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US 6,334,015 B2Granted
Cable with optical fibers retained in a sheath
AssigneeSagem SA
InventorPatrick Jamet
Life of this patent
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AssigneeSagem SA
InventorPatrick Jamet
Estimating the term…
In order to prevent microcurvatures in the optical fibers when the cable is subjected to temperature variations in the range from approximately −40° C. to approximately +85° C., a cable with N optical fibers (FO) each having a core (1) and a coating (2) with coefficients of thermal expansion/compression α1 and α2, Young's modulus in traction E1 and E2 and sections S1 and S2 comprises a retaining sheath (3) enveloping the optical fibers buried in a filling material (4) having a coefficient of thermal expansion/compression α4, Young's modulus in traction E4 and section S4. The sheath (3) satisfies the condition: (α3.E3.S3)≦[(α1.E1.S1)+(α2.E2.S2)](N/14)+(α4.E.4.S4) in which α3, E3 and S3 are respectively the coefficient of thermal expansion/compression, the Young's modulus in traction and the section of the sheath.
A cable comprising N optical fibers each having a core with a coefficient of thermal expansion/compression α1, a Young's modulus in traction E1 and a section S1 and a coating with a coefficient of thermal expansion/compression α2, a Young's modulus in traction E2 and a section S2, a retaining sheath enveloping the optical fibers, and a filling material between the optical fibers and the retaining sheath having a coefficient of thermal expansion/compression α4, a Young's modulus E4 in traction and a section S4, said retaining sheath having a coefficient of thermal expansion/compression α3, a Young's modulus in traction E3 and a section S3 satisfying the following condition:
Dependencies are inferred from the claim text.