Optical fiber cable products having a stress indicating capability and process for making same
First Claim
Patent Images
1. A fiber optic cable, comprising:
- an optical fiber, said fiber comprising a core and a cladding concentrically disposed about said core; and
a layer of multi-phase material concentrically disposed about said cladding, said multi-phase material irreversibly changing color when subjected to stress.
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Accused Products
Abstract
A fiber optic cable having stress indicating means and a method for making same. The stress indicating means provides a cost effective method for determining whether an optical cable has been bent, stressed or otherwise mishandled, which may cause optical loss when the cable is placed in service. Broadly stated, the fiber optic cable according to the instant invention includes an optical fiber, comprised of a core and a cladding and a stress indicator concentrically disposed about the fiber that changes color when subjected to stress. A technician can thereby visually identify cables that have been bent or mishandled and subject them to testing before installation.
48 Citations
29 Claims
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1. A fiber optic cable, comprising:
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an optical fiber, said fiber comprising a core and a cladding concentrically disposed about said core; and a layer of multi-phase material concentrically disposed about said cladding, said multi-phase material irreversibly changing color when subjected to stress. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fiber optic cable, comprising:
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a core; a cladding concentrically disposed about said core, said cladding being coated with a radiation cured acrylic material; a buffer concentrically disposed about said acrylic coated cladding; stress indicating means comprising a layer of multi-phase material concentrically disposed about said buffer, said multi-phase material changing color when subjected to stress; a layer of strengthening material concentrically disposed about said stress indicating means. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A stress indicator for use on a jacketed cable, comprising:
a layer of multi-phase material concentrically disposed about a jacket of the jacketed cable, said multi-phase material irreversibly changing color when subjected to stress. - View Dependent Claims (16, 17, 18, 19)
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20. A fiber optic cable, comprising:
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an optical fiber, the fiber comprising a core, a cladding concentrically disposed about said core, and a buffer layer concentrically disposed about said cladding; and stress indicating means comprising a layer of colored multi-phase material concentrically disposed about said buffer layer, said colored multi-phase material irreversibly changing color when subjected to stress. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification