Kabel Rheydt Aktiengesellschaft

Alcatel

Michael Hoffart

Hans-Jurgen Lysson

Franz-Peter Bartling

Peter Zamzow

Helmut Haag

Jurgen Rosenkranz

Jurgen Berndt

Norbert Nowack

Rainer Broden

An apparatus for drawing a fiber ( ), particularly an optical glass fiber, from a heated preform ( ), has a tubular heating element ( ), which encloses preform ( ) at least partly in its longitudinal direction, and an induction coil ( ) surrounding tubular heating element ( ) at a radial distance. Along an inside surface ( ) of the tubular heating element ( ) a protective tube ( ) is provided, which surrounds fiber ( ) and preform ( ) at a radial distance. Protective tube ( ) reliably prevents burning off of the heating element and thus a deterioration of the properties of the fiber ( ).

Optical fiber draw furnace having a SiC or Silicon Nitride tube

Optical fiber with a color marking

To increase the identification characteristics of optical fibers (9) with one or more protective covers (10, 11) and an external color coating (12) of UV-hardened varnish, additional different color identification markings (13) are integrated into the external color coating (12).

Optical fiber with additional color markings

Growing community of inventors

Heiligenhaus, Germany

Michael Hoffart