Etat Francais Represente Par Le Ministere Des Postes

Marie-Eve Davoust

Serge Saada

Patrick Chollet

Monique Moisan

Dominique Pavy

It realizes the chemical vapour phase deposition method using a plasma maintained by surface waves in a tube (2) for obtaining a preform and comprises photodetection means (50) sensitive to the light emitted by the deposition area (54) of the vitreous coating resulting from the reaction between appropriate gaseous compounds and able to supply information relative to the emission area of said light, and means (52) for controlling the displacement of the deposition area, displacement being such that the thickness of the coating is uniform in the tube, and control means controlling the power of the microwave generator (30) of the apparatus as a function of the information. Application to the field of telecommunications.

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Michel S/Orge, France

Marie-Eve Davoust