| 摘要 |
PURPOSE:To decrease insertion loss per a station and to connect many stations by providing a first optical coupler to branch/connect an input/output beam connector and an optical signal and providing a second optical coupler to branch/connect plural signals. CONSTITUTION:A signal on an optical fiber trunk line 3b is branched by a coupler 5b from an optical fiber extension 4b through a beam connector 2c, further branched by the first coupler 6b and thus transmitted to a coupler 7b. It is the same with inputs from the trunk line 3b to other stations 9b-9d. In the mean time, a signal outputted from the station 9a is inputted to a concentrator 10 through a connector 8a, then coupled in a coupler 7a with a signal from a connector 8c, and thus transmitted to a coupler 6a, and further, coupled with a signal from a coupler 7c to be transmitted to a coupler 5a, then coupled with a signal on an extension 4a, and transmitted to a trunk line 3a via a connector 2b. It is the same with signal inputs from other stations 9b-9d to the trunk line 3a. |
