H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/12 (2006.01) H04B 10/00 (2006.01)
Patent
CA 2125692
An optical line switching system in which a first station 1 and a second station 5, each of which has a signal transmitter 2, 6 for transmitting optical signals to be sent and a signal receiver 3, 7 for receiving optical signals sent from the signal transmitter, are connected to each other by at least two sets of optical transmission line pairs 10 and 20, each set of which comprises an optical line 10a, 20a and a standby optical bypath line 10b, 20b and is provided with first optical switchs 11, 21 and second optical switchs 12, 22 at each end, so that the optical signals transmitted through each optical transmission line pair is switched from the optical line to the standby optical bypath line by the first and second optical switches provided in each optical transmission line pair. Each optical transmission line pair 10, 20 is provided first control device 30 and second control device 35 on the side of the first and second stations, which device detects optical signal, and switch over the first and second optical switches connected to the two sets of optical transmission line pairs on the side of the signal receiver in accordance with the light level of detected optical signal.
Hattori Nobuhiko
Iwatate Kazuo
Watanabe Kazunori
Yamashita Tetsuhiro
Smart & Biggar
The Furukawa Electric Co. Ltd.
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