Abstract
Waveband switching (WBS) is introduced to group multiple wavelengths
together as a band or fiber and switch the group using a single port
whenever possible. Instead of using the traditional optical cross-connects
(T-OXCs), WBS networks employ multi-granular optical cross-connects
(MG-OXCs) to switch the traffic at different granularities. In this work, we
first briefly review and discuss the development in MG-OXC architecture
design, routing and wavelength assignment algorithms, and protection schemes
in WBS networks. Then two new schemes are proposed to solve the waveband
assignment problem and waveband protection problem. In the first scheme, we
demonstrate that factors such as bypass traffic and node degree can affect
the waveband switching efficiency. A new hierarchical waveband assignment
(HWA) algorithm is then proposed to effectively take these wavebanding
factors into consideration for saving ports. In the second scheme, we
introduce the concept of band-segment and explore band-segment based
protection schemes to achieve the goal of port reduction, the sharing of
resources and survivability in WBS networks. Our simulations show that the
proposed HWA scheme outperforms a representative approach, namely balanced
path routing with heavy-traffic first waveband assignment (BPHT), by up to
18% in terms of port reduction. For the first time, our study demonstrates
that protection and the sharing of resources can be achieved without
sacrificing port saving when the proposed concept of band-segment is
efficiently adopted in WBS networks.
© 2010 IEEE
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