Abstract: Optoelectronic active/passive components (15) are directly mounted to a front surface of a capsule (1) of an electrically isolating, opaque material. The surface on which the components (15) are mounted is retracted in relation to other parts of the front surface where holes (11) for guide pins of a connectable coupling device (7) for optical fibers are provided. The components (15) are electrically connected to, e.g. by means of loose wires, conductor paths (17) also arranged on the retracted front surface part. In a particular designed mounting method the optical components may be provided in the shape of a plate having its electric terminals at its rear side. On the electric terminals isles, e.g. of tin solder, are placed, the plate is placed at the front side of the capsule, where holes are provided extending into the capsule up to electric conductive paths inside the capsule, and the soldering isles are heated so that the tin solder flows into the holes and contacts the electric conductors therein.