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.