Abstract : There is great importance of routing and wavelength assignment in wavelengths routed all optical network and provide the critical sensitivity in terms of design cost and blocking probability. For a given physical network structure and connectivity information the purpose of RWA is to find the optimal suitable path and wavelength among number of possibilities existed for individual connection so that no two paths over a same link should not have same wavelength. The complexity class of RWA problem carried the NP complete. The problem of RWA can be transformed as an optimization problem and hence can be solved efficiently using meta-heuristic approach. The proposed solution has applied the Genetic algorithm based solution approach which carried the node connectivity based cross-over and mutation strategy. To provide the better balance between exploration and exploitation, a new tournament strategy has been proposed which has the combination of tournament scores and fitness function. An objective function was designed to provide the lesser number of wavelength requirement but also minimize the number of hops in the light path to minimize the blocking probability.