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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. 12 — Dec. 1, 2012
  • pp: 1046–1061

Extending Light-Trails to Regional Networks: Multi-hop Light-Trails (MLT)—System Design and Performance

Ashwin Gumaste, Tamal Das, Raviraj Vaishampayan, Jianping Wang, and Arun Somani  »View Author Affiliations


Journal of Optical Communications and Networking, Vol. 4, Issue 12, pp. 1046-1061 (2012)
http://dx.doi.org/10.1364/JOCN.4.001046


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Abstract

A light-trail is a generalization of a lightpath allowing multiple nodes to be able to communicate along the path, leading to all-optical spatial traffic grooming. A light-trail exhibits properties of dynamic bandwidth provisioning, optical multicasting and sub-wavelength grooming, and architecturally is analogous to a shared wavelength optical bus. Arbitration within the bus is conducted by an out-of-band control channel. The bus feature results in a node that has a large pass-through loss, restricting the size of a light-trail to metro environments. Due to this limitation, it is difficult to extend the light-trail concept to regional or core networks. In this paper we exhaustively investigate the concept of multi-hop light-trails (MLTs)—a method to provide multi-hop communication in light-trails, thus enhancing their reach. Node architecture and protocol requirements for creating MLTs are discussed. We then discuss design issues for MLTs in regional area networks through a problem formulation that is solved using convex optimization. The problem formulation takes into consideration issues such as routing MLTs as well as assigning connections (defined as sub-wavelength traffic requests) to MLTs. Two polynomial-time heuristic algorithms for creation of MLTs are presented. One of the algorithms is a static implementation, while the other is a dynamic implementation—with unknown traffic. A detailed delay analysis is also presented that enables computation of end-to-end delay over MLTs using different flow assignment algorithms. A simulation study validates the MLT concept.

© 2012 OSA

OCIS Codes
(060.4250) Fiber optics and optical communications : Networks
(060.4252) Fiber optics and optical communications : Networks, broadcast

ToC Category:
Research Papers

History
Original Manuscript: January 10, 2012
Revised Manuscript: July 27, 2012
Manuscript Accepted: September 6, 2012
Published: November 30, 2012

Citation
Ashwin Gumaste, Tamal Das, Raviraj Vaishampayan, Jianping Wang, and Arun Somani, "Extending Light-Trails to Regional Networks: Multi-hop Light-Trails (MLT)—System Design and Performance," J. Opt. Commun. Netw. 4, 1046-1061 (2012)
http://www.opticsinfobase.org/jocn/abstract.cfm?URI=jocn-4-12-1046

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