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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editors: K. Bergman and O. Gerstel
  • Vol. 4, Iss. 9 — Sep. 1, 2012
  • pp: 671–680

Add/Drop Contention-Aware RWA With Directionless ROADMs: The Offline Lightpath Restoration Case

Pablo Pavon-Marino and Maria-Victoria Bueno-Delgado  »View Author Affiliations

Journal of Optical Communications and Networking, Vol. 4, Issue 9, pp. 671-680 (2012)

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Directionless reconfigurable add/drop multi plexers (ROADMs) permit changing the direction of an added/dropped lightpath without manual intervention. If the ROADM is also colorless, its wavelength can be automatically reconfigured. In broadcast-and-select directionless ROADM architectures, the number of lightpaths that can be added/dropped using the same wavelength is limited by the so-called add/drop contention factor C. This is a source of lightpath blocking that reduces the network capacity. A previous work investigated this aspect for the case of unprotected and 1 + 1 protected lightpaths. In this paper, we address the case in which lightpath restoration is the fault recovery technique in the network. We hypothesize that, using appropriate network planning, the add/drop contention effects can be mitigated. For this, we propose and investigate the add/drop contention-aware routing and wavelength assignment with lightpath restoration offline planning problem, considering colored ROADMs. To solve the problem, an effective heuristic is presented. Extensive results are reported for four reference topologies. In our tests, the reduction in the network capacity caused by add/drop contention is eliminated in practice for factors C = 2 , or even C = 1 in some topologies. These results contribute to the dimensioning of directionless ROADMs.

© 2012 OSA

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

ToC Category:
Regular Papers

Original Manuscript: January 17, 2012
Revised Manuscript: July 11, 2012
Manuscript Accepted: July 19, 2012
Published: August 14, 2012

Pablo Pavon-Marino and Maria-Victoria Bueno-Delgado, "Add/Drop Contention-Aware RWA With Directionless ROADMs: The Offline Lightpath Restoration Case," J. Opt. Commun. Netw. 4, 671-680 (2012)

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