&lt;title&gt;Restoration mechanisms based on tunable lasers for handling channel and link failures in optical WDM networks&lt;/title&gt;

Krishnamurthy, Harini; Sivalingam, Krishna M.; Mishra, Manish Kumar

doi:10.1117/12.475309

Cited by 7 publications

(2 citation statements)

References 23 publications

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“…The failures are of two typeslink and node failure [17,21]. The failures are of two typeslink and node failure [17,21].…”

Section: Relevant Workmentioning

confidence: 99%

Reduction of Blocking Probability in Restricted Shared Protected Optical Network using Alternate Path Routing and Wavelength Converter Placement

Sahu¹,

Pradhan²

2008

Journal of Optical Communications

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In this paper, we have proposed a restricted shared protection scheme in wavelength convertible optical network. In our proposed approach, we have included both alternate path routing and partial placement of wavelength converter for reduction of blocking probability. With computer simulation, we have evaluated the performance of our proposed approach, by comparing it with the existing shared protection

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“…The failures are of two typeslink and node failure [17,21]. The failures are of two typeslink and node failure [17,21].…”

Section: Relevant Workmentioning

confidence: 99%

Reduction of Blocking Probability in Restricted Shared Protected Optical Network using Alternate Path Routing and Wavelength Converter Placement

Sahu¹,

Pradhan²

2008

Journal of Optical Communications

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“…When a node fails, the affected lightpaths have to be handled by the other nodes. Other types of component failures are also possible [16], but are not addressed in this paper. In this paper, we focus on the handling of link failures.…”

Section: Introductionmentioning

confidence: 99%

Protection mechanisms for optical WDM networks based on wavelength converter multiplexing and backup path relocation techniques

Gowda¹,

Sivalingam²

IEEE INFOCOM 2003. Twenty-Second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37

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Abstract-This paper studies the problem of designing survivable optical wavelength division multiplexed (WDM) networks. A wavelength-routed wide area backbone network supporting circuit-switched traffic is considered. This paper also considers the use of optical wavelength conversion technology which has been shown to help improve network performance. However, wavelength conversion is still an expensive technology and using optical conversion could potentially result in signal quality degradation.In survivable networks, protection against failures is provided using backup paths that are determined when a session is established. In this paper, we present three primary and backup route computation mechanisms that attempt to improve overall network performance compared to existing solutions. One of the key design goals is to reduce the number of required converters per node. First, we present a routing algorithm, termed conversion free primary routing (CFPR) that computes primary paths without wavelength conversion, as far as possible. Next, we present a converter multiplexing technique that is used to share wavelength converters among multiple backup paths. This significantly reduces the number of connections blocked due to wavelength converter unavailability and reduces the number of wavelength converters required at each node, thus reducing system cost. Finally, we propose a backup path relocation scheme that migrates existing backup paths, whenever needed, to accommodate more primary paths and also to obtain primary routes with fewer hops. This is done to improve network utilization and reduce blocking probability. The proposed techniques are analyzed in detail using a discrete-event simulation model. The results show that significant reduction in blocking probability is possible with the proposed mechanisms. The number of converters required at each node to achieve a given blocking probability is also seen to be four times lower, compared to existing architectures based on static shortest path routing.

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A Survey of Survivability Techniques for Optical WDM Networks

Sivakumar

Shenai

Sivalingam

2005

Emerging Optical Network Technologies

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In an optical wavelength division multiplexed (WDM) network, link or node failures may result in huge amounts of lost data, due to the enormous fiber throughput. This requires that optical WDM network be designed to be resilient to failures. Thus, survivability can be defined as the ability to respond gracefully to such failures. This chapter presents a comprehensive survey of various mechanisms proposed to achieve survivability. The survey considers different topologies, different failure models, implementation issues, signaling issues and quality-of-protection issues. Keywords:Survivable Optical WDM Networks, Protection and Restoration, Single and dual-link failures, Node failures, Channel failures, Implementation, GMPLSbased Signaling, Quality of Protection. IntroductionOptical fiber based networks, characterized by a bandwidth of over 50 terabits per second (Tb/s), have emerged as the transmission medium of choice for high speed communication due to their capacity, reliability, cost and scalability. Recent advances in optical technology and in particular wavelength division multiplexing (WDM), a multiplexing technique that partitions the bandwidth provided by an optic fiber into individual multi-gigabit channels, have been identified as enabling technologies that will allows us to fully and effectively utilize the fiber capacity [1, 2]. Current optical technology demonstrations have shown a feasibility of 160 channels, each operating at 10 gigabits per second (Gb/s), and future networks are expected to operate at 40 Gb/s per channel or higher.

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<title>Restoration mechanisms based on tunable lasers for handling channel and link failures in optical WDM networks</title>

Cited by 7 publications

References 23 publications

Reduction of Blocking Probability in Restricted Shared Protected Optical Network using Alternate Path Routing and Wavelength Converter Placement

Reduction of Blocking Probability in Restricted Shared Protected Optical Network using Alternate Path Routing and Wavelength Converter Placement

Protection mechanisms for optical WDM networks based on wavelength converter multiplexing and backup path relocation techniques

A Survey of Survivability Techniques for Optical WDM Networks

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