Regenerator Placement Strategies for Translucent OBS Networks

Pedrola, Oscar; Careglio, Davide; Klinkowski, Mirosław; Sole-Pareta, J.

doi:10.1109/jlt.2011.2168806

Cited by 5 publications

(11 citation statements)

References 42 publications

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“…To design the translucent SWS network we follow the approach presented in [22,23]. Specifically, we first consider a QoT model based on the off-line estimation of the OSNR contributions of both nodes and links in the end-to-end signal path.…”

Section: Translucent Sws Network Designmentioning

confidence: 99%

“…Using the OSNR model detailed in Section III, and assuming an OSNR th = 21 dB (2 dB penalty [23]), we show in Fig. 7 the percentage of paths that require regeneration at some intermediate node for both the DWC and SPN architectures.…”

Section: B Translucent Spn Network Dimensioningmentioning

confidence: 99%

“…Indeed, in such a case, RRP extends to the so-called routing and regenerator placement and dimensioning (RRPD) problem [22,23]. With the routing paths and locations of regenerators selected (RRP), the dimensioning phase (D) is responsible for obtaining the minimum amount of such regenerators so as to meet a pre-defined target QoT network performance.…”

Section: Introductionmentioning

confidence: 99%

“…Here, fairness means that any packet entering the regenerator pool may access any regenerator, and thus there exists a fair competition for the use of regenerators. Note that this feature has important implications during the network planning stage, as it allows for a significant simplification of the RRPD problem [23].…”

Section: Introductionmentioning

confidence: 99%

“…To this end, we first model and assess the performance of a set of translucent WC-sharing switching fabrics and, considering a realistic node configuration for OTNs, we select one of the WC-sharing nodes to perform an adequate power-budget and noise analysis. Then, considering an optical-signal-to-noise-ratio-(OSNR-) based QoT model and an RRPD algorithm [22,23], a translucent SWS network based on WC-sharing nodes is equipped with the required pools of regenerators. Through simulation, we approximate the exact number of WCs that are required at each node to meet the loss performance of the DWC case.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Cost Feasibility Analysis of Translucent Optical Networks With Shared Wavelength Converters

Pedrola

Careglio

Klinkowski

et al. 2013

J. Opt. Commun. Netw.

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Abstract-Translucent optical networks have emerged as potential yet feasible candidates to bridge the gap between the opaque and transparent network architectures. By allowing electrical 3R signal regeneration only at selected points in the network, translucent architectures represent a cost-effective, power-efficient solution. Concurrently, forecasts predicting highly dynamic traffic patterns make it crucial for next-generation transport networks to engage highly agile technologies that include sub-wavelength switching (SWS). In translucent SWS networks, contention resolution is achieved through the still technologically immature all-optical wavelength converters (WCs). Since WCs are expected to be expensive, power-consuming devices, there has been significant research effort on devising WC-sharing architectures, which aim at minimizing the number of these devices in the network. WC sharing, however, requires complex switching fabrics that involve a much higher number of optical gates and stronger degradation due to physical layer impairments (more electrical 3R regenerators). It is clear, then, that the technological interest in WC-sharing architectures mainly depends on the cost trade-offs existing between these three components. For this reason, in this work, we carry out a comprehensive cost feasibility analysis of translucent networks based on asynchronous WC-sharing packet switches. After modeling a set of translucent WC-sharing switching fabrics, we assess their performance in an isolated node scenario in terms of the number of WCs and optical gates required. Given the results obtained, we select the shared-per-node (SPN) architecture to compare its hardware requirements with those of a network based on dedicated WC nodes (i.e., one WC per wavelength and input port). To this end, an iterative simulation algorithm is used to dimension translucent SWS networks considering a broad range of continental-scale topologies. The results are first analyzed using relative cost values, and finally the viability/feasibility of WC-sharing schemes is discussed considering state-of-the-art technology. Our main conclusion is that, for SPN-based architectures to become cost effective, the cost of WCs has to be at least two orders of magnitude higher than that of the optical gate and similar to or lower than that of the electrical 3R regenerator.

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Section: Translucent Sws Network Designmentioning

confidence: 99%

Section: B Translucent Spn Network Dimensioningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cost Feasibility Analysis of Translucent Optical Networks With Shared Wavelength Converters

Pedrola

Careglio

Klinkowski

et al. 2013

J. Opt. Commun. Netw.

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show abstract

Metaheuristic hybridizations for the regenerator placement and dimensioning problem in sub-wavelength switching optical networks

Pedrola

Careglio

Klinkowski

et al. 2013

European Journal of Operational Research

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Cross-layer enabled translucent optical network with real-time impairment awareness

Pedrola

Bathula

Wang

et al. 2012

2012 IEEE Global Communications Conference (GLOBECOM)

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Abstract-The existing dimensioning strategy for translucent, sub-wavelength switching architectures relies on overprovisioning, and consequently, overuse of costly, powerconsuming optical-electrical-optical (O/E/O) regenerators. In addition, due to a variety of external phenomena, many physical layer impairments are time-varying, and hence, can strongly degrade network performance. In this work, we introduce a Cross-Layer Optical Network Element (CLONE) used for the dynamic management of physical layer impairments in the network. We investigate the impact of real-time impairment aware routing in a CLONE-enabled optical network with subwavelength switching. Simulation results show that the CLONEenabled network architecture provides improvements in: (1) energy efficiency by optimizing the usage of regenerators, and (2) network performance in terms of the packet loss probability.

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Regenerator Placement Strategies for Translucent OBS Networks

Cited by 5 publications

References 42 publications

Cost Feasibility Analysis of Translucent Optical Networks With Shared Wavelength Converters

Cost Feasibility Analysis of Translucent Optical Networks With Shared Wavelength Converters

Metaheuristic hybridizations for the regenerator placement and dimensioning problem in sub-wavelength switching optical networks

Cross-layer enabled translucent optical network with real-time impairment awareness

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