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The Internet explosion has drastically increased the bandwidth demand of modern telecommunication networks and as optical networks provide an opportunity for the future Internet, it is expected that Internet providers will gradually replace their infrastructures with optical networks. The Internet is a decentralized set of networks (more than 29.000) known as domains or Autonomous Systems on a well-known...
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...
Optical Transport Network (OTN) is a standard approach to offering transport support to a variety of existing service technologies, e.g., ESCON, HDTV, GE, etc. Multiple service technologies can be concurrently multiplexed onto one common transport network, which offers hierarchical transmission rate wrappers physically supported by Wavelength Division Multiplexing (WDM) lambda channels. Algorithms...
Optical network design problems fall in the broad category of network optimization problems. We give a short introduction on network optimization and general algorithmic techniques that can be used to solve complex and difficult network design problems. We apply these techniques to address the static Routing and Wavelength Assignment problem that is related to planning phase of a WDM optical network...
Routing and Wavelength Assignment (RWA) problem in Wavelength Division Multiplexed (WDM) optical networks assumes assigning the routes and wavelengths to be used to create the lightpaths on behalf of the connection requests. The RWA problem belongs to the class of combinatorial optimization problems. The optimal solution to the RWA problem is found to be NP-hard and thus suited to heuristic approaches...
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...
We propose a novel outer-ROADM-ring (ORR) based multi-domain routing scheme in optical WDM networks. Results show that this scheme has both high scalability and low blocking probability, while preserving inter-domain confidentiality as well.
A novel multi-domain path routing solution is proposed for improving connection reliability under multiple correlated failure events. The formulation assumes probabilistic failures and jointly incorporates traffic engineering objectives.
A Wavelength-Aware approach for Translucent design and dynamic routing is presented. Compared to the Wavelength-UnAware worst-case design scenario, up to 100% reduction on OEO interfaces has been found.
Optical routing technologies will surely be the key to creating future bandwidth abundant and green networks. Considering future services and the need to create virtual fiber networks, the introduction of wavebands is a next important step.
We propose dynamic routing and spectrum assignment algorithms for bitrate-flexible lightpaths in OFDM-based optical networks. The novel algorithms enable dynamic spectrum assignment with more efficient resource utilization and less traffic blockings.
A multi-layer grooming and routing method, which considers the optical layer constraints, is proposed. This method, based on a new modeling, allows significant resource saving with respect to a layer by layer approach.
Orthogonal Frequency Division Multiplexing (OFDM) has been recently proposed as a modulation technique for optical networks, due to its good spectral efficiency and impairment tolerance. Optical OFDM is much more flexible compared to traditional WDM systems, enabling elastic bandwidth transmissions. We consider the planning problem of an OFDM-based optical network where we are given a traffic matrix...
Presented in this paper is a dual routing engine-enabled optical network platform with multi-domains and multi-layers. Structure and key technologies of the platform are outlined. Experiments on it with 2 routing strategies are conducted, the results are discussed and the network scalability is evaluated.
Most research works in optical burst switching (OBS) networks do not take into account the impact of physical layer impairments (PLIs) either by considering fully transparent (i.e., using optical 3R regeneration) or opaque (i.e., electrical 3R regeneration) networks. However, both solutions are not feasible for different reasons. In this paper, we propose a novel translucent OBS network architecture...
When multicasting in optical networks is implemented within the switching control plane, it combines the efficiency of multicast trees along with the high speed and low delay of optical communications. Multicast nodes must be equipped with light splitters. Light splitters are expensive equipment. Therefore, a limited number of optical nodes will have this splitting capability. A good placement of...
Hybrid wireless optical broadband access networks are the future of internet service providers. Due to high capacity and flexibility, they are the most promising architecture for last mile internet access. Addressing the fact that deployed radios in the wireless part of WOBAN are under-utilized in current routing algorithms, half of the links remain idle while few of these links are carrying traffic,...
The properties found in complex networks (e.g., small-world, scale-free) have been used to characterize the behaviour of several processes such as epidemics or oscillators. We analyze the impact of such properties on the quality of a routing process. Using a Mixed Integer/Linear Program, the routing minimizes the number of ports installed in a previously designed network. Ports are network components...
Different routing schemes for multi-layer and multidomain optical networks are analyzed, and a novel routing architecture is described in the paper. Cooperation models between dual routing engine in large-scale multi-layer and multidomain optical networks are researched, and an optimal model is proposed and simulated. Then the scalability of dual routing engine architecture is validated on DRE testbed.
The combination of deflection routing and burst retransmission is an attractive scheme for resolving the burst contention problem in Optical Burst Switching (OBS) networks. Most of previous works on hybrid schemes use simulation approach to prove the efficicency. In this paper, we develop an analytical model for obtaining the overall burst loss ratio of an OBS network that take into account deflection...
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