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A hierarchical cache architecture for the telecom cloud is investigated. Intermediate cache (IC) nodes, placed in geographically distributed datacenters, are interconnected through permanent “per content provider” (CP) virtual network topologies (CP-VNT), whilst leaf cache (LC) nodes are placed close to users. CP's video contents are replicated in the IC nodes through the CP-VNTs, whilst LC-to-IC...
Our aim in this work is to characterize experimentally the transmission properties of a 19-core plastic optical fiber and to compare them to those obtained for several single-core POFs under the same conditions. Thus, we measured frequency response, attenuation and angular output power distribution as functions of fiber length under different configurations. Additionally, measurements of parameters...
This paper describes our current research in optical transmission technology targeting to overcome the capacity limitations in high-bitrate optical data links. In particular, the enabling steps taken towards multidimensional multiplexing (M2) transmission schemes for transmission in multicore fiber are described. The development of an integrated device capable of performing mode conversion for modal...
Plastic Optical Fibres (POF) have now been a well-established media for transporting high-speed at low cost in short distance communications systems, and avionics is the latest segment where these fibers are becoming an important factor. In fact, the POF's flexibility and ease of installation make this fiber a great option for the replacement by fiber of some of the existing aircraft data links. We...
We analyze the recently proposed Extended Passive-Optical-Pod Interconnect (e-POPI), designed for small energy-aware data centers, including server-turn-on/off strategies. We investigate several options to increase up to 56 Gbit/s the bit rate of e-POPI's links by the use of Pulse Amplitude Modulation (4 or 8 PAM) considering three types of receivers (including SOA-PIN). The maximum number of connected...
5G technologies are a new paradigm strongly supported by the European Commission (EC) to overcome the challenges of next generation networks and aiming to tackle the novel and manifold business requirements of vertical sectors such as Industry 4.0, Smart Grids, Smart Cities, and eHealth. Extraordinarily high speeds and capacity, multi-tenancy, fixed and wireless access network convergence, self-X,...
Incremental planning is performed periodically to decide how a backbone optical network has to be updated to serve the forecast traffic during the next planning period. Based on reliable traffic prediction, new equipment is installed and its capacity is ready to be used. Nonetheless, due among others to the introduction of new services, exact prediction is not usually available, which leads to install...
Some characteristics of optical networks can be assessed by analyzing the topology of the network. Many metrics can be used for this purpose. Modularity indicators were already proposed to study complex networks, and they have been useful to clarify many real world problems. In this paper, we propose an indicator inspired in the traditional modularity concept aiming at finding suitable routes in optical...
The paper proposes a resources allocation method for EON based on a modified RDM using squatting and kicking strategies in order to prioritise the usage of channels and enhancing the total utilisation. It can also be used as an admission control. The mechanism is described and compared to existing proposals, regarding the flexibility in the allocation per class. The strategy regards the EON constraints...
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