PURPOSE: To enable the bi-directional transmission without reducing the transmission efficiency by mounting a member having a transmission line capable of branching and coupling an optical signal and inserting the light communication sent from one connection part to the connection part with is not connected with a light cable into other connection part.
CONSTITUTION: An optical signal from an equipment with a light emitting part and a light receiving part is inserted through a connection part 2 and an optical signal from the other equipment is inserted through a connection part 7, then they are coupled by a 1st connection part 8a, further they are sent through a connection part 4 to an optical cable for the transmission to the other devices. One of the optical signals inserted through a connection part 5 is sent through a connection part 1 to the light reception part of the equipment and the other is sent through a connection part 6 to the other equipment, then to a optical cable. When it is unnecessary to send it to the other equipment, the optical signal is inserted through not the connection part 5 but through the connection part 3, the inserted optical signal reaches the connection part 1. Thus, the signal transmission between devices can be performed bidirectionally without washing the optical signals.
ITO SHIGEYUKI
SANO KENJI
