used as a transmitter and a photo diode 24 pd used as a receiver are arranged on a common submount 1 between these two components the submount 1 has a back 25 which optically shields the two components against each other an optical waveguide common to the two electronic components 2 and 24 is held in a coupling element 3 the submount has two slots 6 for receiving the bond wires 5 leading from the components 2 and 24 to the printed circuit board not shown the back 25 at the same time serves for supporting the optical waveguide in the predetermined distance from the components 2 and 24 and therefore takes over the function that is provided by the shoulder 8 in the other embodiments it is advantageous compared to the prior art that the diodes 2 and 24 have no electric interaction since the current of the transmission diode does not have to flow through the chip of the receiver diode an exemplary embodiment suitable for high precision demands is shown in fig1 in the longitudinal section in which the coupling element 3 is provided on the one side first of all with a blind hole which is later.