J-fiber Gmbh

J-plasma Gmbh

Pilkington Group Limited

Matthias Auth

Lothar Brehm

Wolfgang Hämmerle

Jörg Kötzing

Thomas Gutsche

Elke Poppotz

Hans Engler

Guido Siebert

Helga Grünzel

Frank Körbel

Andreas Poersch

Elke Poppitz

Methods for producing a semifinished part for the manufacture of an optical fiber are disclosed. The methods are optimized in terms of bending. The methods include the steps of providing a shell tube with a shell refractive index which is lower in relation to the light-conducting core. Then, at least one protective, intermediate and/or barrier layer is applied to a radially outermost and/or innermost tube surface of the respective shell tube, wherein a build-up of light-conducting layers is realized on the inner side and/or the outer side of the shell tube. Finally, the shell tubes are joined by collapsing so as to form the semifinished part.

Methods for producing a semifinished part for the manufacture of an optical fiber which is optimized in terms of bending

The invention relates to an optical fiber, in particular a laser fiber, containing a doped glass fiber core () and cladding () around the latter with a refraction index profile which decreases outwards from the fiber core. The optical fiber is distinguished by at least one intermediate layer () being disposed between the glass fiber core and the cladding to reduce the mechanical tension therebetween. In one advantageous embodiment, the intermediate layer is doped in such a way as to ensure a stepped mechanical tension distribution between the glass fiber core and the cladding, and is co-doped in such a way as to reduce the refractive index and counteract the refraction index-increasing effect of the intermediate layer doping. The invention further relates to an application of at least one doped barrier layer to a core region during preparation of the preform to avoid diffusion of special core dopants from the core during the collapse process, and to allow the diffusion of special dopants between the barrier layer and the core layer.

Optical fiber, in particular a laser fiber containing a doped glass fiber core and cladding around the fiberglass core

A method for producing a glass fiber, through longitudinally drawing a preform in a drawing kiln, wherein cooling the glass fiber is performed in at least three time periods, wherein the glass fiber is exposed to a first time based cooling rate above a crystallization temperature range, to a second time based cooling rate that is greater than the first time based cooling rate within the crystallization temperature range, and to a third time based cooling rate which is smaller than the second time based cooling rate below the crystallization temperature range.

Method for producing a glass fiber and device

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Essen, Germany

Matthias Auth