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The Role of the Longitudinal Component of Electric Field for Evanescent Fiber-Optic Sensors

The role of the longitudinal electric field component in the evanescent fiber sensors is studied. Numerical methods are used to calculate the power transmission coefficient of two parallel optical fibers with taking into account the longitudinal component of the field. The dependence of the power transfer coefficient of two parallel optical fibers on the coupling length is obtained. It is demonstrated that the contribution of the longitudinal component of the field is significant for the calculation of evanescent sensors based on two optical fibers.