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In wavelength-division multiplexing (WDM) optical networks, the bandwidth request of a traffic stream can be much lower than the capacity of a lightpath. Therefore, to utilize the network resources (such as bandwidth and transceivers) effectively, several low-speed traffic streams can be efficiently groomed or multiplexed into high-speed lightpaths, thus we can improve the network throughput and reduce...
In this paper we propose a methodology based on an evolutionary multiobjective optimization algorithm for the problem of up-grading (expansion) the physical topology of transparent optical networks. The aim is to define the new topology layout and the specification of the new optical devices that should be deployed in an existing network in order to improve its performance, considering simultaneously...
This paper addresses the topology design of hierarchical Hybrid Fiber-VDSL Access Networks (HFVANs). An efficient strategy is applied to find cost-effective and survivable optical distribution networks with metaheuristics in a short time. A novel metaheuristic with only few parameters, Yin-Yang Optimization (YYO), is proposed to solve this NP-hard problem. Its mathematic modeling and YYO-based algorithms...
The network coding paradigm has become an effective method for achieving efficient multicast in communication networks. The optical community has just started to venture into the application of network coding in optical networks. However, a number of challenges need to be overcome before network coding can be used in optical networks. These include limited buffering and processing capabilities as...
We present in this paper the study of electronic buffering in an innovative architecture for optical packet/burst switched network (OPSN). This architecture comprises optical bufferless nodes with electronic packet queuing out of the optical layer, deflection routing to perform contention resolution and fully connected mesh topologies under uniform traffic distribution. We demonstrate, by means of...
This paper investigates the problem of survivable multicasting in wavelength-division-multiplexing (WDM) optical mesh networks using optical-layer mixed-sharing protection. The term ldquomixed-sharingrdquo refers to that both the schemes of ldquoself-sharingrdquo and ldquocross-sharingrdquo are implemented to protect the multicast sessions. Each link on the primary tree(s) of a multicast session engrosses...
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