Routing and wavelength assignment for establishing dependable connections in WDM networks

The problem of establishing dependable connections (D-connections) for fast failure recovery in wavelength-routed wavelength-division multiplexed (WDM) networks with dynamic traffic demand is addressed. Focus is on backup multiplexing based primary-backup lightpath routing in WDM networks. Different methods are presented to assign wavelengths to backup lightpaths, for a given primary lightpath. All the given methods differ in their computational complexity and performance. A method called backup threshold is proposed to improve fairness among the connections with and without fault-tolerant requirements.