Lichtwellenleiter-Übertragungsnetz mit Frequenzmultiplexierung

The network uses monomode reception (101) and transmission (102) optical fibres connecting terminals via a star-configured coupler. A local oscillator (106) is provided in each terminal (100) in order to effect heterodyne reception. In respect of exchanges of messages over a frequency channel, the frequencies of the transmitters (105, 205) of the relevant terminals, and those of their local oscillators (106, 206), are adjusted locally, on the basis of the frequencies of adjacent channels occupied by other exchanges of messages, or, on default on the basis of a base frequency emitted by a common generator. For this purpose these terminals perform a frequency incrementation by virtue of a frequency scanning and a clock (125) and filters (120, 122, 125) making it possible to locate an available channel. The invention applies to telecommunications.