Correlation between ultraviolet‐induced refractive index change and photoluminescence in Ge‐doped fiber

The refractive index change arising following the UV exposure of a Ge‐doped fiber was obtained by measuring the change in the far‐field width of the fiber mode in the infrared. Simultaneous measurements showed a gradual decrease in the visible photoluminescence from the fiber which can be directly correlated to the photoinduced index change.

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