Spectrum and splitter utilization efficient traffic grooming routing and spectrum assignment in elastic optical networks

Elastic optical network paradigm supports the fast growth of Internet traffic due to its highly flexible spectrum assignment and bandwidth-variable optical paths. Orthogonal frequency division multiplexing (OFDM) based elastic optical networks supports sub-wavelength and super-wavelength services directly in optical level and also accommodate different data-rate traffic. It supports high speed data transmission through multiple adjacent subcarriers which overlap with each other in frequency domain without interfering. Optical layer grooming, multicast routing and spectrum assignment in elastic optical networks are considered in this paper for traffic connections having same source and similar destination set, besides all nodes are considered as multicast capable and there is no spectrum conversion capability. The simulation results show that our proposed algorithm TG-MRSA achieves better performance (significant spectrum saving and reduced splitter count) than the existing non-grooming multicast routing and spectrum assignment algorithm.