Optical cable provided with a mechanically resistant covering

G - Physics – 02 – B

Patent

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Details

G02B 6/44 (2006.01)

Patent

CA 2449023

The present invention relates to an optical cable comprising at least one element for the transmission of optical signals, and a structure that is able to protect said at least one element. Said structure is a multilayer structure and is arranged in a position radially external to said at least one element and comprises: a) at least one first covering layer of polymeric material in a position radially external to said at least one element; b) at least one covering layer of foamed polymeric material in a position radially external to said at least one first covering layer, and c) at least one second covering layer of polymeric material in a position radially external to said at least one covering layer of foamed polymeric material. The foamed polymeric material has a density between 0.3 and 0.7 kg/dm3 and tensile modulus at 20~C between 300 and 700 MPa. The present invention further relates to a multilayer structure of the type as above and a method for the protection of at least one element for the transmission of optical signals.

L'invention concerne un câble optique comprenant au moins un élément destiné à la transmission de signaux optiques, ainsi qu'une structure pouvant protéger cet élément. Cette structure est une structure à couches multiples, placée dans une position radialement extérieure audit élément, et comprend a) au moins une première couche de revêtement de matériau polymère dans une position radialement extérieure audit élément, b) au moins une couche de revêtement de matériau polymère expansé dans une position radialement extérieure à la première couche de revêtement, et c) au moins une seconde couche de revêtement d'un matériau polymère en position radialement extérieure à la couche de revêtement de matériau polymère expansé. Le matériau polymère expansé possède une densité comprise entre 0,3 et 0,7 kg/dm?3¿ et un module d'élasticité en traction à 20 ·C compris entre 300 et 700 MPa. L'invention concerne également une structure à couches multiples du type de celle décrite ci-dessus, ainsi qu'un procédé pour la protection d'au moins un élément destiné à la transmission de signaux optiques.

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