PROJECT TITLE :

Dispersion-Adaptive First–Last Fit Spectrum Allocation Scheme for Elastic Optical Networks

ABSTRACT:

The standard-of-transmission (QoT) degradation because of the dispersion result in longer lightpaths is on top of that of shorter lightpaths in a dispersion uncompensated network. To overcome this shortcoming, this letter proposes a dispersion-adaptive 1st-last match spectrum allocation scheme for elastic optical networks to decrease the decision blocking in the network. The proposed theme assigns longer lightpath requests from the tiniest indexed spectrum slot, where the dispersion impact is less, and shorter lightpath requests from the largest indexed spectrum slot, where the dispersion effect is a lot of. Thence, a less robust modulation technique is employed to maintain the QoT threshold level for the longer lightpath requests, and hence a lower variety of spectrum slots are needed for lightpath institution. Simulation results show that the proposed theme outperforms the traditional theme in terms of blocking chance and contiguous aligned accessible slot ratio.