Transparent vs. opaque vs. translucent wavelength-routed optical networks

Ramamurthy, Byrav; Feng, H.X.C.; Datta, Debasish; Mukherjee, B.

doi:10.1109/ofc.1999.767791

Cited by 95 publications

(74 citation statements)

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“…In this manner, LBSs can achieve a uniform aggregated (and thus simplified) access to lower layers. Let us note that other different research fields use "translucency" to name the flexible combination of both visibility and transparency: for instance, [19] and [20] adopt the translucent term to indicate similar hybrid visibility in the area of optical networks.…”

Section: Posim Objectives and Guidelines Of Solutionmentioning

confidence: 99%

The PoSIM middleware for translucent and context-aware integrated management of heterogeneous positioning systems

Bellavista¹,

Corradi²,

Giannelli³

2008

Computer Communications

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Section: Posim Objectives and Guidelines Of Solutionmentioning

confidence: 99%

The PoSIM middleware for translucent and context-aware integrated management of heterogeneous positioning systems

Bellavista¹,

Corradi²,

Giannelli³

2008

Computer Communications

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“…The traditional fixed-grid Wavelength Division Multiplexing (WDM) or the recently available flexgrid technology [10] can be used to create express Gb/s optical connections, also called lightpaths. Authors in [11] compare the performance transparent/translucent vs. opaque optical networks and conclude that for medium-scale networks translucency improves network performance. However, higher degree of opacity may be needed for larger-scale networks.…”

Section: Introductionmentioning

confidence: 99%

ABNO-driven content distribution in the telecom cloud

Gifre

Tornatore

Contreras

et al. 2017

Optical Switching and Networking

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Abstract-As current sustained traffic growth is expected to strain capacity of today's metro network, novel content distribution architectures where contents are placed closer to the users are being investigated. In that regard, telecom operators can deploy datacenters (DCs) in metro areas, thus reducing the impact of the traffic going from users to DCs. However, effective solutions to distribute contents to those metro DCs and to synchronize contents among them need to be investigated. In this paper, a hierarchical content distribution architecture for the telecom cloud is investigated: core DCs placed in geographically distributed locations, are interconnected through permanent "per content provider" (CP) virtual network topology (CP-VNT); additionally, metro DCs are placed close to users, and need also to be interconnected with the core DCs. CP's data is replicated in the core DCs through the CP-VNT, while metro-to-core (M2C) anycast connections are established periodically for metro DCs to synchronize contents. Since failures in the interconnection network might disconnect the CP-VNTs, in this paper recovery mechanisms are proposed to reconnect topologies and anycast connections. Topology creation, anycast provisioning and recovery problems are first formally stated and modelled as Integer Linear Programs (ILP). Solving these models, however, becomes impractical for realsized scenarios, so heuristic algorithms are also proposed. Exhaustive simulation results show that the investigated architecture provides significant improvements in both supported traffic and restorability compared to the case of a single core DC. Workflows to implement the algorithms within the Applications-based Network Operations (ABNO) architecture and extensions for PCEP are proposed. Finally, the architecture is experimentally validated in our ABNObased iONE test-bed.Keywords: Datacenter interconnection, Optical networks, Content distribution. INTRODUCTIONCloud-based contents are experiencing an exponential growth in users and data volume. In [1], Cisco forecast a yearly global growth of 23% in datacenter (DC)-to-user traffic, 29% in DC-to-DC traffic, and 22% in the intra-DC traffic. Likewise, Alcatel-Lucent highlights that metro traffic will increase 560% by 2017 mainly driven by IP video and cloud traffic [2], growing two times faster than core network traffic. They conclude that placing contents in DCs closer to users can result in a 41% bandwidth reduction in the metro networks. The resulting distributed DC architecture should come together with the extension of the core network functionalities towards the metro, as proposed in [3].Robust telecom infrastructures are needed to minimize the impact of failures on the services [4]; this is especially relevant in the case of video distribution. In fact, prolonged service outages and disruptions have negatively impacted the confidence of important companies toward cloud environments. Telecom operators are in a vantage position to capitalize on highly-reliable cloud services since they o...

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“…Optical-Electronic (O/E) and Electronic-Optical (E/O) conversion may be indispensable for the control of optical networks. Our research focuses on the efficient utilization of regeneration resources in optical networks [1]. This study * This work was supported in part by NSF grants (ANI-0074121 and EPS-0091900).…”

Section: Introductionmentioning

confidence: 99%

Dynamic routing in translucent WDM optical networks

Yang

Ramamurthy

2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333)

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Abstract-Translucent WDM optical networks use sparse placement of regenerators to overcome the impairments and wavelength contention introduced by fully transparent networks, and achieve a performance close to fully opaque networks with much less cost. Our previous study proved the feasibility of translucent networks using sparse regeneration technique. We addressed the placement of regenerators based on static schemes allowing only fixed number of regenerators at fixed locations. This paper furthers the study by proposing a suite of dynamical routing schemes. Dynamic allocation, advertisement and discovery of regeneration resources are proposed to support sharing transmitters and receivers between regeneration and access functions. This study follows the current trend in optical networking industry by utilizing extension of IP control protocols. Dynamic routing algorithms, aware of current regeneration resources and link states, are designed to smartly route the connection requests under quality constraints. A hierarchical network model, supported by the MPLS-based control plane, is also proposed to provide scalability. Experiments show that network performance is improved without placement of extra regenerators.

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Transparent vs. opaque vs. translucent wavelength-routed optical networks

Cited by 95 publications

References 1 publication

The PoSIM middleware for translucent and context-aware integrated management of heterogeneous positioning systems

The PoSIM middleware for translucent and context-aware integrated management of heterogeneous positioning systems

ABNO-driven content distribution in the telecom cloud

Dynamic routing in translucent WDM optical networks

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