Abstract
In an optical wavelength-division multiplexing (WDM) network,the failure of a network element (e.g., fiber link, cross-connect, etc.) can cause the failure of several optical channels, thereby leading to large data (and revenue) loss.1 A significant amount of work has been done to provide protection switching in ring topologies.As networks migrate from stacked rings to meshes because of the excessive resource redundancy used in ring-based protection, mesh-structured protection schemes have been receiving increasing attention.2–5 The work in Ellinas et al. decomposes a mesh topology into protection cycles, which then perform automatic protection switching (APS). The work by Ho and Mouftah3 addresses mesh-structured protection by dividing a given working path into overlapped segments while protecting each segment separately.It,however,works on a per-working-path basis and computes working paths completely prior to backup paths.
© 2002 Optical Society of America
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