Draka Comteq B.v.

Draka Fibre Technology B.v.

Plasma Optical Fibre B.v.

Henrikus Lambertus Maria Jansen

Dennis Robert Simons

Mattheus Jacobus Nicolaas Van Stralen

Pieter Matthijsse

Antonius Henricus Elisabeth Breuls

Marinus Jacob De Fouw

Johanna Catharina Van Lierop Jansen, Legal Representative

Antonius Cornelis Johannes Maria De Vetter

Antonius Cornelis Johannus Maria De Vetter

The present invention relates to a method and a device for manufacturing optical performs, in which one or more layers of glass, doped or undoped, are deposited onto the internal surface of a hollow substrate tube, which deposition is effected by supplying one or more reactive gas mixtures of glass-forming compounds tot the interior of the hollow substrate tube and subsequently generating a non-isothermal plasma in the hollow substrate tube, after which the preform is subjected to a contraction process for the purpose of forming a massive rod, from which optical fibres are drawn.

Method and device for manufacturing optical preforms, as well as the optical fibres obtained therewith

The present invention relates to a method for producing a preform, which is substantially free of OH impurities, for an optical fiber, wherein one or more quartz layers, which may or may not be doped, are deposited on the internal surface of a quartz glass support tube, in which method a furnace is moved axially with respect to the support tube, and after the quartz layers have been deposited the support tube is contracted into a bar-shaped preform while being heated, wherein the furnace comprises an electrical resistance furnace, in which furnace the support tube is rotated, with the space between the rotating support tube and the furnace being washed with an inert gas.

MCVD/PCVD method for making a preform with movement of a furnace

The invention relates to a device for manufacturing a preform, wherein a carrier tube is collapsed to a preform, which device comprises a heating element forming a cylindrical envelope, which envelope defines an annular inlet opening and an annular outlet opening at opposite ends of the envelope, a carrier tube being present within the cylindrical envelope, between said openings, the heating element being movable in axial direction with respect to the carrier tube, and means for supplying a non-oxidizing gas to the space between the carrier tube and the envelope.

Device and method for manufacturing a preform

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Bergeijk, Netherlands

Henrikus Lambertus Maria Jansen