| 摘要 |
PURPOSE:To distribute and collect an optical signal from each of a master set and a slave set and to send the signal in 2-way by interposing the distribution collection device between a master set group and a slave set group of optical fiber type and to attain mutual signal exchange between each master set and each slave set. CONSTITUTION:An input and an output of an OR circuit A6 being a 1st OR circuit and those of an OR circuit B6 being a 2nd OR circuit are connected each other. Thus, the same signal as that sent from each of slave sets 3, 4, 5 of a slave set group to a master set group in an optical star coupler 7 is sent to itself and to other slave sets as if the signal were reflected simultaneously, and the same signal as that sent from each of master sets 1, 2 of a master set group to the slave set group is sent to its own set and to other master sets as if the signal were reflected simultaneously. Thus, a transmission data from each of the slave sets and master sets is sent in a way of being fed back to its own set on one hand, then the self-check of the transmission data is attained to improve the reliability. |
