G - Physics – 02 – B
Patent
G - Physics
02
B
88/97.1
G02B 6/44 (2006.01)
Patent
CA 1046319
ABSTRACT OF THE DISCLOSURE An optical fibres communications cable comprises one or more core elements and protective layers, including armouring layers and an outer plastics sheath, disposed around the core element or elements. Each core element comprises a plurality of optical fibres laid up around an elongate member of relatively high tensile strength, for example a cord comprising glass fibres stranded together. A cushioning layer is disposed around the optical fibres and a second cushioning layer is disposed between the elong- ate member and the optical fibres : these cushioning layers, for example comprising extruded cellular plastics, cushion the optical fibres against cross-sectional distortion during manufacture and laying of the cable. A moisture barrier layer is provided around the core element or around each individual core element or around the bunch of core elements to provide a barrier against the ingress of moisture. A sleeve encloses each indiv- idual optical fibre but permits at least limited relative twisting between the sleeve and optical fibre to enable the optical fibres to be laid with- out torsion.
222525
Na
Pirelli General Cable Works Limited
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