Abstract: In a Wavelength Division Multiplexed (WDM) all-optical network having optical nodes linked together by optical fibers carrying communication channels of separate wave-lengths, a method is applied in order to extend the size of the all-optical network. According to the method, a model is set up for the all-optical network in which a wavelength graph containing vertices and edges represents the physical effects of the nodes and links. After identifying a set of demand, an objective function is calculated expressing the total routing cost and total signal power demand of the channels. The minimum of the objective function returns the signal powers for each channel to be tuned.

Abstract: In a Wavelength Division Multiplexed (WDM) all-optical network having optical nodes linked together by optical fibers carrying communication channels of separate wave-lengths, a method is applied in order to extend the size of the all-optical network. According to the method, a model is set up for the all-optical network in which a wavelength graph containing vertices and edges represents the physical effects of the nodes and links. After identifying a set of demand, an objective function is calculated expressing the total routing cost and total signal power demand of the channels. The minimum of the objective function returns the signal powers for each channel to be tuned.

Abstract: Method for forming the virtual topology of an ATM-layer where the ATM-layer is carried over an optical network, where inputs such as the physical topology and constraints of physical nature are given, thereafter forming node-pairs with end-to-end connections according to some known optimal routing algorithm, and finally applying a non-deterministic mathematical approach to obtain an optimal virtual topology with the objective of minimising the need for necessary electrical processing in the nodes of the network.

Abstract: Method for forming the virtual topology of an ATM-layer where the ATM-layer is carried over an optical network, where inputs such as the physical topology and constraints of physical nature are given, thereafter forming node-pairs with end-to-end connections according to some known optimal routing algorithm, and finally applying a non-deterministic mathematical approach to obtain an optimal virtual topology with the objective of minimising the need for necessary electrical processing in the nodes of the network.

Abstract: The invention concerns a method for producing a telecommunication network, comprising the steps of determining geographical locations of exchange nodes and equivalent distances between these, and traffic capacities between node pairs based on the expected traffic volume between the respective nodes. The node pairs are at first sorted such that an expression S for each node pair is non-decreasing, S being a strictly monotonic increasing function of the equivalent distance and a strictly monotonic decreasing function of the traffic capacity between the nodes of the pair. For each node pair in this order, then a path P is selected for implementation among all possible paths, which path P satisfies the condition that (I) is minimum.