An optical data-bus system for wireless signal transmission between two modules of an appliance, where the modules are each equipped with at least one transmitter and/or at least one receiver, and where the transmitter is a laser diode, and the receiver is a photo-element, with which a laser beam emitted by the laser diode is aligned. Each transmitter and/or receiver of a module is encapsulated within a metallic housing, and, in the region of the transmitter and/or of the receiver, the metallic housing provides a window made of a material, which is transparent for the laser beam. A processor, which converts electrical control signals into modulation signals, which are suitable for optical modulation, or respectively which converts optical modulation signals into electrical control signals, is provided for each module.
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