| 摘要 |
In a passive optical telecommunication system in which a plurality of decentralised devices are in each case connected via a dedicated optical waveguide connection line to an optical splitter which is connected directly or via at least one further optical splitter to a common optical waveguide connection of the central device via an optical waveguide bus, decentralised devices and a central device transmitting or receiving optical digital signals using the duplex-channel method, to avoid impairment of the receive sensitivity of the central device corresponding to the bit pattern of its transmit signal, the emitter/receiver circuit in the decentralised devices is in each case designed in such a way that the output of the opto-electrical transducer is connected via an electrical received signal invertor to the input of the electro-optical transducer, and an optical delay line, whose delay time is synchronised with the working time of the electrical received signal invertor, is inserted between the output of the electro-optical transducer and the optical waveguide connection line. <IMAGE>
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