Patent ID: 6961493

Claim:
An optical device comprising: a core layer defining at least one input waveguide and at least two output waveguides; a first clad layer being in contact with said core layer; a second clad layer, with said core layer being provided between said first clad layer and said second clad layer; a third clad layer with said second clad layer deposited on said third clad layer; and at least one electrode for applying a certain voltage or supplying a certain current; wherein said core layer, said first clad layer, said second clad layer and said third clad layer comprise a material with a negative refractive index variation coefficient, and said third clad layer has a refractive index smaller than that of said second clad layer, and wherein said at least one electrode is positioned such that, when voltage or current is applied thereto, light propagates through only one of said output waveguides.