Mirosław Klinkowski

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Flexgrid optical networks are attracting huge interest due to their higher spectrum efficiency and flexibility in comparison with traditional wavelength switched optical networks based on the wavelength division multiplexing technology. To properly analyze, design, plan, and operate flexible and elastic networks, efficient methods are required for the(More)
—Optical burst switching (OBS) control architecture considers two different models for the management of the offset time in the network. The conventional OBS (COBS) introduces the offset time in soft-way by delaying the transmission of the burst relative to its control packet in the edge node. Another idea for an OBS architecture (E-OBS) comes from optical(More)
—In translucent optical networks, the physical layer impairments degrading the optical signal are considered in the network planning. In this paper, we investigate the offline problem of routing and wavelength assignment (RWA) and regenerator placement (RP) in translucent networks, minimizing the lightpath blocking and regenerator equipment cost. We address(More)
Finding optimal routes and spectrum allocation in flexgrid optical networks, known as the RSA problem, is an important design problem in transport communication networks. The problem is $$\mathcal{NP }$$ NP -hard, and its intractability becomes profound when network instances with several tens of nodes and several hundreds of demands are to be solved to(More)
The problem of burst losses in OBS networks has an impact on the service quality perceived by end users. In order to guarantee certain level of Service Quality (QoS) in terms of burst losses, wavelength resources have to be dimensioned properly. In this paper, we address the problem of the Virtual Topology (VT) design that concerns the establishment of(More)
Translucent optical networks are considered as a promising solution for reducing the electronic processing overhead of opaque optical networks thanks to a cost-effective use of regenerator resources. In a translucent Elastic Optical Network (EON), in which each transparent segment of an optical path may have different spectrum requirements, the use of(More)
—From the network layer perspective, the problem of burst losses is one of the most challenging problems which restrain the development of Optical Burst Switching (OBS) networks. Indeed, OBS is a buffer-less technology and the consequent lack of guarantees for data delivery may affect significantly the service quality (QoS) perceived by end users. To(More)
In the paper we present a branch and price approach to routing and spectrum allocation – a basic optimization problem in elastic optical networks. We formulate the problem as a mixed-integer program for which we develop a branch and price algorithm enhanced with such techniques as cutting planes for improving lower bounds for the optimal objective value,(More)
The introduction of sub-wavelength switching is one of the main objectives of the future transparent optical mesh networks. One strong candidate is Optical Burst Switching (OBS) which improves the resource utilisation by setting up very short lived circuits (bursts). Nonetheless, introducing optical transparency in the optical layer has an important impact(More)