US 6,687,439 B1 · Light-amplifying optical fiber and method of making the same

Abstract

The present invention relates to a light-amplifying optical fiber comprising a structure for realizing a flat gain characteristic or oscillation characteristic in a wider wavelength band, and a method of making the same. The light-amplifying optical fiber according to the present invention comprises a second doped area containing a first doped area including an optical axis center and having a larger outer diameter than the first doped area. The second doped area is doped with at least one of Al2O3, P2O5, Y2O3, and B2O3 as an oxide of an element having a valence different from that of a cation constituting a main material of the light-amplifying optical fiber; whereas the first doped area is doped with at least one of Er, Nd, Tm, Yb, and Pr as a rare-earth element together with the oxide.

Claims8

Dependent claims

A light-amplifying optical fiber comprising a core region extending along a predetermined axis;

and a cladding region, provided on the outer periphery of said core region, having a lower refractive index than said core region;
wherein a first doped area with an outer diameter a which includes said predetermined axis and is substantially doped with a rare-earth element exists in a second doped area with an outer diameter b>a which contains an oxide of an element having a valence different from that of a cation constituting a main material, SiO2, of said light-amplifying fiber;
and
wherein the ratio (a/b) of the outer diameter a of said first doped area to the outer diameter b of said second doped area is 0.1 or more but 0.9 or less.

1 more element

Dependencies are inferred from the claim text.

Light-amplifying optical fiber and method of making the same

Life of this patent

Light-amplifying optical fiber and method of making the same

Life of this patent

Abstract

Claims8