Optical cable
AssigneeNorthern Telecom Limited
InventorRobert J. Williams
Life of this patent
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Abstract
Optical cable with waveguides received in recesses of a crush resistant central core, and a protective sheath surrounding the core, an inner layer of the sheath comprising metal and being carried upon ribs of the core which define the recesses. The metal layer may be corrugated circumferentially and coated with polymeric material. An outer layer of the sheath is an impermeable polymeric material. The ribs preferably extend along the core at an angle to its axis.
Claims6
An optical cable comprising a longitudinally extending crush resistant central core formed with a plurality of circumferentially spaced, longitudinally extending ribs defining grooves between the ribs, a plurality of waveguides extending along the grooves, and a protective sheath surrounding the core and waveguides, the sheath comprising an inner metal layer and an outer water impermeable polymeric layer, the metal layer extending around the core to be carried upon outer ends of the ribs and the metal layer formed with circumferentially extending corrugations.
An optical cable comprising a longitudinally extending crush resistant central core formed with a plurality of circumferentially spaced ribs which extend longitudinally of the core and around the core at an angle of the axis of the core, the ribs being tapered towards their inner ends and defining grooves between the ribs, a plurality of waveguides extending along the grooves, and a protective sheath surrounding the core and waveguides, the sheath comprising an inner metal layer having corrugations lying at a different angle to the core axis from the angle of the ribs, overlapped ends to form an axially extending overlap, and a coating on its outer surface of a polymeric material, the sheath also comprising a layer outwardly of the metal layer of polymeric material compatible with and bonded to the polymeric material of the coating.
Dependencies are inferred from the claim text.