Open fiber control and loss of light propagation in time division multiplexed inter-system channel link

[Subject] A propagation method of opening fiber control in a channel link between time multiplexing systems and an optical loss is provided. [Means for Solution] Each of an input channel is provided with the following in a method and a device which transmit a signal from a plurality of input channels on a TDM optical network. An optical data signal, An electric control signal including control information about an optical data signal. According to the present invention, an optical data signal is changed into each electric data signal, a TDM data multiplexer carries out time multiplexing of them, and each optical receiver generates a multiplexing data signal. A TDM control signal multiplexer carries out time multiplexing of the electric control signal, and generates a multiplexing control signal for generating a compound electricity signal in combination with the multiplexing data signal. An optical transmitter generates a compound light signal from a compound electricity signal, and after WDM multiplexes this with other compound light signals optionally, it is transmitted on a network. Corresponding twist operations are performed at an end of a receiving side, and original data and a control signal are reproduced. [Chosen drawing] Drawing 3