Dynamic spectrum allocation in orthogonal frequencydivision multiplexing optical networks

Orthogonal frequency-division multiplexing has emerged as a technology that can meet the requirements of diverse, bandwidth-intensive applications envisioned in future optical networks. in orthogonal frequency-division multiplexing optical networks, multiple subcarriers can be allocated to accommodate both subwavelength and superwavelength traffic. an important factor in the success of orthogonal frequency-division multiplexing is routing and spectrum allocation. in this paper, we propose two spectrum allocation algorithms for dynamic orthogonal frequencydivision multiplexing optical-based networks: first-fit spectrum allocation starting from the spectrum boundary and spectrum partitioning. in spectrum partitioning, the spectrum is divided into multiple sectors, in which a subset of relative call type sizes compete for the subcarriers in opposite directions. we present simulation results to show the efficiency of our new algorithms.