Abstract: A manufacturing method for erbium doped silica, having a soot formation process, in which a silica glass soot is deposited on a seed rod for forming a soot preform in a porous state on the seed rod, a dopant impregnation process, wherein the soot preform is impregnated with at least an erbium compound, and a preform formation process, wherein this soot preform impregnated with a dopant is heated and rendered transparent. The dopant impregnation process is provided with an operation in which the soot preform obtained in the soot formation process is dipped in a solution containing an erbium compound, an aluminum compound, and a phosphorus compound; this is then desiccated, and soot preform which is impregnated with the erbium compound, the aluminum compound, and the phosphorus compound is obtained.

Abstract: A deposition method for vapor deposition of a film of fluorine-containing glass on a substrate in which said substrate is put into contact with fluxs of the vapors of the various constituents of said glass, wherein said vapor fluxs are emitted simultaneously from at least two crucibles, a first crucible containing a host bath and main metal fluorides that constitute said fluorine-containing glass, and at least one second crucible containing dopants constituted by at least one rare earth halide.

Abstract: In order to fabricate strip monomode active optical waveguides for optical elecommunications, a layer of vitreous soot is deposited on a substrate and is impregnated with a solution of a precursor of a rare-earth dopant, and a radiation with a wavelength comprised in an absorption band of the dopant is moved along the soot, along a trajectory corresponding to the geometrical shape desired for the guide, thereby forming a vitrified strip.