Optical waveguide device with two predetermined wavelength, polarization independent, directional coupler switches

DETAILED DESCRIPTION Accordingly, it is an object of the invention to provide an optical waveguide device in which optical signals having different wavelengths are switched selectively at low cost.
According to a feature of the invention, an optical waveguide device comprises: a plurality of optical directional coupler switches provided on a substrate, each of the optical directional coupler switches being provided with a pair of parallel waveguides; means for applying the voltage across the parallel waveguides; and light input and output terminals coupled to the optical directional coupler switches wherein: at least first one of the optical directional coupler switches operates independently of the polarization of light having a first predetermined wavelength by defining the width of the parallel waveguides and a distance therebetween to be first predetermined values, and at least second one of the optical directional coupler switches operates independently of the polarization of light having a second predetermined wavelength by defining the width of the parallel waveguides and a distance therebetween to be second predetermined values, the parallel waveguides of the first and second ones of the optical directional coupler switches being provided by diffusing films of the same thickness deposited in a predetermined pattern on the substrate thereinto by a predetermined diffusing condition.