Abstract
We propose an orthogonal frequency division multiplexing (OFDM) based
optical network design focussing on minimizing the total power consumption of the
network to make the network green. OFDM is a promising technology for next-generation
optical networks to support high capacity and heterogeneity in network traffic by having
flexible bandwidth allocation per wavelength. Another paradigm for supporting traffic
heterogeneity and high bandwidth demands is mixed-line-rate (MLR) networks where
wavelengths can have discrete capacities of 10/40/100 Gbps which are single carrier
based.In this study, we compare the energy efficiency of an OFDM-based network versus a
MLR network. We formulate mixed integer linear program (MILP) models to design
energy-efficient MLR and OFDM-based networks with two scenarios: (1) with fixed average
traffic per source-destination pair of the network, and (2) with uncertainties in the
traffic that an actual network may have. For scenario (2), we employ a robust
optimization technique which is called Γ-robust optimization.Our results show
that OFDM outperforms MLR in terms of energy efficiency especially when the traffic in
the network takes random peaks in some of the links.
© 2013 IEEE
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