Abstract: This invention relates to an improved optical communication system having an enhanced wide-core single-mode planar waveguide for transmitting a single-mode light wave in a unique manner. The system is generally made up of light-wave source means, the aforementioned waveguide and receiving means. The waveguide is generally made up of an inhomogeneous wide-core means of block-like configuration and opposed cladding means where one set of opposed sides of the waveguide are provided with the cladding means. The cladding means has a constant permittivity. The core means has an inhomogeneous permittivity profile, a part of which is greater than the cladding means permittivity and another part of which is less than the cladding means permittivity. The analogy of quantum mechanics with optics can provide an algorithm for an equivalent inhomogeneous quantum potential formula of curvilinear shape.