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Optical Transport Network

About: Optical Transport Network is a research topic. Over the lifetime, 6055 publications have been published within this topic receiving 85783 citations.


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Journal ArticleDOI
TL;DR: The major advances toward the goal of developing an extensive optical packet-switched layer employing fixed-length packets are summarized, but initial concepts on the support of variable-length IP-like optical packets are also introduced.
Abstract: Wavelength-division multiplexing is currently being deployed in telecommunications networks in order to satisfy the increased demand for capacity brought about by the explosion in Internet use. The most widely accepted network evolution prediction is via an extension of these initial predominantly point-to-point deployments, with limited system functionalities, into highly interconnected networks supporting circuit-switched paths. While current applications of WDM focus on relatively static usage of individual wavelength channels, optical switching technologies enable fast dynamic allocation of WDM channels. The challenge involves combining the advantages of these relatively coarse-grained WDM techniques with emerging optical switching capabilities to yield a high-throughput optical platform directly underpinning next-generation networks. One alternative longer-term strategy for network evolution employs optical packet switching, providing greater flexibility, functionality, and granularity. This article reviews progress on the definition of optical packet switching and routing networks capable of providing end-to-end optical paths and/or connectionless transport. To date the approaches proposed predominantly use fixed-duration optical packets with lower-bit-rate headers to facilitate processing at the network-node interfaces. Thus, the major advances toward the goal of developing an extensive optical packet-switched layer employing fixed-length packets are summarized, but initial concepts on the support of variable-length IP-like optical packets are also introduced. Particular strategies implementing the crucial optical buffering function at the switching nodes are described, motivated by the network functionalities required within the optical packet layer.

266 citations

Proceedings ArticleDOI
Prabhakar Raghavan1, Eli Upfal1
23 May 1994
TL;DR: This work presents licient routing techniques for the two types of photonic switches that dominate current research in all-optical networks, and studies the problem of routing a set of requests on sparse networks using a limited number of wavelengths.
Abstract: Communication in all-optical networks requires novel routing paradigms. The high bandwidth of the optic fiber is utilized through wavelengthdivision multiplexing: a single physical optical link can carry several logical signals, provided that they are transmitted on different wavelengths. We study the problem of routing a set of requests (each of which is a pair of nodes to be connected by a path) on sparse networks using a limited number of wavelengths, ensuring that different paths using the same wavelength never use the same physical link. The constraints on the selection of paths and wavelengths depend on the type of photonic switches used in the network. We present eflicient routing techniques for the two types of photonic switches that dominate current research in all-optical networks. Our results es*IBM T.J. Watson Research Center, Yorktown. This work was supported in part by grant MDA 97292-C-0075 from ARPA. t The Weizmann Institute, Israel, and IBM Alrnaden Research Center, California. Work at the Weizmann Institute supported in part by the Norman D. Cohen Professorial Chair of Computer Science. Permission to co y without fee all or part of this material is granted provicf~hatthecopies are not madeorcfistrfbutedfor direct commercial advantage, the ACM copyright notice and the title of the publication and its date appear, and notice is given that copying is by permission of the Association of Computing Machinery. To copy otherwke, or to republish, requires a fee andJor specific permission. STOC 945/84 Montreal, Quebec, Canada (!3 1984 ACM 0-89791 -663-6/94/0005.. $3.50 tablish a connection between the expansion of a network and the number of wavelengths required for routing on it.

251 citations

Journal ArticleDOI
TL;DR: This article provides a perspective on optical layer protection and restoration based on the services offered by carriers using the optical layer, which provides a way to distinguish between protection schemes based on implementation costs and the associated services enabled by the protection scheme.
Abstract: This article provides a perspective on optical layer protection and restoration based on the services offered by carriers using the optical layer. This is different from other viewpoints that provide a taxonomy of protection techniques in a more abstract fashion for the purposes of standardization. The latter viewpoints are mostly based on the classification adopted in the SONET/SDH standards. In contrast, taking a services-based view provides a way to distinguish between protection schemes based on implementation costs and the associated services enabled by the protection scheme.

244 citations

Journal ArticleDOI
TL;DR: A conservative estimate of the "fiber channel" capacity in an optically routed network is presented and it is shown that the fiber capacity per unit bandwidth for a given distance significantly exceeds current record experimental demonstrations.
Abstract: The instantaneous optical Kerr effect in optical fibers is a nonlinear phenomenon that can impose limits on the ability of fiber-optic communication systems to transport information. We present here a conservative estimate of the "fiber channel" capacity in an optically routed network. We show that the fiber capacity per unit bandwidth for a given distance significantly exceeds current record experimental demonstrations.

243 citations

Journal ArticleDOI
TL;DR: This article summarizes in a systematic way the main OBS design parameters and the solutions that have been proposed in the open literature and shows how the framework achieves high traffic throughput and high resource utilization.
Abstract: Optical burst switching is a promising solution for all-optical WDM networks. It combines the benefits of optical packet switching and wavelength routing while taking into account the limitations of the current all-optical technology. In OBS, the user data is collected at the edge of the network, sorted based on a destination address, and grouped into variable sized bursts. Prior to transmitting a burst, a control packet is created and immediately sent toward the destination in order to set up a bufferless optical path for its corresponding burst. After an offset delay time, the data burst itself is transmitted without waiting for a positive acknowledgment from the destination node. The OBS framework has been widely studied in the past few years because it achieves high traffic throughput and high resource utilization. However, despite the OBS trademarks such as dynamic connection setup or strong separation between data and control, there are many differences in the published OBS architectures. In this article we summarize in a systematic way the main OBS design parameters and the solutions that have been proposed in the open literature.

242 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202237
202132
202060
201998
201884