Enabling ASON Routing via Novel Signal Quality Metrics

Li, Jonathan C.; Hinton, Kerry; Dods, S.D.; Farrell, Peter M.

doi:10.1109/ofc.2007.4348936

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…Since all the paths within the domain are computed by the PCE, lightpath provisioning both optimizes the resource utilization and guarantees a required level of optical signal quality. In [34], an algorithm for path selection in automatically switched optical networks (ASON) based on eye closer penalty (ECP), Q-factor, and modified OSPF protocol is presented. Through simulations, it was shown that ECP caused by various impairments can be combined approximately linearly on dB scale.…”

Section: Pli-aware Wavelength Assignmentmentioning

confidence: 99%

Physical layer impairment aware routing (PLIAR) in WDM optical networks: issues and challenges

Saradhi

Subramaniam

2009

IEEE Commun. Surv. Tutorials

149

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Abstract-In WDM optical networks, the physical layer impairments (PLIs) and their significance depend on network type-opaque, translucent, or transparent; the reach-access, metro, or core/long-haul; the number and type of network elements-fiber, wavelengths, amplifiers, switching elements, etc.; and the type of applications-real-time, non-real time, missioncritical, etc. In transparent optical networks, PLIs incurred by non-ideal optical transmission media accumulate along an optical path, and the overall effect determines the feasibility of the lightpaths. If the received signal quality is not within the receiver sensitivity threshold, the receiver may not be able to correctly detect the optical signal and this may result in high bit-error rates. Hence, it is important to understand various PLIs and their effect on optical feasibility, analytical models, and monitoring and mitigation techniques. Introducing optical transparency in the physical layer on one hand leads to a dynamic, flexible optical layer with the possibility of adding intelligence such as optical performance monitoring, fault management, etc. On the other hand, transparency reduces the possibility of client layer interaction with the optical layer at intermediate nodes along the path. This has an impact on network design, planning, control, and management.Hence, it is important to understand the techniques that provide PLI information to the control plane protocols and that use this information efficiently to compute feasible routes and wavelengths. The purpose of this article is to provide a comprehensive survey of various PLIs, their effects, and the available modeling and mitigation techniques. We then present a comprehensive survey of various PLI-aware network design techniques, regenerator placement algorithms, routing and wavelength assignment algorithms, and PLI-aware failure recovery algorithms. Furthermore, we identify several important research issues that need to be addressed to realize dynamically reconfigurable next-generation optical networks. We also argue the need for PLI-aware control plane protocol extensions and present several interesting issues that need to be considered in order for these extensions to be deployed in real-world networks.Index Terms-Wavelength division multiplexing, wavelengthrouted optical networks, routing and wavelength assignment, optical performance monitoring, optical layer service level agreements, transmission impairments, quality of transmission, physical layer impairment aware routing, impairment constraintbased routing, regenerator placement algorithms, physical layer impairment aware control plane, GMPLS-based WDM networks, and IP over WDM networks.

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Section: Pli-aware Wavelength Assignmentmentioning

confidence: 99%

Physical layer impairment aware routing (PLIAR) in WDM optical networks: issues and challenges

Saradhi

Subramaniam

2009

IEEE Commun. Surv. Tutorials

149

View full text Add to dashboard Cite

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“…Our work makes use of the techniques previously developed in [4] to compute the signal quality and Bit Error Rate (BER) associated with any candidate path under consideration from multiple static optical impairments such as PMD, RCD and ASE. This method did not include nonlinear fiber effects and assumed that the optical impairments are independent.…”

Section: Computing Candidate Path Signal Quality and Outage Probabilitymentioning

confidence: 99%

“…We propose to modify OSPF in order to support outage probability based routing and wavelength assignment in all-optical networks. This is done by extending on modifications previously described in [4], which were (i) to using the estimate of ECP as the cost metric, instead of the currently implemented metric within the OSPF link state advertisement and update packets, and (ii) to replace Dijkstra's algorithm with a modified Bellman-Ford algorithm [9] to calculate the minimum spanning tree. In optical networks, a link may improve signal quality and cause a reduction in ECP or a "negative" cost.…”

Section: Required Modifications To Routing Algorithmsmentioning

confidence: 99%

Novel Outage Probability Based RWA Algorithm

Hinton

Dods

et al. 2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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“…However, these tools do not provide a path computation at a certain time considering a realistic combination of constrains but off-line route planning function focusing on specific constrains, and the migration into the NMS has not yet been investigated in detail. On the other hand, the introduction of physical constraints into the GMPLS routing protocols [6] has been also investigated [7,8]. Although these approaches are an attractive solution for dynamic transparent networks, there is still a great concern about routing scalability when a bunch of physical impairment information is introduced as an extension.…”

mentioning

confidence: 99%

Optical Path Computation Element interworking with Network Management System for Transparent Mesh Networks

Tsuritani

Miyazawa

Kashihara

et al. 2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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Optical PCE and its interwork with the NMS were investigated for planning and operation of optical transparent networks. We successfully verified effective and fast optical-path computation taking into account the physical impairments and wavelength continuity. 2008 Optical Society of America OCIS codes: (060.4250) Networks; (060.4510) Optical communications 1Introduction Recent progress of optical wavelength selective switches (WSS) and optical transponders employing enhanced forward error correction (FEC) and a novel modulation format enables to deploy optical transparent networks in a more flexible and cost-effective manner. The network architecture based on these technologies is being commercially adopted all over the world and considered as the most promising one [1]. Such transparent networks are quite attractive to operators because elimination of O/E/O conversion in intermediate optical nodes leads to not only the simplification of network architecture but also reduction of capital expenditure, comparing with an existing opaque network. Furthermore, network transparency about bit-rate and data-format enables to simultaneously offer various services with a different bandwidth, ensuring the upgradeability to meet future unpredictable bandwidth demands. However, network planning and design for deployment of such networks are getting harder and harder, since more parameters need to be considered. In conventional reconfigurable optical add/drop multiplexer (ROADM) networks, the topology is basically a ring and the transparent path is limited within the ring. On the other hand, in the transparent mesh networks using multi-degree ROADM (Wavelength cross-connect: WXC), it is more complicated to design end-to-end optimum routes over multiple rings with the consideration of inserting electrical regenerators (3R) adaptively. Considering network expansion and network, the initially selected route will be no more optimized as the time being. Therefore, in order to mitigate the complexity of the route planning [2] and to reduce the equipment cost as much as possible by appropriately assigning the regenerators, the designing, planning and computing tool for a provision of optical paths with the consideration of the physical impairments and wavelength continuity constraints is indispensable for effective network operation and management, while updating actual network topology information by interworking with network management systems (NMS). Furthermore, in conventional ROADM ring networks where single vender's ROADM equipment is utilized, the network can be usually managed by using the vender's equipment management system (EMS). Considering future multi-vendor environment for transparent optical network by introducing WXC, universal tools to design optical paths over multiple domains will be also required.Recently, the investigation about route planning in mesh optical networks, taking into account the physical impairments such as amplifier spontaneous emission (ASE) noise accumulation, chromatic dispersion (CD), polari...

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Enabling ASON Routing via Novel Signal Quality Metrics

Abstract: We propose a new algorithm for path selection in Automatically Switched Optical Networks (ASONs), based on eye closure penalty, Q-factor and a modified OSPF protocol. We demonstrate the technique for a nine node network.

Cited by 5 publications

References 9 publications

Physical layer impairment aware routing (PLIAR) in WDM optical networks: issues and challenges

Physical layer impairment aware routing (PLIAR) in WDM optical networks: issues and challenges

Novel Outage Probability Based RWA Algorithm

Optical Path Computation Element interworking with Network Management System for Transparent Mesh Networks

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