The method of enhancement of local amplitude sensitivity of optical fibers by means of creation of special fiber's <> is developed. The amplitude modulation of guided light at deformation of such <> is investigated. The <> optimal size and shape providing maximal efficiency and linearity of transformation of external actions into amplitude-modulated optical signal are defined. It is shown, that such elements are perspective for seismic sensors development, because they enhance sensor's sensitivity on 59dB.
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