Patent ID: 7185517
Filing Date: 2007-03-06
Classification: C03B

Abstract:
1. A double crucible for drawing a core-clad glass fiber, said core-clad glass fiber comprising a glass core with at least one glass cladding, said double crucible comprising a heatable outer crucible for holding a cladding glass melt; an inner crucible surrounded by the outer crucible, said inner crucible being heatable separately from the outer crucible in order to hold a core glass melt; and wherein the outer crucible has an outlet nozzle, the inner crucible has an outlet nozzle, the outlet nozzle at the inner crucible projects or extends beyond the outlet nozzle of the outer crucible; so that the core-clad glass fiber can be drawn from the core glass melt in the inner crucible and the cladding glass melt in the outer crucible.