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Space division multiplexing (SDM) over multi-core fiber (MCF) is advocated as a promising technology to overcome the capacity limit of the current single-core optical networks. However, employing the MCF for flexgrid networks necessitates the development of new concepts, such as routing, spectrum and core allocation (RSCA) for traffic demands. The introduction of MCF in the networks mitigates the...
Optical backbone networks are carrying enormous amount of traffic and therefore, network reliability performance is extremely important to minimize the service interruption time and loss of data. Besides, increasing energy consumption of the ICT sector makes network energy efficiency gain a lot of attention. Reducing the usage of components in the network is a promising strategy to both make network...
The paper presents architecture, implementation and evaluation of optical network function programmable node with hitless inter-function and intra-function switch-over. It supports multiple network functions on opto-electronic programmable hardware providing function-based virtualization and high network performance.
Architecture on demand (AoD) node offers considerable flexibility against traditional ROADMs. The paper presents a cost-efficient network planning strategy that exploits the flexibility inherent in AoD. Results show that AoD can save significantly in node modules through a proper network design.
Architecture design extensions for Time Shared Optical Network (TSON) are proposed for mobile backhaul. It introduces higher rates, flexible sub-lambda or lambda modes of operation, and dynamic memory allocation facilitating infrastructure virtualizat ion and reprogramming.
Novel hard-wired and synthetic ROADM architectures with self-healing capabilities are experimentally demonstrated. Simulation results show significant improvements of availability and recovery time due to node-level restoration, with reduced mean down time and operator revenue losses.
We introduce add/drop on demand (ADoD) architecture for ROADMs to provide higher flexibility and lower loss than current proposals. We quantitatively measure flexibility considering system's entropy and associate it with traffic uncertainty, upgradability, and resilience.
Software defined networking (SDN) and OpenFlow as the outcome of recent research and development efforts provided unprecedented access into the forwarding plane of networking elements. This is achieved by decoupling the network control out of the forwarding devices. This separation paves the way for a more flexible and innovative networking. While SDN concept and OpenFlow find their ways into commercial...
SDN/OpenFlow solutions have shown their strengths in datacenter, cloud and experimental environments. Currently there is a number of activities employing SDN concepts to other use cases. The ADDONAS project (Active Distributed & Dynamic Optical Network Access Systems) proposed to use SDN concept to support access to the services for the users and fair access to the resources for service providers...
This paper proposes a next generation ubiquitous converged infrastructure to support Cloud and mobile Cloud computing services. The proposed infrastructure facilitates interconnection of fixed and mobile end users with IT resources through a heterogeneous network integrating optical metro and wireless access networks. To support the Infrastructure as a Service paradigm, the proposed architecture adopts...
The current generation of optical networks based on a fixed wavelength grid and on fixed-rate transponders would impose relevant limitations for future transmission rates exceeding 100 Gb/s, thereby limiting the number of potential implementations and making a new generation of elastic optical networks (EON) necessary. To this regard, flexible-grid (Flexgrid) transmission and switching technologies...
Elastic Optical Networking (EON) is a solution that promises to improve infrastructure utilisation by implementing flexible spectrum allocation with small spectrum slots instead of the rigid 50-GHz fixed grid of current DWDM deployments. This new EON flexible grid supports Bandwidth Variable Transponders (BVT) that can tune their bit rate and bandwidth dynamically with a trade off between reach and...
Architecture on Demand (AoD) can provide self-healing at the optical node level due to its flexibility and the ability to employ idle components for failure recovery. We study the impact of AoD on network availability at different traffic switching granularities, showing significant improvements compared to traditional static node architecture.
This paper reports on architectural and performance analysis of online re-purposed networks built with programmable data and control plane for Fixed and Flex-Grid communication. The studies demonstrate the effect of node placement strategies on performance, the impact of routing and resource allocation mechanisms, and the corresponding trade offs.
The stochastic nature and power fluctuations of renewable energy sources are two major parameters affecting the stability of the power grid. Traditionally, this issue has been addressed through energy storage elements i.e. batteries, having the disadvantages of increased cost and limited operational lifetime. In this paper, it is argued that a cost effective solution to this problem is to orchestrate...
The paper presents analytical and simulation availability models for evaluation of optical node availability. Analytical models are developed for six ROADM (reconfigurable optical add and drop multiplexers) architectures. Availability/cost figures are calculated, compared and discussed. For one of ROADMs simulation model is created and Monte Carlo simulation of times to failure and times to repair...
A novel application-aware virtual data centre (VDC) provisioning method for distributed data centres (DCs) enabled by coordinated virtualization of optical OFDM network and DCs is proposed. Furthermore, an adaptive VDC replanning method, supporting virtual topology shifting for accommodating DCs traffic variations, is proposed.
Optical Orthogonal Frequency Division Multiplexing (O-OFDM) is an attractive transport technology for virtualization of optical networks. In this paper, we propose a novel Integer Linear Programming (ILP) formulation and a scalable efficient heuristic algorithm for online virtualization in an optical network utilizing O-OFDM.
Architectures that enable the deployment of large-scale Networked Media Infrastructures (NMIs) to support the increasingly diverse range of media applications, as well as the demand for delivery of user-aware media services have become a necessity. Key to the design of such architectures is the implementation of NMIs that are flexible and support reusability of distributed resources. There is also...
Future Internet services are characterized by global delivery of heterogeneous network-based applications over high performance dynamic networks. To meet these applications needs, architectural enhancements and changes in the current Internet are essential. However, since there exists multiple stakeholders in the current Internet, it is almost impossible to reach an agreement among them on necessary...
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