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The propagation of light in optical fiber one can describe with following methods: phase, propagation of bundle and optics of rays. At present, the foundation in model of ray optic take that ray is the flat wave with small field of intersection. This is well known, according to talked over model, that in optical fibers the following rays propagate: ballistic, meridional and skew. The presented work shows from mathematical side the description of ray propagation in optical fibers and the proposal of statistical measure of skew and meridional radiance share. For the visualization of this the close field distribution of light intensity is useful. Turns out, that for large shares of skew rays close field distribution is homogeneous and its shape alters in sense of normal distribution from growing shares of meridional radiance.

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The work is related to the design of vibration sensor' s head represented by MOEMS structure. The head consists of two optical fibers and micro beam that lays between them. The principle of operation of the head is free space light modulation by micro beam. The elaborated head model enables analysis of influence of head and stimulation parameters on measured output light. The main parameters of the head are material used for micro beam fabrication and beam dimensions. The micro beam can be fabricated monolithically or as added component so it can be made from silicon or glass. The micro beam types qualify the sensor type as amplitude or frequency transformer. These head types require different types of detection block. What is interesting, technologically simpler frequency transformer requires more complex detection device than amplitude transformer.