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This paper addresses offline virtual topology design in transparent optical networks under given periodic traffic. We call this planning problem ldquoScheduled Virtual Topology Designrdquo. Two problem variants are considered: for a network based on non-reconfigurable equipment and for a network based on reconfigurable equipment. Two MILP (Mixed Integer Linear Program) formulations are proposed, one...
In optically powered networks, glass fibres are used for transmitting optical communication signals as well as optical energy for electrically powered devices. Advantages over existing power delivery technologies are: immunity to electromagnetic interference, spark-free power for safety-critical applications, slim cables, simple installation and reduced maintenance cost. Applications relate to security...
In two-layer networks there are various ways to improve virtual and physical topology and capacity allocations in terms of cost. One way is introducing bypass links, to reduce the amount of switching in the upper layer. Our approach for finding the bypass links and the corresponding bypass nodes is based on a mixed integer programming approach. Our starting point is a network without bypass functionality...
As an extension of the known light trail and light tree techniques, we explore the most possible general setting of time division multiplexing in circuit switched all optical networks. It will be shown that this technique improves the scalability and adaptability of all-optical networks without the need of expensive techniques like wavelength converters and burst switching or packet switching capable...
The increasing demand for higher bit rates in access networks requires fibre deployment closer to the customer since bit rates in copper based access networks are strictly limited by the length of the copper cables. Besides higher access bit rates optical access network technologies enable extended distances between the network terminal at the customer premise and the line port at the access node...
The interoperability of wireless and PON networking solutions is investigated to reduce deployment expenditure by means of centralised network management while providing ubiquitous access connections and mobility. Network modelling in the physical layer of WiMAX channel transmission based on FDM over legacy PONs has demonstrated EVMs below -30 dB and error-free multipath transmission. In addition,...
Automatically switched multilayer IP-over-optical networks offer extensive flexibility in coping with offered traffic. Multilayer traffic engineering (MLTE) takes advantage of this through online IP logical topology reconfiguration in addition to the more traditional rerouting. Although MLTE typically optimizes towards resource usage, bandwidth throughput and QoS performance, energy efficiency has...
We propose a linear formulation for traffic routing in optical networks after the virtual topology design (VTD). The formulation maximizes the amount of traffic the network is able to accept, through minimizing the residual capacity in established lightpaths. The results suggest that it is feasible to preserve enough open capacity to avoid disruption of connections and blocking of future traffic demands...
This paper proposes a regenerator placement algorithm specifically designed for dynamic translucent optical networks, where lightpaths are dynamically routed along one of the multiple paths connecting each source destination pair. Just topology and physical layer information is exploited, while no traffic prediction is required.
Optical burst switching (OBS) was proposed as an alternative optical switching paradigm, in order to overcome the limitations of optical circuit and optical packet switching paradigms. In OBS networks, resource reservation protocol plays a key role for better resource allocation along the path from source to destination data transmission. In this paper, we focus and consider some of the relevant one-way...
For a given network physical topology and traffic pattern, our objective is to design the logical topology and the routing algorithm on that topology so as to minimize the Congestion. The virtual topology design problem is a mixed integer linear formulation. Heuristic algorithms for this problem where suggested to relax MILP problem such as Heuristic Topology Design Algorithm (HLDA), the minimum-delay...
The differentiation of resilience services to meet the requirements of different traffic types is a major architectural and design issue. This paper investigates the problem of differentiated resilience for wavelength-division multiplexing (WDM) networks with dynamic traffic grooming. Traffic grooming supports efficient utilization of network resources by allowing sub-wavelength granularity connections...
An important problem in optical networking is to dimension the network: given the amount of traffic to carry, determine the required amount of network resources (wavelengths). In traditional scenarios, the traffic is specified in terms of a source-destination based traffic matrix. In an optical Grid scenario however, the anycast principle applies: users submit jobs, and generally do not care where...
In this paper, we present a survey comparing different deflection routing based techniques applied to optical burst switching (OBS) networks. For such study we consider the E-OBS architecture proposed in which is an advantageous solution for OBS networks since routing decision can be taken freely inside the network without constraints on the length of the path. Under this environment, several effective...
Recent proposals for next generation FTTH PONs add the WDM dimension to the current TDM G/E-PONs, to reach an order of magnitude increase in terms of served bandwidth and number of served users. It is usually performed by introducing a trunk WDM MUX, replicating the tree topology. In search of higher scalability and trunk protection, an alternative implementation of the hybrid WDM/TDM-PON consists...
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