The fabrication of narrowband highly reflecting filters in single-mode step-index fibers was reported recently by Hill et al. [
Appl. Phys. Lett. 32,
1978)]. The underlying effect on which these filters are based is a photoinduced refractive-index change in the GeO2 used as a core dopant SiO2 fibers. A study is reported aimed at the characterization of such optical fiber filters. A theoretical model is developed, and relevant fiber parameters are determined through intercomparison with experiment. In this way, both the magnitude of the photoinduced index change and its dependence on the writing power coupled into the fiber are determined.
© 1981 Optical Society of America
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