5th International ICST Conference on Broadband Communications, Networks, and Systems

Research Article

QoT-Guaranteed Protection: Survivability Under Physical Layer Impairments

  • @INPROCEEDINGS{10.1109/BROADNETS.2008.4769152,
        author={Sun-il Kim and Nnamdi Nwanze and Xiaolan J.  Zhang and Steven Lumetta},
        title={QoT-Guaranteed Protection: Survivability Under Physical Layer Impairments},
        proceedings={5th International ICST Conference on Broadband Communications, Networks, and Systems},
        publisher={IEEE},
        proceedings_a={BROADNETS},
        year={2010},
        month={5},
        keywords={WDM Network Protection Recovery Quality of Transmission Physical Layer Impairments Crosstalk},
        doi={10.1109/BROADNETS.2008.4769152}
    }
    
  • Sun-il Kim
    Nnamdi Nwanze
    Xiaolan J. Zhang
    Steven Lumetta
    Year: 2010
    QoT-Guaranteed Protection: Survivability Under Physical Layer Impairments
    BROADNETS
    IEEE
    DOI: 10.1109/BROADNETS.2008.4769152
Sun-il Kim1,*, Nnamdi Nwanze2,*, Xiaolan J. Zhang3,*, Steven Lumetta3,*
  • 1: Computer Science Department Information Technology and Systems Center University of Alabama in Huntsville
  • 2: Department of Electrical and Computer Engineering State University of New York at Binghamton
  • 3: Coordinated Science Laboratory Electrical and Computer Engineering Department University of Illinois at Urbana-Champaign
*Contact email: sunilkim@cs.uah.edu, nnamdi.nwanze@binghamton.edu, xzhang29@uiuc.edu, lumetta@uiuc.edu

Abstract

As physical layer impairments play a large role in determining the ultimate performance of all-optical networks, it has attracted much attention. However, traditional survivability schemes have been designed and utilized without considering the quality of transmission at the physical layer. Recently, a few studies on QoT-aware (quality of transmission) protection were initiated to meet the reliability needs of future communications infrastructures. In this paper, we present a study of how transmission impairments caused by non-ideal characteristics of network components (such as amplifier spontaneous emission noise and crosstalk) affect the survivability under various QoTaware protection schemes. We present heuristic QoT-guaranteed protection RWA for dynamic provisioning that forgoes multiple bit-error-rate calculations, and quantify the performance of various QoT-aware schemes. We also evaluate the tradeoff between using crosstalkfree Banyan switches and utilizing switch plane selection with non-crosstalk-free designs. It is expensive to provide QoTguaranteed protection, but the usefulness of QoT-aware (nonguaranteed) schemes, while cost-effective, depends on the topology. Our results also show that QoT-unaware algorithms, while performing significantly worse in terms of blocking, can have slightly better post-failure performance.