Fast restoration in optical mesh network
First Claim
1. A wavelength division multiplexed optical network having nodes coupled by links, to enable wavelengths to be routed across the network, the nodes being arranged to carry out a restoration process to re-route one or more of the wavelengths, the restoration process having the steps of:
- sending messages between the nodes to dynamically determine possible restoration routes, and re-routing each wavelength along a chosen one of the possible restoration routes.
1 Assignment
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Accused Products
Abstract
A wavelength division multiplexed optical network has a restoration process to re-route one or more of the wavelengths, by dynamically determining possible restoration routes, and re-routing each wavelength along a chosen one of the possible restoration routes. A distributed dynamic search for restoration routes down to the optical layer, for wavelengths, gives faster and more scalable restoration than reconfiguring routing tables and enables much better utilisation of bandwidth than using predetermined restoration paths.
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Citations
23 Claims
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1. A wavelength division multiplexed optical network having nodes coupled by links, to enable wavelengths to be routed across the network, the nodes being arranged to carry out a restoration process to re-route one or more of the wavelengths, the restoration process having the steps of:
- sending messages between the nodes to dynamically determine possible restoration routes, and re-routing each wavelength along a chosen one of the possible restoration routes.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A node for use in a wavelength division multiplexed optical network having many such nodes coupled by links, to enable wavelengths to be routed across the network, the node being arranged to carry out a restoration process to re-route one or more of the wavelengths, the restoration process having the steps of:
- sending messages between the nodes to dynamically determine possible restoration routes, and re-routing each wavelength along a chosen one of the possible restoration routes.
- View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 20)
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19. A node for use in a wavelength division multiplexed optical network having many such nodes coupled by links, to enable wavelengths to be routed across the network, the node being arranged to carry out a restoration process to re-route one or more of the wavelengths, the restoration process having the steps of:
- sending messages between the nodes to dynamically determine possible restoration routes, collecting optical parameters of each possible restoration route, and re-routing each wavelength along one of the possible restoration routes, chosen on the basis of at least the collected optical parameters, and the node being arranged to cooperate with other nodes, and carry out the step of sending out the messages, or the step of making the choice between possible restoration routes.
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21. Software for use in a node of a wavelength division multiplexed optical network having many such nodes coupled by links, to enable wavelengths to be routed across the network, the software being arranged to carry out a restoration process to re-route one or more of the wavelengths, the restoration process having the steps of:
- sending messages between the nodes to dynamically determine possible restoration routes, and re-routing each wavelength along a chosen one of the possible restoration routes.
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22. A sequence of data signals on a link of a wavelength division multiplexed optical network having many nodes coupled by such links, to enable wavelengths to be routed across the network, the nodes being arranged to carry out a restoration process to re-route one or more of the wavelengths, the restoration process having the steps of:
- sending messages between the nodes to dynamically determine possible restoration routes, and re-routing each wavelength along a chosen one of the possible restoration routes, the data signals comprising at least some of the messages, and signals for controlling the re-routing.
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23. A method of transmitting data over a wavelength division multiplexed optical network having many nodes coupled by links, to enable wavelengths to be routed across the network, the nodes being arranged to carry out a restoration process to re-route one or more of the wavelengths, the restoration process having the steps of:
- sending messages between the nodes to dynamically determine possible restoration routes, and re-routing each wavelength along a chosen one of the possible restoration routes, the method having the steps of using the nodes to transmit the data over an original path or, following the restoration process, over a re-routed path.
Specification