Basic characterization of optical fibers

In the present contribution we remind some of the basic information that can be obtained on silica glass employing radiation induced attenuation, electron paramagnetic resonance and photoluminescence spectroscopies. In details, it is shown how each of these techniques, can support the characterization, the qualification and the study of the glasses. Such multi-experimental approach has proved to be useful in previous cases and as a consequence still represents a fundamental tool for optical fibers investigation that cannot be neglected.