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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editor: Keren Bergman
  • Vol. 8, Iss. 2 — Feb. 1, 2009
  • pp: 130–145

Shared-path protection with extra traffic in ASON-GMPLS ring networks

Luis Velasco, Salvatore Spadaro, Jaume Comellas, and Gabriel Junyent  »View Author Affiliations

Journal of Optical Networking, Vol. 8, Issue 2, pp. 130-145 (2009)

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We implement shared-path protection (SPP) with extra traffic in automatically switched optical network (ASON) rings provided with a generalized multiprotocol label switching (GMPLS) control plane. The protection time provided by the SPP scheme is analyzed as a function of the switching time of the wavelength-selective switches (WSS), the key components to building reconfigurable optical nodes. We demonstrate that the switching time of the currently available WSS prevents the protection of the complete set of affected label-switched paths (LSPs) within 50 ms after fault detection. Therefore, two alternative strategies can be considered, namely, (1) the definition of two classes of protection with different requirements in terms of protection time, and (2) a real-time mechanism to decide, on the basis of the current number of LSPs to protect, whether the protection scheme to apply is either at the path layer or at the link layer. When protecting at the path layer, part of the extra traffic will be saved, whereas all the extra traffic will be preempted when protecting at the link layer.

© 2009 Optical Society of America

OCIS Codes
(060.1155) Fiber optics and optical communications : All-optical networks
(060.4251) Fiber optics and optical communications : Networks, assignment and routing algorithms
(060.4261) Fiber optics and optical communications : Networks, protection and restoration

ToC Category:
Research Papers

Original Manuscript: July 24, 2008
Revised Manuscript: November 19, 2008
Manuscript Accepted: November 21, 2008
Published: January 12, 2009

Luis Velasco, Salvatore Spadaro, Jaume Comellas, and Gabriel Junyent, "Shared-path protection with extra traffic in ASON-GMPLS ring networks," J. Opt. Netw. 8, 130-145 (2009)

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