[Bragg reflector induced photosensitivity in an optical fiber: growth pattern and frequency response]

A theoretical model has been developed which describes the growth of a photo-induced Bragg filter in a single-mode optical fiber. This model is derived from the coupled wave theory and takes into account Fresnel reflections at both ends of the fiber. The frequency response of the filter is the result of the combined effect of both the distributed and localized reflections. It has been calculated at various instants of the growth process and for various phase conditions at the Fabry-Perot fiber interferometer.