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Stretchable fiber optic cable

  • US 8,805,144 B1
  • Filed: 02/27/2014
  • Issued: 08/12/2014
  • Est. Priority Date: 09/24/2013
  • Status: Active Grant
First Claim
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1. A fiber optic cable, comprising:

  • a strength member configured to provide tensile strength as well as anti-buckling strength, wherein the strength member is a rod;

    tubes, each tube having a cavity, wherein the strength member provides reinforcement to the tubes, wherein the rod is a central strength member and wherein the tubes are wound around the rod in a pattern of reverse-oscillatory winding, wherein the tubes are generally round in cross-section and have an average outer diameter of 3 millimeters or less, wherein the tubes have an average inner diameter of 2 millimeters or less; and

    a binder sleeve, wherein the tubes are bound to the central strength member with the binder sleeve that relatively evenly distributes radially inward force to the tubes; and

    optical fibers packed into the cavity of each tube such that the optical fibers bend therein, having excess optical fiber length providing a strain window such that the optical fibers experience less than 0.5 dB/km of increased average attenuation at 1310 nanometers wavelength when the cable experiences strain of up to 1% compared to when unstrained.

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