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

Abstract

The invention relates to an optical fiber, in particular a laser fiber, containing a doped glass fiber core (1) and cladding (2) 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 (3, 4, 5) 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.

Description

technical field [0001] The invention relates to an optical fiber, in particular a laser fiber, according to the preamble of claim 1, which optical fiber, in particular a laser fiber, comprises a doped glass fiber core and a cladding surrounding the glass fiber core, And a method for producing an optical fiber, in particular a laser fiber, according to the preamble of claim 11, the optical fiber, in particular a laser fiber, comprising a doped glass fiber core and a surrounding glass fiber core wrapping. Background technique [0002] Optical fibers, in particular laser fibers, generally comprise a glass fiber core and at least one cladding, which serves as a pump core in the laser fiber. Furthermore, the structure is protected from environmental influences by a polymer layer. The glass fiber core and cladding consist essentially of silica chemically. In order to ensure the waveguide of the pump core, the polymer layer consists of a material whose refractive index is lower ...

AI Technical Summary

Problems solved by technology

The high ytterbium doping in the core region therefore produces such high mechanical stresses relative to the undoped cladding region that the prefabricated core or fiber core can crack during the cooling phase

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