| 摘要 |
A loop-type dataway system of the invention has a plurality of data transmission stations connected in a loop in a single optical transmission line. Each station has first and second optical directional couplers, an optical receiver, a gate circuit and an optical transmitter. The first optical directional coupler distributes the light signal received from the optical transmission line into two directions, i.e., to the second optical directional coupler and the optical receiver. The optical receiver photoelectrically converts the output signal distributed from the first optical direction coupler. The gate circuit couples the output signal from the optical receiver and an intra-office send signal. The optical transmitter photoelectrically converts the output signal from the gate circuit and supplies the output signal thereof to the second optical directional coupler. The second optical directional coupler couples the output light signal from the optical transmitter and the output light signal distributed from the first optical directional coupler so as to send the coupled signal to the next stage through the optical transmission line.
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