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Total field transformation in nonregular optical fibers

Propagation of radiation in non-regular single mode fibers is investigated. Fibers with the core diameter step and tapers are taken into consideration, as well as cylindrical fibers with the Kerr-like nonlinearity of the fiber material. Paraxial wave equation is solved numerically by the sweep method. Power flow and spot size of the field propagating along the fiber axis is calculated. Accuracy of the numerical technique is analyzed relative to the different fiber structures.