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Optical Orthogonal Frequency Division Multiple Access Networking for the Future Internet

Wei Wei, Chonggang Wang, Jianjun Yu, Neda Cvijetic, and Ting Wang

Open Access Open Access

Abstract

To meet diverse, bandwidth-intensive applications envisioned in future optical networks, as well as address the shortcomings of the current Internet, novel networking technologies will be of great importance. We discuss several key issues for the future Internet, including network virtualization mechanisms, a programmable network architecture, parallelism of optical transmission, and guaranteed quality of service provisioning. Moreover, a new type of virtualized optical substrate architecture is proposed that utilizes optical orthogonal frequency division multiple access (OFDMA), along with subwavelength switching and generic packet routing to realize the network bandwidth programmability. The main features, benefits, and design and implementation challenges of optical OFDMA networking based on sliceable routers are also described. Finally, an adaptive subcarrier allocation and assignment algorithm for future OFDMA-based networking is investigated, and a performance comparison between the proposed approach and legacy time division multiple access (TDMA)-based techniques is drawn.

© 2009 Optical Society of America

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Figures (9)
Fig. 1
Fig. 1 Illustration of network virtualization supporting heterogeneous services in the future Internet.

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Fig. 2
Fig. 2 Multiplane, multilayer, and multigranularity network virtualization.

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Fig. 3
Fig. 3 Optical OFDMA-based link virtualization.

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Fig. 4
Fig. 4 Proposed sliceable router structure based on the novel packet over optical OFDMA interface.

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Fig. 5
Fig. 5 Example of an optical OFDMA network.

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Fig. 6
Fig. 6 Optical OFDMA (a) transmitter and (b) receiver structures.

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Fig. 7
Fig. 7 (a) TDMA-based versus (b) OFDMA-based bandwidth sharing and link scheduling models for various traffic flows and (c), (d) the corresponding comparison results.

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Fig. 8
Fig. 8 Adaptive OFDM subcarrier allocation and assignment algorithm.

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Fig. 9
Fig. 9 Performance comparisons of adaptive subcarrier allocation under various types of traffic flows.

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Equations (4)

Equations on this page are rendered with MathJax. Learn more.

b i = λ [ l + 1 2 ( τ − l ∕ C ) ( μ 2 + σ 2 ) ] .
N TDMA = ⌊ 2 C ( τ C − l ) λ l [ l ( α − 1 ) + 2 τ C ] ⌋ ,
N TDMA = ⌊ C λ l − 1 λ τ ⌋ .
N OFDMA = ⌊ S ⌈ λ l U BPSK ⌉ ⌋ ⩽ ⌊ C λ l ⌋ .
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