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An abruptly tapered fiber can be essentially divided into three different regions: one beating region in its central, quasi-cylindrical part, lying between two coupling regions, where the slopes are large. In this paper we report two experiments which help to visualize and analyze the beating region. We show that, in this region, there are principally two(More)
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(More)