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

摘要

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.

主权项

1. An optical fiber, comprising:
a doped glass fiber core including a core dopant; a cladding enclosing the doped glass fiber core, with a refractive index profile that decreases outwards from the fiber core; and an intermediate layer that is disposed between the doped glass fiber core and the cladding, wherein the intermediate layer is configured to reduce mechanical stresses between the doped glass fiber core and the cladding, the intermediate layer including an intermediate layer dopant, and a concentration of the intermediate layer dopant in the intermediate layer is the same as a concentration of the core dopant in the doped glass fiber core to prevent net loss of the core dopant from the doped glass fiber core due to diffusion.