which drive circuit 34 when acted on electrically in an appropriate manner outputs drive pulses to the individual transducers 32 and thereby causes the latter to emit radiation a lens 36 formed on the coupling surface 10 is in each case assigned to the further transducers 32 as illustrated by the beam path 38 shown by way of example only for the transducer 32 a located in the sectional plane e radiation 39 emitted by the transducer 32 a and having a second wavelength u03bb 2 which is different from the first wavelength u03bb 1 passes via the lens 36 to a second reflecting surface 40 the second reflecting surface 40 is configured parallel to the first reflecting surface 14 and inclined at an angle of 45 u00b0 with respect to optical axes 41 of the transducers 32 and with respect to optical axes 42 of the transducers 2 or with respect to the optical axes a of the optical waveguides 22 a 22 radiation 39 emitted by the transducer 32 a passes by reflection at the surface 40 onto a rear side of the surface 14 which is transmissive for the wavelength u03bb 2 of 850 nm for example emitted by the transducer 32 a consequently the radiation passes via the lens 16 likewise into the light.