Optical cable element and cable, respectively, and method of manufacturing same
First Claim
Patent Images
1. An optical cable element comprising:
- one or more optical waveguides, said waveguides not being coupled to each other;
a plurality of strength fibers loosely surrounding the waveguides, said strength fibers extending substantially parallel to each other and to the waveguides, said strength fibers not being coupled to each other or to the waveguides; and
a mantle surrounding the waveguides and fibers;
characterized in that;
the waveguides and fibers occupy 50% to 90% of the volume of the cable element within the mantle, the remaining volume being occupied by air;
each optical waveguide is provided with a thin secondary coating; and
the strength fibers have diameters which are proportioned such that the free effective length of the strength fibers is less than 50% that of the optical waveguides.
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Abstract
An optical cable element includes an optical waveguide loosely embedded in a bundle of strength fibers. A protective mantle surrounds the waveguide-containing bundle of strength fibers.
69 Citations
8 Claims
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1. An optical cable element comprising:
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one or more optical waveguides, said waveguides not being coupled to each other; a plurality of strength fibers loosely surrounding the waveguides, said strength fibers extending substantially parallel to each other and to the waveguides, said strength fibers not being coupled to each other or to the waveguides; and a mantle surrounding the waveguides and fibers; characterized in that; the waveguides and fibers occupy 50% to 90% of the volume of the cable element within the mantle, the remaining volume being occupied by air; each optical waveguide is provided with a thin secondary coating; and the strength fibers have diameters which are proportioned such that the free effective length of the strength fibers is less than 50% that of the optical waveguides.
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2. An optical cable element comprising:
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one or more optical waveguides, said waveguides not being coupled to each other; a plurality of strength fibers loosely surrounding the waveguides, said strength fibers extending substantially parallel to each other and to the waveguides, said strength fibers not being coupled to each other or to the waveguides; and a mantle surrounding the waveguides and fibers; characterized in that; the waveguides and fibers occupy 50% to 90% of the volume of the cable element within the mantle, the remaining volume being occupied by air; each optical waveguide is provided with a thin secondary coating; the mantle comprises an inner layer of synthetic material having a modulus of electicity; and the mantle comprises an outer layer of material surrounding the inner layer, said outer layer having a modulus of elasticity which is less than 50% of the modulus of elasticity of the inner layer. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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Specification