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Photonic Network Communications

, Volume 12, Issue 3, pp 295–307 | Cite as

Hybrid protection in WDM networks with shared risk link groups

  • Xu Shao
  • Gaoxi Xiao
  • Luying Zhou
  • Xiaofei Cheng
  • Yixin Wang
Original Article

Abstract

In wavelength-division multiplexing net- works with shared-risk link groups (SRLGs), it remains as a challenge to provide network protections with low-blocking probabilities and short average protection-swi- tching time. Based on the observation that in networks with SRLGs, link protection frequently helps avoid over-long backup routes and traps, we propose a novel hybrid protection scheme, with the objective of combining the high-average capacity efficiency of shared-path protection with the fast recovery and simple trap avoidance of shared-link protection. Extensive simulation results show that the proposed scheme steadily achieves lower blocking probabilities than both the shared-path and the shared-link protections, while the average protection-switching time is shortened as well. Meanwhile, the signaling and control procedures of the proposed scheme are kept with reasonable complexities.

Keywords

Shared risk link group Hybrid-shared protection Shared-path protection Shared-link protection Wavelength-division multiplexing networks 

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Xu Shao
    • 1
  • Gaoxi Xiao
    • 2
  • Luying Zhou
    • 1
  • Xiaofei Cheng
    • 1
  • Yixin Wang
    • 1
  1. 1.Institute for Infocomm ResearchSingaporeSingapore
  2. 2.School of EEENanyang Technological UniversitySingaporeSingapore

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