<p>An optical transmitter and receiver in which a light-emitting diode (15) is inserted as light transmitter in an opening (12) of a light receiver (13) for which a photodiode or a phototransistor is used. An optical fibre (1) for bidirectional data exchange terminates in said opening (12). In the transmitting phase of the light-emitting diode (15), the light receiver (13) operates as a monitor, whereas if light is emitted from the end (2) of the optical fibre (1), the light- emitting diode (15) does not emit light and only the light receiver (13) is in the receiving mode. <IMAGE></p>
