Routing method for dynamic wdm optical networks with wavelength continuity restrictions

A routing method for a dynamic wavelength division multiplexing (WDM) optical network having wavelength continuity constraints, CHARACTERIZED in that the method comprises:

• obtaining, by means of a processor, the topology of said dynamic WDM optical network having wavelength continuity constraints, stored in a topology database, said dynamic WDM optical network being represented by N network nodes and L links connecting said N nodes;
• obtaining, by means of said processor, a plurality of users of said network, wherein a user of said plurality is defined as a source node, a destination node, and a traffic load associated with said user;
• obtaining, by means of said processor, a plurality of non-operational routes, said plurality of non-operational routes corresponding to said plurality of users;
• and storing said plurality of non-operational routes in a non-operational routes database, wherein said non-operational routes are stored in said non-operational routes database sorted from shorter to longer length and, for those of equal length, from lowest to highest traffic load;
• storing, in an operational routes database, the routes having length equal to 1 and removing said route from said non-operational routes database;
• calculating, by means of said processor, the cost of each link of said network using the information from said operational routes database;
• calculating, by means of said processor, a cheapest route corresponding to the user of the first non-operational route of said non-operational routes database, using the information corresponding to the cost of each link;
• storing said cheapest route in said operational routes database and removing said non-operational route corresponding to said user of said non-operational routes database;
• repeating the above two steps until there are no non-operational routes in said non-operational routes database;
• and
• transmitting information through said network using said routes stored in said operational routes database.
• wherein said processor calculates the cost of each link by the formula:
• =
• wherein is the traffic load of the link and ρ is the average traffic load of said Network.