Alcatel

Alcatel Fibres Optiques

Alcatel Fibers Optques

Max Matau

Alain Drouart

Jean-Francedillaois Bourhis

Pierre Sillard

Louis-Anne De Montmorillon

Pascale Nouchi

Yves Lumineau

Ludovic Fleury

Pierre Ripoche

Bernard Floch

Pascal Mazabraud

Bernard Jouvenel

Benoit Gouez

Patrick Mac Kenzie

Jean-Pierre Bloas

Philippe Darbon

The invention relates to a method of fabricating an optical fiber with improved control of transmission characteristics. It proposes determining variations in the characteristics of the preform departing from the design characteristics and modifying the diameter of the fiber during drawing as a function of the measured variations. By varying the diameter of the fiber, variations in the preform departing from its design values can be compensated, in other words irregularities of the preform can be smoothed out. This variation limits the effect of preform variations on the propagation characteristics of the fiber.

Method of fabricating an optical fiber with controlled transmission characteristics

A method and apparatus for manufacturing optical fibers provided with hermetic coatings, wherein the bare fiber made from a heated preform advances through a stream of reactive gaseous medium which flows at a constant speed in the direction of advance of the fiber, which is then accelerated, and which is finally removed remote from the fiber by a stream of inert gas flowing in the opposite direction from the direction of the stream of reactive gaseous medium. Application is to manufacturing optical fibers for telecommunications.

Method and apparatus for manufacturing an optical fiber provided with a

The invention relates to a method of coating an optical fiber, the method comprising the following steps: applying a polymerizable coating material to the surface of the optical fiber; and polymerizing said material to obtain a coating. In the method, the optical fiber prior to application of said material is raised to a value T determining the value T' of the temperature at which said material polymerizes.

Method of coating an optical fiber

A device for drawing down an optical fiber preform (2) connected at one end to a feed rod (3) having an equal or smaller diameter. A chamber (11) in which the preform is drawn has an upper part (11A) with an opening (12). The opening engages the preform to seal the chamber. An enclosure (5) has a seal (6) at its upper part (5A) for sealing around the feed rod. A lower part (5B) of the enclosure contacts the upper part of the chamber to seal the chamber while the feed rod is passing through the opening.

Device for drawing down an optical fiber preform

The present invention relates to a method of detecting whether at least one die is centered about a thread held taught between two fixed points separated by a distance L, wherein:

Method of detecting whether at least one die is centered about a thread

A method of using a plasma to build up an optical fiber preform consists in injecting hydroxyl ions in a controlled manner into the build-up silica that is deposited on the preform. The invention is applicable to the manufacture of optical fibers, in particular monomode fibers.

Method of building up an optical fiber preform by plasma deposition, and

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Villeneuve la Garenne, France

Max Matau