The problem of energy losses of the optical radiation in such a system is considered. As the input and output of system of the single-mode optical fiber is used. The equations defining the minimum possible level of energy losses caused by the diffraction of beam is obtained. The analysis showed that the losses depend explicitly on several parameters: the radiation wavelength, the distance between the end of fiber and the aperture, and the ratio of the diameter of fiber and lens aperture. With the help of computer simulation in Matlab system the losses depending on the parameters mentioned above is presented.
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Vasily I. Kazakov, "Optical wave beam propagation in two-lens scheme with arbitrary parameters," Proc. SPIE 9889, Optical Modelling and Design IV, 98891C (27 April 2016);