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The elastic optical networking has become a promising solution of allocating continuous frequency slots according to spectrum demand. A provident spectrum defragmentation is presented through virtual concatenation, and it outperforms conventional push-pull methods by simulations.

We present a multi-flow virtual concatenation model in flexible spectrum networks. A split-multi-flow RSA algorithm (SMF) triggered by path cascading degree is proposed based on the model. Simulation results show SMF can get better performance.

Existing studies on the CO-OFDM optical networks are mostly based on the assumption that all the sub-bands of a lightpath are continuous in spectrum and transmitted on the same route. For better network capacity utilization, we apply Virtual Concatenation (VCAT) technique to the frequency domain by transmitting the sub-bands of a CO-OFDM optical channel via different routes. Simulation results show that the VCAT technique can significantly improve lightpath blocking performance and the improvement is more significant under a smaller VCAT sub-band granularity.

We propose a simplified framework that exploits grooming and virtual concatenation to minimize the optical transport network cost for supporting 40Gb/s and 100Gb/s services. The impact of transceiver cost and maximum optical reach is assessed.