| 摘要 |
PURPOSE:To attain the use of only one folding signal line in folding an optical signal to a terminal station by providing a folding circuit to fold the optical signal received from an input terminal while being converted into an electric signal in a two-way optical repeater, and transmit the signal from an output terminal. CONSTITUTION:The two-way optical repeater 6 leads a transmission signal of a regenerative circuit 23 of the 1st relay circuit to an input terminal of an equalizing amplifier circuit 12 of the 2nd relay circuit via a switching circuit 15 and the optical signal received from the input terminal R1 is transmitted from an output terminal S2 while being folded as the electric signal. When a control signal represents the absence of folding operation command in this case, input and output terminals of the switching circuit 15 are interrupted and the two-way optical repeater 6 conducts the two-way relay operation. Further, when the control signal represents the presence of indication of folding operation, the input and output terminals of the switching circuit 15 are made conductive at least as to the AC component, and the repeater 6 conducts the folding operation. |
