Alternate Multihop Routing in Limited Reconfigurable Optical Networks

In this paper, we investigate the performance of limited reconfigurable optical networks when multihopping is used. Multihopping is achieved by dropping a wavelength at an intermediate node and transmitting on another wavelength at that node (O-E-O). A route can consist of several such hops each obeying the wavelength continuity constraint individually. Considering that a receiver and a transmitter are used for add/drop at a node, multihopping is restricted by the number of transponders and their tunabilities. We develop a dynamic routing strategy based on the availability and tunability of transponders as well as the wavelength availability. We adopt a Share-Per-Link model for the usage of transponders within a reconfigurable node, and each node is assumed to be equipped with a ROADM which can add/drop any wavelength to any of the ports. We show that the proposed routing strategy improves the blocking performance significantly compared to fixed routing with or without multihopping or alternate routing methods without multihopping.

[1]  Rauf Izmailov,et al.  Hierarchical optical switching: a node-level analysis , 2002, Workshop on High Performance Switching and Routing, Merging Optical and IP Technologie.

[2]  Wei Guo,et al.  On-line integrated routing in dynamic multifiber IP/WDM networks , 2004, IEEE Journal on Selected Areas in Communications.

[3]  Suresh Subramaniam,et al.  All-optical networks with sparse wavelength conversion , 1996, TNET.

[4]  B. Mukherjee,et al.  A Review of Routing and Wavelength Assignment Approaches for Wavelength- Routed Optical WDM Networks , 2000 .

[5]  Bo Li,et al.  Dynamic routing and wavelength assignment in the presence of wavelength conversion for all-optical networks , 2005, IEEE/ACM Transactions on Networking.

[6]  S. Subramaniam,et al.  Blocking and Waveband Assignment in WDM Networks with Limited Reconfigurability , 2007, OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference.

[7]  Suresh Subramaniam,et al.  Blocking in Reconfigurable Optical Networks , 2007, IEEE INFOCOM 2007 - 26th IEEE International Conference on Computer Communications.

[8]  Chunming Qiao,et al.  A study of waveband switching with multilayer multigranular optical cross-connects , 2003, IEEE J. Sel. Areas Commun..

[9]  Chao Lu,et al.  The impact of number of transceivers and their tunabilities on WDM network performance , 2000, IEEE Communications Letters.

[10]  L. Paraschis,et al.  Evaluation of tunable laser applications in metropolitan networks , 2004, Optical Fiber Communication Conference, 2004. OFC 2004.

[11]  Chunming Qiao,et al.  Waveband Switching for Dynamic Traffic Demands in Multigranular Optical Networks , 2007, IEEE/ACM Transactions on Networking.