In summary significant photorefrativity has been achieved in pure SnO{sub}2:SiO{sub}2 optical fibres, even at very low concentration of SnO{sub}2. A comparison with GeO{sub}2:SiO{sub}2 is presented and it shows two-orders of magnitude greater photosensitivity (in terms of dopant concentration needed to produce the same refractive index modulation). Future work should lead to a better understanding of how Sn enhances the photosensitivity, fibres with greater Sn concentrations and thus higher index modulations. It is hoped that this research will lead to the production of highly photosensitive optical fibres with low loss at 1.5 μm and compatible with standard telecom fibre (same NA).
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