| http://www.w3.org/ns/prov#value | - That optical fiber comprises a core of radius R, made of doped silica, and of diameter 50 ??m, corresponding to 2 R, and, around the core, a sheath that takes the diameter of the optical fiber to 125 ??m, i.e 5 R, and that comprises cladding taking the diameter to 90 ??m, i.e. 3.6 R, and an outer sheath, of thickness equal to 17.5 ??m, i.e. 0.7 R. The concentration of oxide in said outer sheath pr
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