<FONT face=Verdana>It have been proved that RWA (routing and wavelength assignment) algorithm in arbitrary mesh optical networks is a NP-complete problem. Previous works intended to address this problem through heuristics method or graph theory. However

the computational complexity will be increased exponentially with the network size

also

the mathematical modeling for link blocking probability is quite complicated. We propose a novel RWA algorithm that is based on the “Key Link” forecasting mechanism and jointly take the hop number and free wavelength number into account

thus

it not only addresses RWA problem from link level (setting dynamic weight)

also from network level (proactively avoiding “key links”). Results show our scheme can achieve better load balance and lower blocking ratio with low computational complexity.