Abstract： In order to overcome the long-time routing and high traffic blocking in complex multidomain optical networks, a path computation strategy was proposed based on the least square. First, the multidomain networks were abstracted into a low complex virtual topology through single node topology convergence. Then the more than one domain sequences from source node to destination node were calculated using the minimum number of hops. Secondly, based on the least square method, these domain sequences were fitted to some different centre points by jointly considering multiple inter-domain resources. Furthermore, the optimal centre point, that is the optimal domain sequence, was selected using the weighting formula. Finally, the route was computed according to the selected domain sequence. Simulation results indicate that the proposed strategy not only ensures a shorter path computation time but also reduces the traffic blocking effectively.
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