METHODS AND NODE ENTITIES IN OPTICAL NETWORKS

摘要

The present invention relates to methods and node entities for distributing Physical (PI) parameters used when establishing Optical Paths for user traffic by routing and wavelength assignment of optical channels carried in optical links of a Wavelength Switched Optical Network (WSON). The object of the present invention is also to specify an object format to be introduced in a link state routing protocol, e.g. an OSPF-TE protocol,configured to carry information about physical impairments. This information set is required for the feasibility assessment of the lightpath to be established across an optical switched network controlled by a WSON Control Plane when a dynamic wavelength provisioning is considered.