| 摘要 |
PROBLEM TO BE SOLVED: To realize the wavelength multiplex optical network system with high reliability at a low cost. SOLUTION: In this system, network elements 101a-101d are configured by optical fibers 103a-103h. The network element 101a is provided with means 102a1 , 102a2 ,...102ad-1 , 102an that send/receive optical signals with wavelength bands of λ1 , Aλ2 ,...Aλn-1 , λn , The optical signals are sent counter clockwise by the optical fibers 103a-103d and are sent clockwise by the optical fibers 103e-103h. The wavelength bands λ1 -λn are different from each other, and the wavelength bands of λ1 , λ2 ,...λn-1 are used for operating system wavelength bands and the wavelength band λn is assigned to a standby wavelength, and on the occurrence of a fault in any of the wavelength bands λ1 , Aλ2 ,...λn-1 , the wavelength is replaced with the wavelength λn . |
