Beam propagation method study of wavelength dependent in directional coupler switch

Different coupling efficiencies experienced by different wavelengths have been observed in directional couplers by a BPM study. This behaviour continues to be observed in electro-optic directional couplers, such as LiNbO/sub 3/, when an external voltage is being applied. This property can lead to the development of a device which has the ability to manage the distribution of various optical wavelengths between 1.10 /spl mu/m and 1.55 /spl mu/m under the application of external voltages of <10 V.