| 摘要 |
The invention concerns a method and a device for protecting a centralised WDM optical ring network transporting data flow in connected mode, the network comprising a main optical fibre for one-way data transmission in the form of an optical signal and a protective optical fibre which connect a central node (SO) and secondary nodes (S1 SN). The method consists in controlling the optical switches to switch the main optical fibre to the protective optical fibre in the event of route rupture, in accordance with a control protocol whereby an upstream optical switch and a downstream optical switch of each specific node (Si) are controlled on the basis of a first information (Po) on the state of optical support and second data (VPi/i; VPi/i+1; VP N/O) concerning the state of the logic connections between specific nodes of the network.
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