Flexi-grid networks with orthogonal frequency-division multiplexing has recently been proposed in optical networks, which can provide flexible capacity granularity. We investigate the network performance under dynamic subcarrier allocation methods. The performance measurements, including blocking probability and average link efficiency, are considered by simulations. The results demonstrate the performance profiles of three scenarios, and show that the performance of the network with first fit method is better than that with next fit one in a single fiber link; the traffic requests in one conn...
