Switching-circuit-free point-to-point audio/data signal transmission through optical fiber

The authors describe a novel switching-circuit-free point-to-point audio/data signal transmission system established by using a sender, optical fibers, and receivers. Each of these is specified by its own address consisting of a single or multiple frequency signals. During the time of transmitting the audio/data signal from the sender to the receivers, a single or multiple frequency address signal issued together with the audio/data signal in a specific frequency domain specifies a specific receiver among the others in a manner that resembles multiple frequency radio-wave propagation in a free space. An experimental setup where the sender was connected to three receivers arranged in parallel and the audio signals were transmitted satisfactorily over the frequency range of 20 Hz to 20 kHz is discussed