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With new optical transport systems able to provide sub-wavelength granularity, the dynamic characteristics of the network are expected to strongly increase. Furthermore, such properties are highly related to the underlying physical network topology, which in turn require from the control plane important features such as scalability, dynamism and automatism. In this paper we analyze the properties...
Future networks require virtual network topology management method using distributed PCEs for multi-layer multi-domain path computations. Once a path is established within a lower layer, it can be used as a data link in an upper layer and it can be advertised as a Traffic Engineering Link and exploited in the path computation by an upper layer. This paper presents cross-layer provisioning system architecture...
Link-disjoint routing strategy can offer a set of reliable alternate paths when the active best path fails. However, simply employing a set of fully disjointed paths may not necessarily result in the efficient network resource utilization in some circumstances, which degrades the performance of the network system under a highly loaded traffic condition. In this study, we propose two heuristic link-disjoint...
This work examines protection of multicast sessions in optical networks utilizing a novel segment-based algorithm called Level Protection. Our proposed scheme exhibits improved performance compared to other segment-based multicast protection schemes.
The rise of large-scale Data Centers to power the Internet infrastructure is driving new architectural directions for optical networking. This paper highlights these architectural options and discusses technology building blocks for scaling inter-Datacenter connectivity.
We propose a MILP based design model for energy reduction in IP over dynamic optical networks. By virtual topology reconfiguration, it can dynamically switch off unnecessary networking equipments, and reduce the power caused by over-provision. Simulation results indicate that the proposed design can significantly improve network energy performance.
Generalized Survivable Network (GSN) can improve the performance of Optical Flow Switched (OFS) network in short flow (<;1 sec) scenario. We solve the design problem of OFS network with GSN for arbitrary mesh topologies. The framework is generic and achieves significant savings compared with the typical algorithm.
United States, Europe and China is the emergence of the smart power grid construction, there is an urgent need to optimize the power optical fiber transmission network topology to meet the core services of the smart power grid reliability, real-time performance, connectivity, economy, etc. Combination analysis and evaluation methods of availability, network element ratio of optical path protection,...
The OTN over WDM network is one of the best solutions of the transmission network. How to manage the cross-connects capacity of the OTN node is a key problem in the OTN over WDM network. In this paper, an OTN over WDM numeric model is proposed to solve the OTN LIU placement problem. Based on the numeric model above, three multi-layer traffic grooming algorithms (OC-DKI, OC-DIK and OC-DIKP) are also...
This paper proposes an innovative self-managed optical network architecture for heterogenous transparent optical networks. A self-optimized dynamic network testbed that comprises multiple multi bit-rate ligthpaths on a mesh topology that utilizes a dark fiber link has been implemented and evaluated.
OCDM networks have a cycle attack caused by MAI propagation and disrupted network services. We describe a path establishment method constructed autonomously by logical tree topology to prevent this problem.
4 different core networks-including EU and US-are studied for bit-rate adaptive optical-OFDM w.r.t. restoration. The gained benefit over fixed bit-rate 40 Gb/s networks is found to be strongly mean path-length/mean connectivity dependent and reaches up to 42 % savings on OE-interfaces.
In a optical multidomain network, each domain needs to advertise its topology information to the other domains. Topology aggregation is an effective means to reduce the amount of the advertised topology information for each domain in large scale networks. The accuracy of aggregating the topology states is improved by using the approximation curves with limited amount of advertising topology information...
Partitioning a large network into a connected hierarchy is a proven technique for scalability, manageability, and reliability. Although a significant body of works is devoted to this area of interest, a reference to partitioning schemes where each partition remains 2-connected is missing. In optical networks, a failure of a physical component disrupts multiple logical links that share the component...
In this paper, we propose a deterministic greedy heuristic providing a construction layout for a cost-efficient multi-layer network that is able to carry a given set of traffic demands with and without protection on different layers. We apply the heuristic to different reference network topologies and protection requirements. Evaluations are conducted regarding equipment cost on different layers,...
We present a method to generate optical transport network topologies that preserve the major characteristics of real-world transport network topologies. We also present an heuristic based on a genetic algorithm that, combined with the topology generator, can be used to obtain the lowest cost topology in a multi-layer optical transport network. In order to deal with survivable networks, we derive expressions...
This paper addresses the system impact of fiber nonlinear crosstalk on ultra-dense hybrid coherent optical WDM optical network. Using Volterra theory, the transmission performance in terms of error vector analysis is evaluated and different contributions of nonlinear crosstalk are calculated. Firstly Volterra theory is validated against split-step Fourier simulations considering both intensity-modulated...
Since its emergence the internet has been a significant part of today's modern living. Defined by its interconnections and routing policies, it has fuelled increased demands for provisioning of new more advanced services that are able to dynamically react to changes within the network. These services however, lead to enormous energy consumption in contrast to a global drive for a greener environment...
Periodic reconfiguration of the virtual topology in transparent optical networks has been recently investigated as a mechanism to more efficiently adapt the network to predictable periodic traffic variations along the day or week. The scheduling of periodic reconfigurations should consider the trade-off between a lower network cost obtained through better resource allocation, and the undesired traffic...
The transmission of IP packets over WDM technology (IP-over-WDM) is expected to be the basic transmission framework of the next generation network. In this paper, a novel architecture of optical network is presented. The optical network control plane is responsible for tracking the network topology and the state of network resources, and for establishing, removing and maintaining connections. These...
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