Optical fiber draw furnace having a SiC or Silicon Nitride tube
AssigneeAlcatel
InventorsJurgen Berndt, Michael Hoffart, Norbert Nowack
Life of this patent
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Abstract
An apparatus for drawing a fiber (11), particularly an optical glass fiber, from a heated preform (9), has a tubular heating element (1), which encloses preform (9) at least partly in its longitudinal direction, and an induction coil (4) surrounding tubular heating element (1) at a radial distance. Along an inside surface (19) of the tubular heating element (1) a protective tube (20) is provided, which surrounds fiber (11) and preform (9) at a radial distance. Protective tube (20) reliably prevents burning off of the heating element and thus a deterioration of the properties of the fiber (11).
Claims6
An apparatus for drawing a fiber (11), particularly an optical glass fiber, from a heated preform (9), said apparatus including a tubular heating element (1) which encloses preform (9) at least partly in its longitudinal direction, and an induction coil (4) surrounding the tubular heating element (1) at a radial distance, said apparatus further comprising a protective tube (20) along an inside surface (19) of the tubular heating element (1), said protective tube (20) surrounding fiber (11) and preform (9) at a radial distance, wherein
- the entire protective tube (20) is made of silicon carbide.
An apparatus for drawing a fiber (11), particularly an optical glass fiber, from a heated preform (9), said apparatus including a tubular heating element (1) which encloses preform (9) at least partly in its longitudinal direction, and an induction coil (4) surrounding the tubular heating element (1) at a radial distance, said apparatus further comprising a protective tube (20) along an inside surface (19) of the tubular heating element (1), said protective tube (20) surrounding fiber (11) and preform (9) at a radial distance, wherein
- the entire protective tube (20) is made of silicon nitride.
Dependencies are inferred from the claim text.