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Beam-propagation analysis of magneto-optic waveguide couplers

Due to their nonreciprocal properties integrated magnetooptical structures are of large interest for optical communication systems. The paper presents a finite-difference beam-propagation algorithm for the numerical analysis of such structures. It is applied to the simulation of nonreciprocal interferometers and couplers. Conclusions are drawn with respect to the experimental realization of integrated optical isolators and circulators.