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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editors: K. Bergman and V. Chan
  • Vol. 3, Iss. 9 — Sep. 1, 2011
  • pp: 641–650

New Strategies for Connection Protection in Mixed-Line-Rate Optical WDM Networks

Menglin Liu, Massimo Tornatore, and Biswanath Mukherjee  »View Author Affiliations

Journal of Optical Communications and Networking, Vol. 3, Issue 9, pp. 641-650 (2011)

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Today’s optical wavelength division multiplexing backbone networks need to support traffic demands with very diverse capacity requirements. Recent studies have shown how to design an optical transport network that supports mixed line rates (MLR), where the wavelength channels of the optical paths (i.e., lightpaths) can have a variety of capacities (10/40/100 Gbps). Some preliminary work on the design of MLR optical networks has already appeared, but survivability, which is a key concern in optical network design, is a nascent topic in MLR networks. This study investigates the problem of protection in MLR optical networks: in particular, we study how to design a cost-effective transparent MLR network that provides dedicated protection at the lightpath level. We propose three mechanisms: MLR-at-p-lightpath protection (MLR-p), MLR-at-lightpath protection (MLR-l), and MLR-with-backup-flow-grooming protection (MLR-g). The design problem is solved by two different approaches: (1) a two-step approach that formulates part of the problem as an integer linear program and (2) a heuristic approach. Our results show that, by appropriate assignment of rates to lightpaths, MLR networks can provide protection for diverse traffic demands with much lower transponder cost compared to single-line-rate networks.

© 2011 OSA

OCIS Codes
(060.4254) Fiber optics and optical communications : Networks, combinatorial network design
(060.4256) Fiber optics and optical communications : Networks, network optimization
(060.4257) Fiber optics and optical communications : Networks, network survivability
(060.4265) Fiber optics and optical communications : Networks, wavelength routing

ToC Category:
Research Papers

Original Manuscript: November 18, 2010
Revised Manuscript: July 5, 2011
Manuscript Accepted: July 10, 2011
Published: August 9, 2011

Menglin Liu, Massimo Tornatore, and Biswanath Mukherjee, "New Strategies for Connection Protection in Mixed-Line-Rate Optical WDM Networks," J. Opt. Commun. Netw. 3, 641-650 (2011)

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