Comparison of Opaque and Translucent WDM Networks with Different Regenerator-Placement Strategies under Static and Dynamic Traffic

In this paper we compare the performance of opaque and translucent Optical Transport Networks (OTNs) taking into account different regenerator placement strategies. The translucent approach achieves noticeable results under static traffic in terms of saving of deployed resources. On the other hand in the dynamic scenario a translucent OTN suffers from fewer resources and may display high blocking probability. We describe our planning procedure that is composed of two main steps: the first one selects a subset of network nodes that can host regeneration devices solving the Regenerator Placement Problem (RPP) by the means of three different heuristic allocation algorithms; the second one computes the amount of resources (number of transponders and DWDM systems) accomplishing the Routing and Wavelength Assignment with Regenerator Problem (RWA-RP) to satisfy a given set of static traffic demands. This dimensioning procedure is applied both to a translucent and to an opaque implementation of the same OTN showing the CAPEX benefit of the first approach. Subsequently both translucent and opaque versions of the OTN are simulated under dynamic traffic, displaying the greater robustness of the opaque case to blocking, no matter what regenerator placement algorithm has been adopted. To back up this conclusion we carried out a further analysis on the power consumption.

[1]  H. Waldman,et al.  Trading network management complexity for blocking probability when placing optical regenerators , 2008, 2008 International Conference on High Performance Switching and Routing.

[2]  Didier Colle,et al.  Pan-European Optical Transport Networks: An Availability-based Comparison , 2004, Photonic Network Communications.

[3]  Arunabha Sen,et al.  On Sparse Placement of Regenerator Nodes in Translucent Optical Network , 2008, IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference.

[4]  S. Personick.  Receiver design for digital fiber optic communication systems, II , 1973 .

[5]  J. Sole-Pareta,et al.  Performance of translucent optical networks under dynamic traffic and uncertain physical-layer information , 2009, 2009 International Conference on Optical Network Design and Modeling.

[6]  Byrav Ramamurthy,et al.  Sparse Regeneration in Translucent Wavelength-Routed Optical Networks: Architecture, Network Design and Wavelength Routing , 2005, Photonic Network Communications.

[7]  Miss A.O. Penney.  (b) , 1974, The New Yale Book of Quotations.

[8]  J. Berthold,et al.  Optical Networking: Past, Present, and Future , 2008, Journal of Lightwave Technology.

[9]  Matthias Scheffel.  Regenerator allocation strategies for optical transparency domains considering transmission limitations , 2005, IEEE International Conference on Communications, 2005. ICC 2005. 2005.

[10]  Xi Yang,et al.  Sparse regeneration in a translucent WDM optical network , 2001, SPIE/OSA/IEEE Asia Communications and Photonics.

[11]  Daniel Kharitonov,et al.  Power Saving Strategies and Technologies in Network Equipment Opportunities and Challenges, Risk and Rewards , 2008, 2008 International Symposium on Applications and the Internet.

[12]  A. Morea,et al.  A critical analysis of the possible cost savings of translucent networks , 2005, DRCN 2005). Proceedings.5th International Workshop on Design of Reliable Communication Networks, 2005..

[13]  J.P. Heritage,et al.  Transparent vs. opaque vs. translucent wavelength-routed optical networks , 1999, OFC/IOOC . Technical Digest. Optical Fiber Communication Conference, 1999, and the International Conference on Integrated Optics and Optical Fiber Communication.

[14]  Peter Roorda,et al.  Evolution to Colorless and Directionless ROADM Architectures , 2008, OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference.

[15]  Byrav Ramamurthy,et al.  Translucent optical WDM networks for the next-generation backbone networks , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[16]  Si Chen,et al.  The regenerator location problem , 2010, Networks.

[17]  Andrea Fumagalli,et al.  Regenerator Placement with Guaranteed Connectivity in Optical Networks , 2007, ONDM.

[18]  A.A.M. Saleh.  Transparent optical networking in backbone networks , 2000, Optical Fiber Communication Conference. Technical Digest Postconference Edition. Trends in Optics and Photonics Vol.37 (IEEE Cat. No. 00CH37079).

[19]  Rodney S. Tucker,et al.  Translucent Optical Networks: The Way Forward , 2007 .