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US 6,587,633 B2Granted
Active optical fibre doped with rare earth elements
AssigneeCorning O.T.I., Inc.
InventorsMara Bagnasco, Giorgio Bodei, Francesco Negrisolo, Antonio Taglia
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Abstract
An active optical fiber (20) having: a silica glass cladding (4), and a glass core (2), doped with a rare earth, comprising a quantity of SiO2 of at least 50% in weight, and a quantity of an oxide XO not exceeding 40% in weight, wherein the element X is selected from the group comprising Ca, Sr, Ba and Zn.
Claims3
A method for producing an active optical fibre (20), having a core (2) and a cladding (4), comprising the steps of
- a) 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).
4 more elements
Dependencies are inferred from the claim text.