An Efficient Approach for Lightpath Restoration in WDM Networks

Abstract

WDM is an incredibly promising technique in which multiple channels are operated along a single fiber, providing the facilities of terabit per second bandwidth. Thus, survivability of WDM networks becomes critical for the success of the next generation internet architecture. Despite that the path-based proactive restoration scheme guarantees 100% restoration as it computes a backup light path while the primary light path is being set up, this method results in additional capacity consumption. In this paper an ideal technique is proposed that modifies the active multi-backup paths method and result in a better restoration scheme. Based on theoretical analysis, the new method is shown to reduce the number of hopes as well as the restoration time.