Multicast RWA method with signal power attenuation limit in all-optical network

Abstract

The invention provides a multicast RWA method with signal power attenuation limit in an all-optical network, which is applied to the ranges of an all-optical metropolitan area network and other medium-scale all-optical networks. The method solves the problems of route selection and wavelength distribution in the all-optical network. The method comprises the following steps: updating a logical topology on each wavelength of the network in real time by a node; when a multicast request reaches, selecting the logical topology of one wavelength according to a determined sequence to establish a multicast tree; preferentially adding the node close to a source node as the basic principle of establishing the multicast tree; and for a destination node which cannot be added into the multicast tree, exchanging the wavelength to establish another multicast tree. The method has the main characteristics that temporary power and minimum power limits of a signal on each edge link are considered when the multicast tree is established, and only the link of which power is more than the power limit can be added into the multicast tree. Therefore, the method ensures that the signal power reaching the destination node meets the lowest power requirement, and reduces error rate.

Description

technical field [0001] The invention belongs to the technical field of multicast routing selection and wavelength distribution in an all-optical network, and is especially suitable for an all-optical network where the network scale is not too large and the connections between nodes are relatively dense, such as an all-optical metropolitan area network. Background technique [0002] Multicast technology in optical networks generally focuses on minimizing the cost of multicast communication: multicast communication needs to find a multicast forest that can connect source nodes and all destination nodes in the entire network (in special cases, there is only one multicast forest in the multicast forest). tree, figure 2 Give an example), this multicast forest is composed of many links, using each link will generate a certain cost, then the sum of link costs is the cost of multicast communication, the purpose of the designer is to make This costs the least. This problem is a Ste...

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Problems solved by technology

However, because the splitter with adjustable splitting ratio is relatively expensive and the technology is not very mature, this method is very difficult to realize

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