Patent ID: 6587633
Filing Date: 2003-07-01
Classification: C03C,H01S

Abstract:
A method for producing an active optical fibre (20), having a core (2) and a cladding (4), comprising the steps ofa) arranging a tubular support of silica glass; b) laying inside said tubular support a glass powder comprising a quantity of SiO2 of at least 50% in weight; c) immersing the glass powder in a solution comprising a solvent and a salt of a rare earth element; d) making the solvent evaporate; e) heating the tubular support so as to sinter the glass powder; f) making the tubular support collapse so as to obtain a preform; g) drawing said preform so as to obtain the active optical fibre (20) characterised in that at step c), said solution also comprises a salt of an element X2+, wherein X is selected from the group comprising Ca, Sr, Ba and Zn, in such quantity as to obtain a quantity of an oxide XO not exceeding 40% in weight in the core (2) of the active optical fibre (20).