QoT-aware RWA algorithms for Fast Failure Recovery in All-Optical Networks

Askarian, Amir; Zhai, Yuxiang; Subramaniam, Suresh; Pointurier, Yvan; Brandt-Pearce, Maïté

doi:10.1109/ofc.2008.4528745

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…In the wavelength assignment (WA) process, a suitable wavelength is assigned to the found path in the routing process. The common techniques for wavelength assignment could be First-Fit (FF) [12], random pick (RP) [5], and best-fit [13], [14]. In the first fit (FF), all wavelengths are numbered in sequence, and when an assignment algorithm seeks for a feasible wavelength on the found route, lower-numbered wavelengths are considered before higher-numbered ones.…”

Section: Introductionmentioning

confidence: 99%

Green Distributed Quality of Transmission Aware Routing and Wavelength Assignment in All-Optical Networks

Kakekhani

Rahbar

2013

Journal of Optical Communications

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The Routing and Wavelength Assignment (RWA) algorithms that consider quality of transmission (QoT) in light-path setup spend more time than their conventional counterparts due to exhaustive search and QoT estimation. This paper proposes distributed Quality of Transmission Aware Routing and Wavelength Assignment (QARWA) algorithm to handle dynamic light-path provisioning in wavelength routed all-optical networks taking energy consumption of optical switch nodes into account. Specifically, the QARWA considers bit-error rate (BER), setup delay, and energy consumption constraints at the same time, and establishes light-paths with small BER, low setup latency, and reduced energy consumption. We present and evaluate an enhanced wavelength-assignment solution in the QARWA to handle the wavelength continuity constraint. In QARWA, a source node determines the connection path by means of the shortest path algorithm and a destination node selects a wavelength based on the BER limitation and decreasing order of setup latency. Relating energy consumption to processing time, we show that QARWA can decrease the total energy consumption by reducing the processing time at each node. Under QARWA, when a node finishes the processing of the last control packet, it makes transition to either sleep state or idle state. Hence, QARWA can provide the best performance since it can reduce processing time in control units, light-path setup latency, and energy consumption of nodes.

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Section: Introductionmentioning

confidence: 99%

Green Distributed Quality of Transmission Aware Routing and Wavelength Assignment in All-Optical Networks

Kakekhani

Rahbar

2013

Journal of Optical Communications

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Introduction to Optical Packet Switched (OPS) Networks

Rahbar¹

2015

Quality of Service in Optical Packet Switched Networks

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Performance enhancement for impairment-aware SRLG failure protection in wavelength-routed optical networks

Cheng

Yeo

et al. 2010

Photon Netw Commun

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With the increase of size and number of shared risk link groups (SRLGs) in WDM networks, path protection tends to have longer working paths and backup paths due to SRLG-disjoint constraints, which makes physical impairment a major concern in working path and backup path provisioning, particularly in large-sized all optical networks. As a simple and efficient algorithm, the working path first algorithm is often used for path protection against SRLG failures, where the working path is calculated first by using the shortest-path algorithm on the graph, followed by using the SRLG-disjoint shortest path as backup path. Compared with the working path, the backup path calculated after the working path in the working path first algorithm is more vulnerable to physical impairment, since it may be much longer than the working path. As a result, if we reject those connections that cannot meet the physical impairment requirement, with SRLGs the blocking probability of path protection will be much higher. We argue that impairment must be taken into account together with capacity efficiency in a comprehensive way during SRLG-disjoint working path and backup path selection. To solve this problem, we motivate the needs to study physical impairment-aware sharedpath protection by considering two policies. Policy I uses two SRLG-disjoint least impairment paths as working path and backup path, respectively, and Policy II tries to benefit from both the shortest path and the least impairment path by choosing them intelligently. Analytical and simulation results show: (1) compared with impairment-unawareness, impairment-aware SRLG failure protection performs much better in terms of blocking probability especially with strong physical impairment constraints; (2) impairment-aware SRLG failure protection can significantly reduce physical-layer blocking probability; and (3) the algorithm based on Policy II achieves a good balance between capacity efficiency and physical impairment requirement.

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QoT-aware RWA algorithms for Fast Failure Recovery in All-Optical Networks

Cited by 5 publications

References 3 publications

Green Distributed Quality of Transmission Aware Routing and Wavelength Assignment in All-Optical Networks

Green Distributed Quality of Transmission Aware Routing and Wavelength Assignment in All-Optical Networks

Introduction to Optical Packet Switched (OPS) Networks

Performance enhancement for impairment-aware SRLG failure protection in wavelength-routed optical networks

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