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  • Received: Jun. 1, 2004

    Accepted: --

    Posted: Jun. 6, 2006

    Published Online: Jun. 6, 2006

    The Author Email: Guolong Zhu (guolongzhu@sjtu.edu.cn)

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    Guolong Zhu, Qingji Zeng, Tong Ye, Junjie Yang. Protection switching schemes of multi-granularity p-cycles in survivable WDM networks[J]. Chinese Optics Letters, 2004, 2(9): 09508

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Chinese Optics Letters, Vol. 2, Issue 9, 09508 (2004)

Protection switching schemes of multi-granularity p-cycles in survivable WDM networks

Guolong Zhu*, Qingji Zeng, Tong Ye, and Junjie Yang

Author Affiliations

  • The State Key Laboratory on Fiber-optical Local Area Networks and Advanced Optical Communication Systems, Shanghai Jiao Tong University, Shanghai 200030

Abstract

In this paper, a novel concept of multi-granularity p-cycle is proposed. In conventional p-cycle concept, all on-cycle spans have the same capacity. However, in multi-granularity p-cycle, each on-cycle span could have different capacity. Results show that multi-granularity p-cycles are much more capacity-efficient and cost-effective than conventional p-cycles. We also propose two protection switching schemes for all types of p-cycle networks. One is wrapping protection, in which only two end nodes do real-time switching when a span failure happens. The other is steering protection, in which at most four nodes do real-time switching when a span fails. In steering protection switching scheme, the restoration path for the failure traffic demand has the least hops.

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