| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a remote node by multiplexing an incoming signal light, time-divisionally demuttiplexing it into plural digitized incoming subscribed signals and converting the plural demuttiplexing digitized in coming subscriber signals back into plural original subscriber signals by a digital/analog conversion circuit. SOLUTION: An in coming signal light 70a sent from a remote node 20 is converted into a multiplexed incoming subscriber signal 410a by O/E 300, is time-divisionally demuttiplexed by DMUX 340 and is converted into the digitized incoming subscriber signals of 30 channel. A digitized incoming subscriber signal 420a from DMUX 340 is converted into an incoming subscriber signal by a digital/analog conversion circuit, is converted into a differential signal by an amplifier and is inputted to a hybrid transformer. An outgoing subscriber signal from the hybrid transformer is converted into a digitized outgoing subscriber signal 420b by an analog/digital conversion circuit. |
