We investigate self‐induced transparency soliton switching in a nonlinear two‐level resonant dual‐waveguide directional coupler. The soliton transfer properties of the coupler depend on the input pulse area; for areas larger than &pgr;, an integer number of 2&pgr; solitons is transmitted from the output ports. Tapered coupling provides digital transmission characteristics. A specific example of application to impurity bound excitons in semiconductors is discussed.