We study a nonlinear output coupler. The nonlinear medium is the substrate which exhibits Kerr effect. New effects are predicted, which have no equivalent in the linear case: nonexponential decay of the guided field, increase of the intensity of the output radiated field, variation of the output angle along the waveguide, strong modification of the output beam intensity distribution.
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Arlot et al. (1987) studied this question.
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