Fabrication and optical characterisation of doped germanosilicate fibres

Abstract

This work assesses the incorporation of dopant ions such as Al³⁺, Ga³⁺, Zr⁴⁺, Nb⁵⁺, Ta⁵⁺ and Er³⁺ into the core of germanosilicate optical fibres via modified-chemical-vapour deposition plus solution doping fabrication techniques. We find that highly-charged smaller ions, like Al³⁺ and Ta⁵⁺, behave similarly. These ions are more efficiently incorporated, assist in the incorporation of Er³⁺, and have the same influence on the fluorescence spectra of Er³⁺. The structural role of these ions appear to be their ability to provide nonbridging oxygens around Er³⁺. The waveguide and lasing characteristics of Er³⁺ codoped with Ta⁵⁺ are presented.

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