Research reports light-induced changes in refractive index of Ge-doped fibers, indicating promising filter applications.
The observation of photosensitivity in Ge-doped core optical fibers is reported. The photosensitivity is manifested by light-induced refractive-index changes in the core of the waveguide. Narrowband reflectors in a guide structure have been fabricated using this photosensitivity and the resulting DFB reflectors employed as laser mirrors in a cw gas laser in the visible.
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Hill et al. (1978) studied this question.
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