Allocation of spectral capacity in a wavelength-division multiplexing optical network

摘要

A method for allocating spectral capacity in a WDM optical network comprising: —providing (4) a group of connection demands, —defining a group of candidate lightpaths that are adapted to carry an optical signal transparently, —defining a highest admissible spectral efficiency for each candidate lightpath, —computing (6) a respective spatial path for each connection demands, —for each candidate lightpath, determining the connection demands that match the candidate lightpath and computing its (1 2) spectral resource saving as a function of the difference between the spectral resources that would be used with its highest admissible spectral efficiency and the spectral resources that would be used with its reference spectral efficiency for the total capacity of the matching connection demands, —selecting (14) and allocating spectral resources to the candidate lightpath having the highest admissible spectral resource saving, —removing (14) the selected candidate lightpath and iterating to the step of determining the matching connection demands.

主权项

1. A method for allocating spectral capacity in an optical network comprising the steps of:
receiving a connection demand specifying a source node, a destination node and a capacity; routing the connection demand to define a set of links connecting the source node and the destination node; adding the connection demand to a connection demand list associated with each link in the set of links; determining a set of candidate lightpaths, where each candidate lightpath provides connectivity over one or more links belonging to the set of links; determining a set of connection demand matching lightpaths by selecting candidate lightpaths providing connectivity over an unallocated subpath, the unallocated subpath having one or more links where each link has the connection demand in the connection demand list; determining a spectral resource saving for each connection demand matching lightpath; allocating a subpath by selecting a connection demand matching lightpath based on spectral resource saving and by deleting the connection demand from the connection demand list of each link having connectivity provided by the selected connection demand matching lightpath; and if another unallocated subpath remains, repeating the steps of determining a set of connection demand matching lightpaths and allocating.