Nonlinear couplers composed of two different saturable nonlinear cores are examined. By combining one self-focusing core appositely with another core of different nonlinearity, which can be self-focusing, linear, or self-defocusing, the detrimental effect of nonlinear saturation on the coupler formed is greatly reduced compared with that on the conventional coupler composed of two identical self-focusing cores. This finding provides a way of relaxing the practical limitation to operational power of a saturable nonlinear coupler especially when high nonlinearity is involved for low-power operation.
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Atai et al. (1992) studied this question.
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