| http://www.w3.org/ns/prov#value | - Here, when there is a fault in an optical fiber connecting the B/R band coupler C1 to the cyclic AWG R1 or at an optical fiber connecting the B/R band coupler R1 to the 1???2 optical switch, optical signals are inputted/outputted thereto/therefrom through the B/R band couplers C2 and R2 as the B/R band coupler R2 is connected to the 1???2 optical switch, and when there is a fault in an optical fib
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