| 摘要 |
PURPOSE:To control a receiving part by an electric signal from a photodetecting element, in the controlling part, by converting electric signal from plural devices installed on the job site into optical signal by an equipment part on the job site, also split them to each wave length by an optical branching filter, transmit it to a controlling part. CONSTITUTION:In the equipment part L on the job site, signals CH11-CH1n, CH21-CH2n depending on the apparatus state from the devices AC, BC installed on the job site are input as electric signals from the transmission part 1 to the light emission source 2, and they are converted to optical signals by the light emission source 2. This optical signal is input to the optical branching filter 4 through the optical fiber 3. And, it is transmitted to the control unit part CP through the optical fiber 31. This optical signal inputs and adds the same circuit information as the same wave length by the optical branching element 6 through the repeating amplifier 5, splits it again to each wave length by the optical branching filter 41, and after that, converts the optical signal into an electric signal by the photodetecting element 7, transmits it to the receiving part 8 to obtain the necessary information. |
