Abstract
Orthogonal frequency-division multiplexing has emerged as a technology that canmeet the requirements of diverse, bandwidth-intensive applications envisionedin future optical networks. In orthogonal frequency-division multiplexing opticalnetworks, multiple subcarriers can be allocated to accommodate both subwavelengthand superwavelength traffic. An important factor in the success of orthogonalfrequency-division multiplexing is routing and spectrum allocation. In this paper,we propose two spectrum allocation algorithms for dynamic orthogonal frequencydivisionmultiplexing optical-based networks: first-fit spectrum allocation startingfrom the spectrum boundary and spectrum partitioning. In spectrum partitioning, thespectrum is divided into multiple sectors, in which a subset of relative call type sizescompete for the subcarriers in opposite directions. We present simulation results toshow the efficiency of our new algorithms.
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