range of temperatures comprising:

  • (a) A center sub-unit comprising a sub-unit center strength member and at least one buffer tube stranded about said center sub-unit forming a single helix, said center strength member having a tensile strength of at least 4,350,000 psi and a coefficient of thermal expansion of no more than 25×

    106 Cm/Cm/°

    C.;

    (b) one or more additional sub-units stranded about the center sub-unit each additional sub-unit comprising at least one buffer tube stranded in a double helix configuration and a sub-unit strength member, each buffer tube stranded about said sub-unit strength member and each sub-unit strength member having a tensile strength of at least 4,350,000 psi and a coefficient of thermal expansion of no more than 25×

    106 Cm/Cm/°

    C.; and

    ,(c) 300 or more elongated optical fibers, in one or more of said buffer tubes, that vary no more than 0.2 db/km in attenuation when said high count optical fiber distribution cable is subjected to temperatures between -40° and

    70°

    C. at wavelengths of 1310 nm and 1550 nm.

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