Optical fiber cable coated with conductive metal coating and...

G - Physics – 02 – B

Patent

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88/97.1

G02B 6/44 (2006.01) C03C 25/10 (2006.01)

Patent

CA 2024266

24 Disclosed is an optical fiber cable free from a generation of a microbent during manufacturing, and in which an impregnation of hydrogen and/or water to a cladding is prevented, and having an electrical conduction, a tolerance to heat and a mechanical strength, and a process for making same. The optical fiber cable includes a silica based glass optical fiber including a core and a cladding, a thin carbon coating formed on an outer surface of the optical fiber, and an electrically conductive coating formed on an outer surface of the carbon coating. The carbon coating functions as a layer for preventing the impregnation of hydrogen and/or water to the optical fiber, and the conductive coating functions as a heat tolerance member, a conductive member, and a mechanical support member. The carbon coating is preferably formed as an amorphous carbon layer. Preferably, the conductive coating can be materials having a good contact with the carbon coating, a high conductivity, a high heat tolerance, and a high strength, and can be formed as thin as possible. The conductive coating can be formed by a plurality of different metal layers having different thickness.

Cette invention concerne un câble à fibre optique sans microcourbures de fabrication, dont la gaine est protégée contre l'imprégnation par l'hydrogène et/ou l'eau et qui conduit l'électricité, résiste à la chaleur et présente une bonne résistance mécanique, ainsi que sa méthode de fabrication. Le câble objet de l'invention comprend une fibre optique en verre de silice à coeur gainé ayant une mince couche de carbone sur sa surface extérieure et un revêtement conducteur d'électricité sur ladite couche de carbone. La couche de carbone sert à prévenir la pénétration d'hydrogène et/ou d'eau dans la fibre optique tandis que la couche conductrice a un rôle de protection thermique, de conduction d'électricité et de renfort mécanique. La couche de carbone est de préférence du type amorphe. De préférence, le revêtement conducteur est en matériau qui forme un bon contact avec la couche de carbone et qui présente, en plus de se prêter à la formation en couche très mince, une conductivité et une résistance thermique et mécanique élevées. Le revêtement conducteur peut comporter plusieurs couches métalliques différentes d'épaisseurs variées.

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