ABSTRACT National IP/multiprotocol label switching (MPLS) networks have been designed using a multilayer approach to take advantage of the optical layer's longer reach. In that approach, the IP/MPLS layer performs routing and flow... more
ABSTRACT National IP/multiprotocol label switching (MPLS) networks have been designed using a multilayer approach to take advantage of the optical layer's longer reach. In that approach, the IP/MPLS layer performs routing and flow aggregation, whereas the optical layer, based on wavelength division multiplexing technology, transports those aggregated flows into optical connections. However, the flexgrid technology, featuring a finer granularity, also allows the performance of grooming at the optical layer, and hence, the aggregation level of the incoming flows can be reduced. Taking advantage of that fact, in this paper we propose a new network architecture consisting of a number of IP/MPLS areas performing routing and aggregating flows to the desired level and a flexgrid-based core network connecting the areas among them. A two-step procedure to design the whole network is presented where locations are first partitioned into a set of areas, and then each area network and the flexgrid core is designed separately. Mixed-integer linear programming models are developed for the resulting optimization problems. Solving these models, however, becomes impractical for real-sized scenarios so evolutionary heuristics based on the biased random-key genetic algorithm framework are also proposed. Extending the core toward the edges results in significant savings in both the core and IP/MPLS networks.
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ABSTRACT Digitally processed modulations formats such as Nyquist-WDM are investigated for implementation of future flexible optical networks, by using integrated photonic devices and moderate speed optoelectronics. We compare with other... more
ABSTRACT Digitally processed modulations formats such as Nyquist-WDM are investigated for implementation of future flexible optical networks, by using integrated photonic devices and moderate speed optoelectronics. We compare with other modulation formats as OFDM regarding complexity and adaptability to transceiver limitations.
Research Interests: Electronic Engineering, Computer Science, Optical Fiber Communications, Wireless Communications, Photonics, and 9 moreOptical Networks, OFDM, Optical Communications, WDM Optical Networks, Wavelength Division Multiplexing, Integrated Photonics, Semiconductor optical amplifiers, Orthogonal Frequency Division Multiplexing, and Nyquist WDM
Page 1. Characterization of Fast and Power Efficient Optical OFDM Transmission System Based on Hartley Transform Michela Svaluto Moreolo*, Josep Maria Fabrega, Gabriel Junyent Centre Tecnològic de Telecomunicacions de Catalunya (CTTC),... more
Page 1. Characterization of Fast and Power Efficient Optical OFDM Transmission System Based on Hartley Transform Michela Svaluto Moreolo*, Josep Maria Fabrega, Gabriel Junyent Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), Av. ...
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Research Interests: Physics, Optics, Telecommunication, Optical physics, Faraday Rotation, and 13 moreHigh Speed, Single Mode Fiber, Optical Fibre Communication, Optical Fibres, Insertion Loss, Electrical And Electronic Engineering, Faraday Effect, Optical Fibre Polarisation, State of Polarization, Frequency shift keying, Faraday Cage, Polarization controller, and Low loss
Research Interests: Computer Science, Distributed Computing, Resource Allocation, Computer Network, Non Functional Requirement, and 8 moreReal Time, Physical Impairment, Hybrid Approach, Provisioning, Wavelength Division Multiplexing, IEEE Communications Magazine, Electrical And Electronic Engineering, and Function Block
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During the last few years there has been a trend for organizations such as universities, hospitals, schools, and big corporations to buy their own fiber and point-to-point links from different sup-pliers [1, 2]. These organizations would... more
During the last few years there has been a trend for organizations such as universities, hospitals, schools, and big corporations to buy their own fiber and point-to-point links from different sup-pliers [1, 2]. These organizations would like to manage these resources as part of ...
Research Interests: Engineering, Computer Science, Distributed Computing, Service Oriented Architecture, Computer Networks, and 15 moreSoftware Architecture, Middleware, Computer Network, Federal Government, IEEE, Network Virtualization, Next Generation, Multi Domain, Network Topology, IEEE Communications Magazine, Services Computing, Communications, Electrical And Electronic Engineering, Application Virtualization, and Next generation networking
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ABSTRACT In this paper, we propose low complexity bit rate variable transponders for adaptive DC biased Optical OFDM systems. The transponders are based on an alternative transform, the fast Hartley transform (FHT), and use adaptively... more
ABSTRACT In this paper, we propose low complexity bit rate variable transponders for adaptive DC biased Optical OFDM systems. The transponders are based on an alternative transform, the fast Hartley transform (FHT), and use adaptively modulated O-OFDM (AMO-OFDM) to introduce flexibility to optical networks. Additionally, low complexity selective mapping (LC-SLM) technique is included in the bit rate variable transponders to mitigate the effects of the peak-to-average power ratio (PAPR) and reduce the clipping noise, enabling the use of low bias values.
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ABSTRACT A characterization of a phase modulated coherent optical OFDM system based on Hartley transform is performed. The use of phase modulation minimizes OFDM amplitude fluctuations, resulting in reduced peak-to-average power ratio.... more
ABSTRACT A characterization of a phase modulated coherent optical OFDM system based on Hartley transform is performed. The use of phase modulation minimizes OFDM amplitude fluctuations, resulting in reduced peak-to-average power ratio. Also, it is based on Hartley transform for simplifying the signal processing. In this paper, theoretical models are developed for describing the behavior of the system when it is limited by the receiver sensitivity and when optical amplification noise is dominating. For both cases, the resulting models are validated by means of extensive simulations.
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Currently, GMPLS is being developed as a standard in order to introduce intelligence for next-generation ASON (automatically switched optical network) by means of a distributed optical control plane, allowing, among other functionalities,... more
Currently, GMPLS is being developed as a standard in order to introduce intelligence for next-generation ASON (automatically switched optical network) by means of a distributed optical control plane, allowing, among other functionalities, dynamic and real-time provisioning of high-bandwidth optical connections. The provisioning of bidirectional optical connections over unidirectional OADM (optical add drop multiplexer) rings using a distributed GMPLS-based control plane
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Advance Reservation Algorithm for Service Oriented Optical Networks Eduard Escalona, Salvatore Spadaro, Jaume Comellas, Gabriel Junyent Optical Communications Group, TSC Dept., Universitat Politècnica de Catalunya, C ... 1 2 3 4 5 6 7 8 9... more
Advance Reservation Algorithm for Service Oriented Optical Networks Eduard Escalona, Salvatore Spadaro, Jaume Comellas, Gabriel Junyent Optical Communications Group, TSC Dept., Universitat Politècnica de Catalunya, C ... 1 2 3 4 5 6 7 8 9 10 IR P reem tio n Pro b a b ility ...
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The paper presents the performance evaluation of an optical network using a simple optical cross-connect (OXC) architecture, with fixed wavelength conversion. The main advantage of a network using this OXC is the absence of any tunable... more
The paper presents the performance evaluation of an optical network using a simple optical cross-connect (OXC) architecture, with fixed wavelength conversion. The main advantage of a network using this OXC is the absence of any tunable components in the nodes. Obtained results show that networks with this OXC design approach the behavior of networks with ideal OXCs.
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ABSTRACT We propose a new recovery scheme, called multi-path recovery (MPR), specifically designed for flexgrid-based optical networks. It combines protection and restoration schemes to jointly recover, in part or totally, the bitrate... more
ABSTRACT We propose a new recovery scheme, called multi-path recovery (MPR), specifically designed for flexgrid-based optical networks. It combines protection and restoration schemes to jointly recover, in part or totally, the bitrate requested by client demands in case of failure. We define the bitrate squeezed recovery optimization (BRASERO) problem to maximize the amount of bitrate which is recovered in case of failure of any single fiber link; a mixed integer linear programming formulation for the BRASERO problem is provided. However, since their exact solutions become impractical when real-sized network and traffic instances are considered, we develop a heuristic algorithm which provides a much better trade-off between optimality and complexity. Exhaustive numerical experiments carried out over realistic network topologies and traffic scenarios show that the efficiency of the proposed MPR scheme approaches that of restoration while providing recovery times as short as protection schemes.
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ABSTRACT A comparison between an optical network node working under the circuit switching or the burst switching paradigms is made. Different statistical distributions for the generated traffic are analyzed and, by means of simulations,... more
ABSTRACT A comparison between an optical network node working under the circuit switching or the burst switching paradigms is made. Different statistical distributions for the generated traffic are analyzed and, by means of simulations, results on the node capacity are obtained. ...
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Research Interests: Computer Science, Iterative Methods, Linear Programming, Integer Programming, Resource Allocation, and 15 moreOptical Communication, Optical Networks, Computer Model, Optical network, Decision making process, Mathematical Model, Net Present Value, Optical fiber, Network Topology, Resource Utilization, Core Network, Telecommunication Services, Objective function, Iterative Algorithm, and Integer linear program
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Pan-European WDM optical transport networks (OTN), as the supporting infrastructure for the push toward an “information society” will require new levels of management and supervision to ensure the quality of payload delivery. Several... more
Pan-European WDM optical transport networks (OTN), as the supporting infrastructure for the push toward an “information society” will require new levels of management and supervision to ensure the quality of payload delivery. Several European funded projects such as MEPHISTO and MOON have addressed the needs for WDM-OTN Management Systems Support, proposing layered management object information models as a standard. This
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Purpose – The purpose of this paper is to illustrate the advantages of using the UCLP software for network operators, advanced and regular end users in the research networking community. Design/methodology/approach – This paper provides... more
Purpose – The purpose of this paper is to illustrate the advantages of using the UCLP software for network operators, advanced and regular end users in the research networking community. Design/methodology/approach – This paper provides an example of the deployment of UCLP in the GÉANT2/National Research and Education Networks (NRENs) scenario, and compares how network operators, advanced users and regular end users would do their work, with and without UCLP. Findings – The paper provides high‐level technical information about UCLP as well as depicting the drivers for its use in the European research networking community. Research limitations/implications – This paper does not explain the details of the deployment of the software in the GÉANT2/National Research and Education Networks (NRENs) scenario, it just explains the benefits that the deployment of the software would provide. If the deployment was to be done today, some improvements to UCLP should be done, as well as support fo...
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Research Interests: Computer Science, Distributed Computing, Routing, Resource Allocation, Packet Switching, and 11 moreRouting protocols, Optical switching, Simulation, Resource Management, Optical Burst Switching, Routing Protocol, Optical telecommunication, Telecommunication network, Electrical And Electronic Engineering, Deflection, and Downlink
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ABSTRACT In this paper, we introduce and evaluate a preventive contention avoidance protocol to reduce the burst loss probability in emerging OBS networks. The proposed solution reacts to highly loaded downstream node situations by... more
ABSTRACT In this paper, we introduce and evaluate a preventive contention avoidance protocol to reduce the burst loss probability in emerging OBS networks. The proposed solution reacts to highly loaded downstream node situations by preventively deflecting the bursts towards less loaded neighbors. To keep pace with OBS traffic dynamics while minimizing the related control overhead, we propose the current node state information to be propagated downstream in the burst control packet. As a result, accurate adjacent nodes state information can be maintained, improving either preventive or reactive deflection routing decisions. Using this information, two different routing heuristics are presented aiming to reduce the computational costs at intermediate nodes. Our proposals are discussed and further assessed by extensive simulation results, showing a significant burst loss reduction especially when the burst size increases.
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Nowadays, end users are becoming more active with more powerful capabilities on the network management topics, where tools such as User Controlled Light Paths (from now on referred as to as UCLP) have appeared in order to give users a... more
Nowadays, end users are becoming more active with more powerful capabilities on the network management topics, where tools such as User Controlled Light Paths (from now on referred as to as UCLP) have appeared in order to give users a higher level of functionalities. It ...