A stereo receiver of a simple structure is disclosed capable of continuously controlling the degree of separation of left and right voice signals in accordance with the level of electric field strength. A Ge wafer having a cleaving plane defined by ion implantation is provided. In one embodiment, the transceiver hub comprises an optical source, an asymmetrical lens such as a cylindrical lens, and a diffraction element such as a diffractive phase plate. In order to reduce the leakage current, the step discontinuities are back-filled with an insulating material, such as silicon nitride, forming a flat surface relative to the source and drain regions, to enable to the gate metal to lay flat.