The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Dimitra Simeonidou - One of the best experts on this subject based on the ideXlab platform.
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Hardware-programmable Optical networks
Science China Information Sciences, 2016Co-Authors: Shuangyi Yan, Emilio Hugues-salas, Reza Nejabati, Dimitra SimeonidouAbstract:本文提出了一种基于大阵列光开关和全光监控技术实现的硬件可编程光网络。该光网络能够依据网络的流量特性和规模,动态配置光节点的网络功能和节点规模。硬件可编程光网络大大提高了光网络的灵活性,并能够针对网络需求优化网络硬件配置,从而可以应对未来多维度光网络中多样化的动态需求,提高光网络硬件的利用效率。 For future multi-dimensional Optical networks, vast network resources provided by space division multiplexing and wavelength division multiplexing technologies, require new network architectures to scale up current network functions. The huge switch-granularity range requires a more dynamic way to deploy network resources. In this paper, we proposed a hardware-programmable Optical network which deploys network resources according to incoming traffic requests. The proposed network supports Node function programmability and Node architecture adaptability, which are critical for dynamic function and resources deployments. Architecture-on-Demand based Node architecture adapts Node architectures and also enables network function programmability by incorporating with several flexible Node functions. Other enabling technologies, such as ubiquitous power monitoring and dynamic Optical power management, assures the programmable Optical Node work properly. Based on all these technologies, we established a hardware-programmable Optical network testbed. Several use cases were demonstrated successfully, such as dynamic power equalization and Optical debugging. These work verified the feasibility of hardware-programmable Optical network, which dynamically allocate network resources for service provision. The proposed hardware programmable Optical network will lead to a better hardware utilization and provide a possible solution for the future multi-dimensional Optical network.
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OFC - Function placement and configuration for power balanced network function programmable Optical Nodes
Optical Fiber Communication Conference, 2015Co-Authors: Hui Yuan, Georgios Zervas, Miquel Garrich Alabarce, Emilio Hugues-salas, Dimitra SimeonidouAbstract:Synthesis, placement and configuration of SSS and EDFAs for different power balance scenarios is presented, for the first time, for function programmable Optical Node architectures. Comparison on device's number and OSNR performance are reported.
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Next generation Optical Nodes: The vision of the European research project IDEALIST
IEEE Communications Magazine, 2015Co-Authors: Emilio Hugues-salas, Georgios Zervas, Dimitra Simeonidou, Evangelos Kosmatos, Theofanis Orphanoudakis, Alexandros Stavdas, Marc Bohn, Antonio Napoli, Talha Rahman, Filippo CuginiAbstract:As traffic demands become more uncertain and newer services continuously arise, novel network elements are needed to provide more flexibility, scalability, resilience and adaptability to today's Optical networks. Considering these requirements, within the European project IDEALIST the investigation of elastic Optical networks is undertaken with special focus on next generation Optical Node architectures. As an evolution of existent ROADMs and OXCs, these Optical Nodes will establish a new paradigm in which the network requirements will be efficiently addressed considering various emerging dimensions. In this article, we describe the drivers, architectures, and technologies that will enable these novel Optical Nodes. In addition, multivendor traffic interoperability, Optical defragmentation, and Node cascadability are also described as considerations in the Node design.
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architecture on demand design for high capacity Optical sdm tdm fdm switching
IEEE\ OSA Journal of Optical Communications and Networking, 2015Co-Authors: Miquel Garrich, Georgios Zervas, Dimitra Simeonidou, N. Amaya, Juliano R F Oliveira, Paolo Giaccone, Andrea Bianco, Julio C R F OliveiraAbstract:Reconfigurable Optical add/drop multiplexers (ROADMs) are key elements in operators' backbone networks. The breakthrough Node concept of architecture on demand (AoD) permits us to design Optical Nodes with higher flexibility with respect to ROADMs. In this work, we present a five-step algorithm for designing AoD instances according to some given traffic requests, which are able to support subwavelength time switching up to wavelength/superchannel/fiber switching. We evaluate AoD performancein terms of power consumption and number of backplane Optical cross-connections. Furthermore, we discuss trade-offs involved in the migration from a fixed to a flexible grid with regard to the Optical Node size, capacity, and power consumption. We compare several ROADM architectures proposed in the literature with AoD in terms of power consumption and cost. We also study different technologies for enhancing the scalability of AoD. Results show that AoD can bring significant power savings compared to other architectures while offering a throughput of hundreds of terabits per second.
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introducing Node architecture flexibility for elastic Optical networks
IEEE\ OSA Journal of Optical Communications and Networking, 2013Co-Authors: N. Amaya, Georgios Zervas, Dimitra SimeonidouAbstract:A large number of factors generate uncertainty on traffic demands and requirements. In order to deal with uncertainty Optical Nodes and networks are equipped with flexibility. In this context, we define several types of flexibility and propose a method, based on entropy maximization, to quantitatively evaluate the flexibility provided by Optical Node components, subsystems, and architectures. Using this method we demonstrate the equivalence, in terms of switching flexibility, of finer spectrum granularity, and faster reconfiguration rate. We also show that switching flexibility is closely related to bandwidth granularity. The proposed method is used to derive formulae for the switching flexibility of key Optical Node components and the switching and architectural flexibility of four elastic Optical Node configurations. The elastic Optical Nodes presented provide various degrees of flexibility and functionality that are discussed in the paper, from flexible spectrum switching to adaptive architectures that support elastic switching of frequency, time, and spatial resources plus on-demand spectrum defragmentation. We further complement this analysis by experimentally demonstrating flexible time, spectrum, and space switching plus dynamic architecture reconfiguration. The implemented architectures support continuous and subwavelength heterogeneous signals with bitrates ranging from 190 Mb/s, for a subwavelength channel, to 555 Gb/s for a multicarrier superchannel. Results show good performance and the feasibility of implementing the architecture-on-demand concept.
Georgios Zervas - One of the best experts on this subject based on the ideXlab platform.
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OSNR aware composition of an open and disaggregated Optical Node and network
IEEE\ OSA Journal of Optical Communications and Networking, 2017Co-Authors: Heng Liu, Adaranijo Peters, Miquel Garrich, Georgios ZervasAbstract:A function programmable Optical network has been recently proposed to enhance the flexibility of an Optical transport based on architecture-on-demand (AoD). The flexible synthesis of Optical Node architectures provided by AoD enables an open and disaggregated Optical layer thanks to the available deep programmability. However, previous studies have focused on how to synthesize a single Node out of switching function blocks, thus neglecting the Optical signal-to-noise ratio (OSNR) impact, power imbalance effects due to the diverse set of devices traversed per input–output configuration, and networkwide implications. In this work, we present an Optical network-wide function synthesis (ONetFuS), which is an algorithm to compose AoD Nodes that consider placement and configuration of both switches and amplifiers. ONeFuS minimizes OSNR degradation and deviation across channels and offers enhanced power balance performance. Moreover, ONetFuS addresses multiple-Node scenarios to investigate cascading, transmission distance, and networking effects. We compare the number of Optical cross-connections computed by our proposal against solutions in the literature. Results in network scenarios, including the number of components, power balance, OSNR variations, and OSNR penalty reductions, prove the suitability of our proposed ONetFuS for open and functional programmable Optical networks.
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OFC - Function placement and configuration for power balanced network function programmable Optical Nodes
Optical Fiber Communication Conference, 2015Co-Authors: Hui Yuan, Georgios Zervas, Miquel Garrich Alabarce, Emilio Hugues-salas, Dimitra SimeonidouAbstract:Synthesis, placement and configuration of SSS and EDFAs for different power balance scenarios is presented, for the first time, for function programmable Optical Node architectures. Comparison on device's number and OSNR performance are reported.
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Next generation Optical Nodes: The vision of the European research project IDEALIST
IEEE Communications Magazine, 2015Co-Authors: Emilio Hugues-salas, Georgios Zervas, Dimitra Simeonidou, Evangelos Kosmatos, Theofanis Orphanoudakis, Alexandros Stavdas, Marc Bohn, Antonio Napoli, Talha Rahman, Filippo CuginiAbstract:As traffic demands become more uncertain and newer services continuously arise, novel network elements are needed to provide more flexibility, scalability, resilience and adaptability to today's Optical networks. Considering these requirements, within the European project IDEALIST the investigation of elastic Optical networks is undertaken with special focus on next generation Optical Node architectures. As an evolution of existent ROADMs and OXCs, these Optical Nodes will establish a new paradigm in which the network requirements will be efficiently addressed considering various emerging dimensions. In this article, we describe the drivers, architectures, and technologies that will enable these novel Optical Nodes. In addition, multivendor traffic interoperability, Optical defragmentation, and Node cascadability are also described as considerations in the Node design.
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architecture on demand design for high capacity Optical sdm tdm fdm switching
IEEE\ OSA Journal of Optical Communications and Networking, 2015Co-Authors: Miquel Garrich, Georgios Zervas, Dimitra Simeonidou, N. Amaya, Juliano R F Oliveira, Paolo Giaccone, Andrea Bianco, Julio C R F OliveiraAbstract:Reconfigurable Optical add/drop multiplexers (ROADMs) are key elements in operators' backbone networks. The breakthrough Node concept of architecture on demand (AoD) permits us to design Optical Nodes with higher flexibility with respect to ROADMs. In this work, we present a five-step algorithm for designing AoD instances according to some given traffic requests, which are able to support subwavelength time switching up to wavelength/superchannel/fiber switching. We evaluate AoD performancein terms of power consumption and number of backplane Optical cross-connections. Furthermore, we discuss trade-offs involved in the migration from a fixed to a flexible grid with regard to the Optical Node size, capacity, and power consumption. We compare several ROADM architectures proposed in the literature with AoD in terms of power consumption and cost. We also study different technologies for enhancing the scalability of AoD. Results show that AoD can bring significant power savings compared to other architectures while offering a throughput of hundreds of terabits per second.
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introducing Node architecture flexibility for elastic Optical networks
IEEE\ OSA Journal of Optical Communications and Networking, 2013Co-Authors: N. Amaya, Georgios Zervas, Dimitra SimeonidouAbstract:A large number of factors generate uncertainty on traffic demands and requirements. In order to deal with uncertainty Optical Nodes and networks are equipped with flexibility. In this context, we define several types of flexibility and propose a method, based on entropy maximization, to quantitatively evaluate the flexibility provided by Optical Node components, subsystems, and architectures. Using this method we demonstrate the equivalence, in terms of switching flexibility, of finer spectrum granularity, and faster reconfiguration rate. We also show that switching flexibility is closely related to bandwidth granularity. The proposed method is used to derive formulae for the switching flexibility of key Optical Node components and the switching and architectural flexibility of four elastic Optical Node configurations. The elastic Optical Nodes presented provide various degrees of flexibility and functionality that are discussed in the paper, from flexible spectrum switching to adaptive architectures that support elastic switching of frequency, time, and spatial resources plus on-demand spectrum defragmentation. We further complement this analysis by experimentally demonstrating flexible time, spectrum, and space switching plus dynamic architecture reconfiguration. The implemented architectures support continuous and subwavelength heterogeneous signals with bitrates ranging from 190 Mb/s, for a subwavelength channel, to 555 Gb/s for a multicarrier superchannel. Results show good performance and the feasibility of implementing the architecture-on-demand concept.
A.m.j. Koonen - One of the best experts on this subject based on the ideXlab platform.
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Optical Node with time-space-and-wavelength domain contention resolution, deflection and dropping capability
Optics Express, 2006Co-Authors: J. J. Vegas Olmos, Nan Chi, Georgios Zervas, Dimitra Simeonidou, I. Tafur Monroy, A.m.j. KoonenAbstract:We experimentally demonstrate an Optical Node with time-space-and-wavelength domain contention resolution, deflection and dropping capability. The Node is composed of an Optical buffer based on an Optical crossconnect and a wavelength converter. Although the experimental results are shown at 10 Gbit/s the bitrate can be increased substantially. Bit-error rate measurements are shown, sustaining only 3.5 dB power penalty after 10µs of Optical buffering and agile wavelength conversion over 18nm span.
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Optical Node with time-space-and-wavelength domain contention resolution capability
2006 European Conference on Optical Communications, 2006Co-Authors: J. J. Vegas Olmos, Nan Chi, Georgios Zervas, Dimitra Simeonidou, A. Lopez, I. Tafur Monroy, A.m.j. KoonenAbstract:We experimentally show up to 10 ?s ms of Optical buffering and wavelength conversion over 18nm, sustaining only 3.5dB of power penalty, in an Optical Node at 10 Gbit/s. The Node is hence capable of time-space-and-wavelength domain contention resolution.
Surinder Singh - One of the best experts on this subject based on the ideXlab platform.
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Optical Combinational Circuit for Contention Detection Circuit in All Optical Router
Optik, 2020Co-Authors: Surinder Singh, Dilbag Singh, LovkeshAbstract:Abstract This paper is presented an Optical combinational circuit based on nonlinearities of semiconductor Optical amplifier (SOA) and its associated configuration. The associated circuits used are semiconductor Optical amplifier - Mach Zehnder Interferometer (SOA-MZI) and semiconductor Optical amplifier plus dispersion compensation fiber (SOA + DCF) for packet contention detection. The Optical combinational circuits include the Optical adder connected in 2 × 2 Optical Node for the Optical packet management. All Nodes have capability of decisions and processing of incoming Optical signals at 1.25 Gbps. The system performance has been evaluated and optimized by varying the SOA parameters. The proposed Optical combinational circuit is also suitable for network with 3 × 3 Optical Node. The proposed Optical combinational circuit can be verified at 10 Gbps for the next generation broadband Optical network.
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A hybrid WDM ring–tree topology delivering efficient utilization of bandwidth over resilient infrastructure
Photonic Network Communications, 2018Co-Authors: Sukhbir Singh, Surinder SinghAbstract:This paper proposed a hybrid WDM ring–tree topology which employs spectrally efficient 60 Gbps non-return-to-zero/polarization shift keying Optical orthogonal modulated signals. The reconfigurable Optical add/drop multiplexers, Optical cross-connects and semiconductor Optical amplifiers are utilized to make hybrid ring–tree architecture. Each Optical add/drop multiplexer Node is connected to tree topology to further increase the number of users. The main contribution of the proposed spectrally efficient hybrid Optical network is to support the maximum number of users within limited bandwidth for future communication networks. Also, the proposed resilient ring–tree architecture has advantages such as high Optical Node density and bandwidth/spectral efficiency as compared to conventional packet-switched Optical access network.
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A hybrid WDM ring–tree topology delivering efficient utilization of bandwidth over resilient infrastructure
Photonic Network Communications, 2018Co-Authors: Sukhbir Singh, Surinder SinghAbstract:This paper proposed a hybrid WDM ring–tree topology which employs spectrally efficient 60 Gbps non-return-to-zero/polarization shift keying Optical orthogonal modulated signals. The reconfigurable Optical add/drop multiplexers, Optical cross-connects and semiconductor Optical amplifiers are utilized to make hybrid ring–tree architecture. Each Optical add/drop multiplexer Node is connected to tree topology to further increase the number of users. The main contribution of the proposed spectrally efficient hybrid Optical network is to support the maximum number of users within limited bandwidth for future communication networks. Also, the proposed resilient ring–tree architecture has advantages such as high Optical Node density and bandwidth/spectral efficiency as compared to conventional packet-switched Optical access network.
N. Amaya - One of the best experts on this subject based on the ideXlab platform.
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architecture on demand design for high capacity Optical sdm tdm fdm switching
IEEE\ OSA Journal of Optical Communications and Networking, 2015Co-Authors: Miquel Garrich, Georgios Zervas, Dimitra Simeonidou, N. Amaya, Juliano R F Oliveira, Paolo Giaccone, Andrea Bianco, Julio C R F OliveiraAbstract:Reconfigurable Optical add/drop multiplexers (ROADMs) are key elements in operators' backbone networks. The breakthrough Node concept of architecture on demand (AoD) permits us to design Optical Nodes with higher flexibility with respect to ROADMs. In this work, we present a five-step algorithm for designing AoD instances according to some given traffic requests, which are able to support subwavelength time switching up to wavelength/superchannel/fiber switching. We evaluate AoD performancein terms of power consumption and number of backplane Optical cross-connections. Furthermore, we discuss trade-offs involved in the migration from a fixed to a flexible grid with regard to the Optical Node size, capacity, and power consumption. We compare several ROADM architectures proposed in the literature with AoD in terms of power consumption and cost. We also study different technologies for enhancing the scalability of AoD. Results show that AoD can bring significant power savings compared to other architectures while offering a throughput of hundreds of terabits per second.
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introducing Node architecture flexibility for elastic Optical networks
IEEE\ OSA Journal of Optical Communications and Networking, 2013Co-Authors: N. Amaya, Georgios Zervas, Dimitra SimeonidouAbstract:A large number of factors generate uncertainty on traffic demands and requirements. In order to deal with uncertainty Optical Nodes and networks are equipped with flexibility. In this context, we define several types of flexibility and propose a method, based on entropy maximization, to quantitatively evaluate the flexibility provided by Optical Node components, subsystems, and architectures. Using this method we demonstrate the equivalence, in terms of switching flexibility, of finer spectrum granularity, and faster reconfiguration rate. We also show that switching flexibility is closely related to bandwidth granularity. The proposed method is used to derive formulae for the switching flexibility of key Optical Node components and the switching and architectural flexibility of four elastic Optical Node configurations. The elastic Optical Nodes presented provide various degrees of flexibility and functionality that are discussed in the paper, from flexible spectrum switching to adaptive architectures that support elastic switching of frequency, time, and spatial resources plus on-demand spectrum defragmentation. We further complement this analysis by experimentally demonstrating flexible time, spectrum, and space switching plus dynamic architecture reconfiguration. The implemented architectures support continuous and subwavelength heterogeneous signals with bitrates ranging from 190 Mb/s, for a subwavelength channel, to 555 Gb/s for a multicarrier superchannel. Results show good performance and the feasibility of implementing the architecture-on-demand concept.
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Field Trial Demonstration of Spectrum Defragmentation and Grooming in Elastic Optical Node
Journal of Lightwave Technology, 2013Co-Authors: M. Irfan Anis, Georgios Zervas, N. Amaya, Sergio Pinna, Mirco Scaffardi, Francesco Fresi, Antonella Bogoni, Reza Nejabati, Dimitra SimeonidouAbstract:A novel Optical Node architecture based on all-Optical traffic grooming for flexible Optical networks is proposed as a mean to utilize the Optical spectrum flexibly. In this work, we have overcome the key technical challenge towards implementation of the Node architecture by designing and experimentally evaluating a fully flexible intelligent Optical Node. The proposed solution has the potential to deal with simultaneous multi-functional degree of switching such as format conversion, wavelength conversion, multicasting, spectrum defragmentation and time-domain grooming capability in order to maintain efficient resource utilization. The field experiment was also performed on original and converted channels over a 110-km dark fiber link with the aim of proving the signal robustness in a real network scenario. Finally, BER measurements experimentally demonstrate efficient adaptive switching and processing of variable fragmented traffic, leading to improved network scalability and efficiency.
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All-Optical traffic grooming in elastic Optical network
2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC NFOEC), 2013Co-Authors: Irfan M. Anis, N. Amaya, Sergio Pinna, Mirco Scaffardi, Francesco Fresi, Antonella Bogoni, Reza Nejabati, G. Zervas, D. SimeonidouAbstract:Novel architecture based on all-Optical traffic grooming in Optical Node for elastic Optical network is proposed. BER measurements experimentally demonstrate efficient adaptive switching and processing of variable fragmented traffic, leading to improved network scalability and efficiency.
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Optical Node architectures for elastic networks: From static to architecture on demand
2012 14th International Conference on Transparent Optical Networks (ICTON), 2012Co-Authors: N. Amaya, Georgios Zervas, Dimitra SimeonidouAbstract:We present candidate Optical Node architectures for the implementation of elastic networks. The proposed architectures are compared in terms of their performance, flexibility and functionality, which ranges from flexible spectrum switching to the provisioning of adaptive architectures with support of elastic multi-dimensional switching. Results show that high Node flexibility is advantageous for implementing elastic Optical networks that require efficient transport and on-demand functionality such as spectrum defragmentation.