Cable with optical fibres maintained in a sheath

Details Cable with optical fibres maintained in a sheath Cable with optical fibres maintained in a sheath

G - Physics

02

B

G02B 6/44 (2006.01)

Patent

CA 2349921

In order to prevent the formation of microbends in the fibres when the cable is subjected to temperature variations between -40 ~C and +85 ~C approximately, a cable with N optical fibres (FO) each having a core (1) and a coating (2) with thermal expansion/compression coefficients .alpha.1 and .alpha.2, tractive moduli of elasticity E1 and E2 and cross-sections S1 and S2 comprises a retaining sheath (3) enclosing the optical fibres embedded in a filling material (4) with thermal expansion/compression coefficient .alpha.4, tractive modulus of elasticity E4 and cross-section S4. The sheath satisfies the unequation: (.alpha.3.E3.S3) <= [.alpha.1.E1.S1) + (.alpha.2.E2.S2)] (N/14) + (.alpha.4.E4.S4) where .alpha.3, E3 and S3 are the thermal expansion/compression coefficient, the tractive modulus of elasticity and the cross-section of the sheath.

Pour empêcher des microcourbures dans les fibres optiques lorsque le câble est soumis à des variations de température de -40·C à +85·C environ, un câble à N fibres optiques (FO) ayant chacune un coeur (1) et un revêtement (2) de coefficients de dilatation/compression thermique .alpha.1 et .alpha.2, de modules d'Young en traction E1 et E2 et de sections S1 et S2 comprend une gaine de maintien (3) enveloppant les fibres optiques noyées dans une matière de remplissage (4) de coefficient de dilatation/compression thermique .alpha.4, de module d'Young en traction E4 et de section S4. La gaine (3) satisfait l'inégalité: (.alpha.3.E3.S3) <= [(.alpha.1.E1.S1)+(.alpha.2.E2.S.)](N/14)+(.alpha.4.E4.S4) ou .alpha.3, E3 et S3 sont le coefficient de dilatation/compression thermique, le module d'Young en traction et la section de la gaine.

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