| 1. |
- Agelis, Sacki, et al.
(author)
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Optoelectronic router with a reconfigurable shuffle network based on micro-optoelectromechanical systems
- 2004
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In: Journal of Optical Networking. - Washington, USA : Optical Society of America. - 1536-5379. ; 4:1, s. 1-10
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Journal article (peer-reviewed)abstract
- An optoelectronic router with a shuffle exchange network is presented and enhanced by the addition of micro-optoelectromechanical systems (MOEMS) in the network to add the ability to reconfigure the shuffle network. The MOEMS described here are fully connected any-to-any crossbar switches. The added reconfigurability provides the opportunity to adapt the system to different common application characteristics. Two representative application models are described: The first has symmetric properties, and the second has asymmetric properties. The router system is simulated with the specified applications and an analysis of the results is carried out. By use of MOEMS in the optical network, and thus reconfigurability, greater than 50% increased throughput performance and decreased average packet delay are obtained for the given application. Network congestion is avoided throughout the system if reconfigurability is used.
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| 2. |
- Bagula, Antoine B., et al.
(author)
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On achieving LSP/λSP multiplexing/separation in converged data/optical networks
- 2006
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In: Journal of Optical Networking. - 1536-5379. ; 5:4, s. 280-292
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Journal article (peer-reviewed)abstract
- We revisit the concept of path multiplexing/separation and its impact on the recovery performance in converged data/optical networks. We formulate the rerouting of failed tunnels as a path set finding problem subject to quality of service (QoS) and network control constraints. We solve this problem using a heuristic solution that is based on a cost metric that (1) uses congestion in the optical layer to guide routing decisions and (2) engineers converged multiprotocol label switching networks and multiprotocol lambda switching (MPLS/MPλ S) networks to achieve path multiplexing/separation when rerouting the label switched paths (LSPs) and the lambda switched paths (λ SPs). We apply this solution to achieve multilayer resilience using a mixed scheme where protection switching is complemented by path restoration. We evaluate the performance of this scheme when rerouting the tunnels carrying the traffic offered to 15- and 23-node networks. Simulation reveals performance improvements of the proposed scheme when compared with classical recovery schemes that use several other existing algorithms such as minimum hop algorithm (MHA), open shortest path first (OSPF), and widest shortest path (WSP) in terms of the rerouting efficiency and bandwidth usage optimization.
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| 3. |
- Cerutti, Isabella, et al.
(author)
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Plug and play optical nodes : network functionalities and built-in fiber characterization techniques
- 2007
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In: Journal of Optical Networking. - 1536-5379. ; 6:6, s. 642-653
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Journal article (peer-reviewed)abstract
- \textlessp\textgreater\textlessa href$=$"http://www.osa-jon.org/virtual_issue.cfm?vid$=$26"\textgreaterFeature Issue on Photonics in Switching\textless/a\textgreater\textless/p\textgreaterPlug and play optical (PPO) nodes may be used to facilitate the deployment of optical networks. PPO nodes must be able to learn about the signal propagation properties of the surrounding optical fibers and make their wavelength-routing decisions based on the collected data. We discuss what are the open challenges that must be overcome to provide optical networking solutions based on cost-effective PPO nodes. Three possible PPO node hardware architectures with trade-offs in complexity, cost, and functionality are presented along with their built-in fiber characterization techniques.
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| 4. |
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| 5. |
- Chen, Jiajia, et al.
(author)
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Analysis of protection schemes in PON compatible with smooth migration from TDM-PON to hybrid WDM/TDM-PON
- 2007
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In: Journal of Optical Networking. - 1536-5379. ; 6:5, s. 514-526
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Journal article (peer-reviewed)abstract
- We propose what we believe to be a novel protection scheme compatible with smooth migration from a time-division multiplexing (TDM) passive optical network (PON) to a WDM/TDM-PON. We show that our scheme is very cost effective while keeping connection availability, recovery time, and power budget at an acceptable level. We focus on the protection schemes, overview the existing methods, and introduce a link protection scheme compatible with smooth migration from TDM-PON to hybrid WDM/ TDM-PON. Furthermore, we analyze the cost, connection availability, recovery time, and optical link budget for different protection schemes in order to find the cost-effective solution both for the TDM-PON and hybrid WDM/ TDM- PON. (c) 2007 Optical Society of America.
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| 6. |
- Chen, Jiajia, et al.
(author)
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Self-protection scheme against failures of distributed fiber links in an Ethernet passive optical network
- 2006
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In: Journal of Optical Networking. - 1536-5379. ; 5:9, s. 662-666
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Journal article (peer-reviewed)abstract
- A novel self-protection scheme for an Ethernet passive optical network is introduced and studied at both the physical and the media access control layers. The scheme is simple and fast and can provide 1: 1 protection and automatic traffic restoration against the fiber link failure between a remote node ( RN) and any optical network unit (ONU). Simulation results show that fiber failure does not degrade the transmission performance, and the restoration time depends mainly on the switch time of the physical layer. Our protection scheme saves many long fibers, does not influence other normal ONUs, and requires no active device in the RN.
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| 7. |
- Grover, W. D., et al.
(author)
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High availability in optical networks : Introduction to the feature issue
- 2007
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In: Journal of Optical Networking. - 1536-5379. ; 6:3, s. 319-321
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Journal article (peer-reviewed)abstract
- The Journal of Optical Networking's (JON) feature issue, focuses on architectures, technologies, and theory for achieving high service availability in optical transport networks. The feature accepted 14 submissions for publication, these works reflect some important directions and objectives in optical networking research. These papers can be categorized under three themes, cost considerations in survivable optical networks, optimization in survivability design including resource sharing schemes, availability guarantees, and capacity efficiency, protection in IP/MPLS over WDM. J. Farkas, A. Paradisi, and C. Antal, in their paper, proposes and experimentally validates a low-cost, robust, and scalable Ethernet-over-fiber network architecture with fast recovery from both node and link failures. The paper submitted by M. Scheffel proposes an interesting sort of template or building-block approach to constructing the end-to-end topology of a service path.
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| 8. |
- Monti, Paolo, et al.
(author)
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Resource-efficient path-protection schemes and online selection of routes in reliable WDM networks
- 2004
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In: Journal of Optical Networking. - 1536-5379. ; 3:4, s. 188-203
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Journal article (peer-reviewed)abstract
- Feature Issue on Next-Generation WDM Network Design and Routing (WDMN) The optimal choice of routing and wavelength assignment (RWA) for the working and protection path-pair of the newly generated demand request is often a complex problem in reliable wavelength-division-multiplexed (WDM) networks subject to dynamic traffic. The challenge is twofold: how to provide the required reliability level without over-reserving network resources and how to find a good solution of the RWA problem under constrained computational time. Two important contributions are made. First, the shared path protection (SPP) switching scheme is generalized to guarantee the required (differentiated) level of reliability to all arriving demands, while, at the same time, ensuring that they contain the required amount of reserved network resources. This generalization is referred to as SPP-DiR. Second, an approach for choosing the working and protection path-pair routing for the arriving demand is proposed. The approach is based on a matrix of preselected path-pairs: the disjoint path-pair matrix (DPM). Results show that, when the SPP-DiR scheme is applied, a small reduction in demand reliability corresponds to a significant reduction of the required network resources, when compared with the conventional SPP. In turn, the demand blocking probability may be reduced more than one order of magnitude. It is also shown that the DPM approach is suitable for obtaining satisfactory RWA solutions in both SPP-DiR and conventional SPP networks. The use of the DPM is most suited when the time for solving the RWA problem is constrained, e.g., when demand requests must be served swiftly.
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