An optical signal propagated through a poled-polymer input channel waveguide can be switched to a selected one of a pair of poled-polymer output channel waveguides, while producing only very low cross-talk in the unselected one of the output channel waveguides. The input and output channel waveguides are located within a non-linear optical polymer structure so that an end portion of the input channel waveguide is disposed between end portions of the two output channel waveguides. A first pair of electrodes is positioned so as to apply an electric field across one of the output channel waveguides, and a second pair of electrodes is positioned so as to apply an electric field across the other of the output channel waveguides. The first and second pairs of electrodes can be selectively energized so as to superimpose field-dependent changes upon the index of refraction in either of the output channel waveguides, thereby enabling the signal in the input channel waveguide to be resonantly coupled to either one of the output channel waveguides as desired.