E.i. Dupont De Nemours and Company

Alcatel

Alcatel Fibres Optiques

Gerard Orcel

Sophie Vanpoulle

Eric Lacroix

Marie-Jose Lina

Robert Overton

Jean-Francedillaois Regnier

Fluorinated diol and method for the production thereof

A method of coating an optical fiber, the method including at least one coating step using a coating composition and at least one polymerization step, the composition including a curable formulation and a compound having a low vaporization temperature, the quantity, by weight, of the compound having a low vaporization temperature lying in the range 0.5% to 20% of the composition, the vaporization temperature lying between the coating temperature and the polymerization temperature. The coating composition includes an acrylate resin and an ether, the quantity, by weight, of the ether lying in the range 0.5% to 20% of the composition. The ether can be an alkyl ether, in particular.

Coating compositions for optical fibers, and a method of coating optical

Device for injecting non-oxidizing gas into a furnace with a graphite concentrator (12) as the heating element used to heat a primary preform in the enclosure of the furnace (14) and moving relative to the furnace in its axial direction, and comprising at the inlet orifice (24) and at the outlet orifice (26) of the enclosure a respective annular injector (40, 42) for injecting two conical curtains of non-oxidizing gas, the gas for each of the curtains being directed towards the apex of the cone and in the direction away from the enclosure (14) so as to prevent any entry into the enclosure of air that could cause combustion of the graphite.

Device for injecting non-oxidizing gas into a furnace

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Maison Laffite, France

Gerard Orcel