Patent ID: 7925163
Filing Date: 2011-04-12
Classification: H04J,H04Q

Abstract:
1. A method for assigning colors to wavelength demands for transmitting multiple optical signals in an optical network between originating nodes and terminating nodes, the optical network comprising the originating nodes, the terminating nodes and a plurality of intermediate nodes interconnected by a plurality of links, the plurality of links each being capable of transmitting a respective predetermined maximum number of separate optical signals using separate colors, the method comprising: formulating a mathematical model representing the optical network and the wavelength demands; minimizing an objective function of the model, the objective function representing a total cost of the optical network as a function of an assignment of the colors, the objective function including a sum of at least the following quantities: assigning the colors to the wavelength demands and identifying one or more of the intermediate nodes for color changeovers whereby the objective function is minimized.