Draka Comteq B.v.

Momentive Performance Materials Gmbh

Draka Fibre Technology B.v.

Rob Hubertus Matheus Deckers

Mattheus Jacobus Nicolaas Van Stralen

Igor Milicevic

Dennis Robert Simons

Marco Korsten

Johannes Antoon Hartsuiker

Frans Gooijer

Eric Aloysius Kuijpers

Cedric Gonnet

Ivo Flammer

Larry Qiang Zeng

Guangjun Xu

Koen De Jongh

Jelle Philip Terpsma

Cédric Gonnet

Robert Martinus Marie Cremers

Disclosed is a method of heat treating quartz glass deposition tubes at between 900&#xb0; C. and 1200&#xb0; C. for at least 115 hours. The resulting deposition tubes are useful in forming optical preforms that can yield optical fibers having reduced added loss.

Glass-tube extended-baking process

A method for manufacturing a preform for optical fibers by a vapor deposition process wherein an intermediate step is carried out between one deposition phase and the next deposition phase(s), wherein the intermediate step includes supplying an etching gas to the supply side of the hollow substrate tube.

Method for manufacturing a preform for optical fibres by means of a vapour deposition process

The present invention relates to a method for manufacturing a preform for optical fibers via a vapor deposition process in which the position of the reversal point near the substrate tube's supply side shifts along the longitudinal axis of the substrate tube during at least part of the deposition process.

Optical fiber PCVD using shifting of a deposition reversal point

Extended-baking process for glass deposition tubes

A method for manufacturing a preform for optical fibers by means of a vapor deposition process, wherein plasma conditions are created and wherein the plasma is moved back and forth along the longitudinal axis of the hollow substrate tube between a reversal point near the supply side and a reversal point near the discharge side of the hollow substrate tube, so that the location where the soot deposition associated with one phase takes place is axially spaced from the location where the soot deposition associated with the other phase(s) takes place.

Method for manufacturing a preform as well as a method for forming optical fibres from such a preform

The present invention relates to an apparatus for carrying out a PCVD deposition process, wherein one or more doped or undoped layers are coated onto the interior of a glass substrate tube, which apparatus comprises an applicator having an inner and an outer wall and a microwave guide which opens into the applicator, which applicator extends around a cylindrical axis and which is provided with a passage adjacent to the inner wall, through which the microwaves can exit, over which cylindrical axis the substrate tube can be positioned, and wherein at least one choke of annular shape having a length l and a width w is centred around the cylindrical axis within the applicator.

PCVD apparatus with a choke defined within a microwave applicator

The present invention relates to an apparatus for carrying out a plasma chemical vapor deposition process by which one or more layers of doped or undoped silica can be deposited on the interior of an elongated glass substrate tube. The present invention further relates to a method for manufacturing an optical fiber using such an apparatus.

Apparatus for effecting plasma chemical vapor deposition (PCVD)

A preform for manufacturing an optical fibre or an optical fiber, where the variation in the refractive index contrast of the preform does not exceed an absolute value of 2%, measured for a preform having a length of at least 60 cm, or the deviation of the preform in relation to the average value of the profile parameter &#x3b1; does not exceed an absolute value of 0.03, measured for a preform having a length of at least 80 cm. The optical fibre has a deviation from the average value of the profile shape parameter &#x3b1; of maximally about 0.03.

Method for the production of an optical fibre, preform, and an optical fibre

The present invention relates to a method for manufacturing an optical preform by employing an internal vapor deposition process. The method uses an energy source and a substrate tube, wherein the energy source is movable over the length of the substrate tube between a point of a reversal at the supply side and a point of a reversal at the discharge side.

Method for making an optical fiber preform via internal vapor deposition

The present invention relates to a method of manufacturing an optical fiber, which method comprises the following steps: In addition to that, the present invention relates to a preform for manufacturing an optical fiber, as well as to an optical fiber.

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Eindhoven, Netherlands

Rob Hubertus Matheus Deckers