Active optical fibre doped with rare earth elements

摘要

An active optical fiber (20) having:a silica glass cladding (4), anda 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.