The Experts below are selected from a list of 4764 Experts worldwide ranked by ideXlab platform
Keren Bergman - One of the best experts on this subject based on the ideXlab platform.
-
Optimization of a Switching Node for Optical
2020Co-Authors: Odile Liboiron-ladouceur, Keren BergmanAbstract:In this letter, we demonstrate a 2 2 Switching Node optimized for optical multistage interconnection networks. The op- tical packet-switched Node is improved by making use of compara- tors with dual-threshold action to regenerate the routing header signal. The Switching Node is shown to correctly route packets with the presence of glitches in the header information. We employ a hybrid integrated semiconductor optical amplifier in the Switching Node that reduces packet guard times enabling a 67% increase in the number of stages for large-scale multistage networks.
-
Broadband silicon photonic packet-Switching Node for large-scale computing systems
IEEE Photonics Technology Letters, 2012Co-Authors: Wenjia Zhang, Hugo L. R. Lira, Michal Lipson, Lin Xu, Qi Li, Keren BergmanAbstract:We present a broadband packet-Switching Node that utilizes silicon photonic technology. The Node design uses a silicon microring for Switching functionality, leverages in-flight header processing for arbitration, and has a tunable driving circuit for thermal-effect mitigation. Moreover, these integrated microring switches are capable of scaling to tremendously high port counts in a compact area, which are attractive for data-center networks. We experimentally characterize the extinction ratio of the switch for varying packet durations, interarrival times, and driving voltages and demonstrate an error-free routing of 10-Gb/s wavelength-striped packets with lengths of up to 1536 ns. We further study the resonance thermal drifting for long-hold-time packet Switching through carrier injection and show thermal-effect mitigation using a pre-emphasized gating signal.
-
Optimization of a Switching Node for Optical Multistage Interconnection Networks
IEEE Photonics Technology Letters, 2007Co-Authors: Odile Liboiron-ladouceur, Keren BergmanAbstract:In this letter, we demonstrate a 2 times 2 Switching Node optimized for optical multistage interconnection networks. The optical packet-switched Node is improved by making use of comparators with dual-threshold action to regenerate the routing header signal. The Switching Node is shown to correctly route packets with the presence of glitches in the header information. We employ a hybrid integrated semiconductor optical amplifier in the Switching Node that reduces packet guard times enabling a 67% increase in the number of stages for large-scale multistage networks.
-
An Enhanced Buffered Switching Node for a Data Vortex Interconnection Network
LEOS 2006 - 19th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2006Co-Authors: Assaf Shacham, Keren BergmanAbstract:The design of a buffered photonic Switching Node for a data vortex network is presented. Superior network performance is shown through simulations, and implementation is experimentally demonstrated
-
An FDL-Based Photonic Switching Node for a Data Vortex Optical Packet Switched Interconnection Network
2006 European Conference on Optical Communications, 2006Co-Authors: Assaf Shacham, Keren BergmanAbstract:Adding buffering capacity to the Switching Nodes in the data vortex topology is considered. Experimental feasibility is demonstrated on a prototype SOA-based Switching Node and the performance is studied using computer simulations.
P. Zwierzykowski - One of the best experts on this subject based on the ideXlab platform.
-
Modelling of virtual‐circuit Switching Nodes with multicast connections
European Transactions on Telecommunications, 2009Co-Authors: M. Glabowski, M. Stasiak, P. ZwierzykowskiAbstract:This paper presents an approximate calculation methodology of the occupancy distribution and the blocking probability in a virtual circuit Switching Node with multi-rate unicast and multicast traffic streams. Particular traffic streams are generated by an infinite as well as by a finite population of traffic sources. The model enables calculations of any structure of the groups forming the outgoing directions of the Node. Additionally, bandwidth reservation algorithms are also proposed in order to improve traffic characteristics of different traffic classes. The results of the analytical calculations have been compared with the simulation results of a Switching Node carrying multicast and unicast traffic streams. Copyright © 2007 John Wiley & Sons, Ltd.
-
AICT/ICIW - Blocking Probability Calculation in Virtual Circuit Switching Node with Finite Source Population and Multicast Connections
Advanced Int'l Conference on Telecommunications and Int'l Conference on Internet and Web Applications and Services (AICT-ICIW'06), 2006Co-Authors: M. Gabowski, M. Stasiak, P. ZwierzykowskiAbstract:This paper presents a new approximate recurrent calculation method of the blocking probability in a Switching Node of virtual circuit networks which is offered a mixture of different traffic streams, including multicast traffic streams, generated by a finite population of two-state sources. The method is based on transforming a multi-dimensional service process in the system into a one-dimensional Markov chain. The basis of the proposed calculation algorithm is an assumption about equality of reverse transition rates in both infinite and finite population models. Such an assumption allows us to determine the number of idle sources of particular traffic classes, which consequently leads to determination of offered traffic load in particular states of the group occupancy. Analytical results of the blocking probabilities in exemplary Switching Nodes are compared with simulation results.
-
Blocking Probability Calculation in Virtual Circuit Switching Node with Finite Source Population and Multicast Connections
Advanced Int'l Conference on Telecommunications and Int'l Conference on Internet and Web Applications and Services (AICT-ICIW'06), 2006Co-Authors: M. Gabowski, M. Stasiak, P. ZwierzykowskiAbstract:This paper presents a new approximate recurrent calculation method of the blocking probability in a Switching Node of virtual circuit networks which is offered a mixture of different traffic streams, including multicast traffic streams, generated by a finite population of two-state sources. The method is based on transforming a multi-dimensional service process in the system into a one-dimensional Markov chain. The basis of the proposed calculation algorithm is an assumption about equality of reverse transition rates in both infinite and finite population models. Such an assumption allows us to determine the number of idle sources of particular traffic classes, which consequently leads to determination of offered traffic load in particular states of the group occupancy. Analytical results of the blocking probabilities in exemplary Switching Nodes are compared with simulation results.
-
Multicast connections in a virtual circuit Switching Node
Advanced Industrial Conference on Telecommunications Service Assurance with Partial and Intermittent Resources Conference E-Learning on Telecommunicat, 2005Co-Authors: M. Glabowski, M. Stasiak, P. ZwierzykowskiAbstract:In this paper a new analytical model of a Switching Node carrying a mixture of different traffic streams, including multicast streams, has been proposed. It is assumed that each of the outgoing directions of the Node could be modelled by a limited-availability group composed of links of various capacities. Hence, the model enables calculations of blocking probabilities for calls of all traffic classes for any structure of the groups forming the outgoing directions. The problem of blocking probability evaluation in the Switching Node with multicast connections is solved in the paper by the fixed point methodology. The proposed method is based on an approximation of the service process occurring in outgoing directions by an appropriately constructed one-dimensional Markov chain. The results of analytical calculations have been compared with the simulation results of a Switching Node with three outgoing directions carrying multicast and unicast traffic streams.
-
AICT/SAPIR/ELETE - Multicast connections in a virtual circuit Switching Node
Advanced Industrial Conference on Telecommunications Service Assurance with Partial and Intermittent Resources Conference E-Learning on Telecommunicat, 2005Co-Authors: M. Glabowski, M. Stasiak, P. ZwierzykowskiAbstract:In this paper a new analytical model of a Switching Node carrying a mixture of different traffic streams, including multicast streams, has been proposed. It is assumed that each of the outgoing directions of the Node could be modelled by a limited-availability group composed of links of various capacities. Hence, the model enables calculations of blocking probabilities for calls of all traffic classes for any structure of the groups forming the outgoing directions. The problem of blocking probability evaluation in the Switching Node with multicast connections is solved in the paper by the fixed point methodology. The proposed method is based on an approximation of the service process occurring in outgoing directions by an appropriately constructed one-dimensional Markov chain. The results of analytical calculations have been compared with the simulation results of a Switching Node with three outgoing directions carrying multicast and unicast traffic streams.
Assaf Shacham - One of the best experts on this subject based on the ideXlab platform.
-
An FDL-Based Photonic Switching Node for a Data Vortex Optical Packet Switched Interconnection Network
2006 European Conference on Optical Communications, 2006Co-Authors: Assaf Shacham, Keren BergmanAbstract:Adding buffering capacity to the Switching Nodes in the data vortex topology is considered. Experimental feasibility is demonstrated on a prototype SOA-based Switching Node and the performance is studied using computer simulations.
-
An Enhanced Buffered Switching Node for a Data Vortex Interconnection Network
LEOS 2006 - 19th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2006Co-Authors: Assaf Shacham, Keren BergmanAbstract:The design of a buffered photonic Switching Node for a data vortex network is presented. Superior network performance is shown through simulations, and implementation is experimentally demonstrated
-
a wide band nonblocking 2 spl times 2 Switching Node for a spinet network
IEEE Photonics Technology Letters, 2005Co-Authors: Assaf Shacham, Keren BergmanAbstract:We present SPINet (Scalable Photonic Integrated Network), a novel optical packet Switching architecture that is chiefly designed for implementation with photonic integrated circuit technology, where fiber delay lines cannot be employed. A novel physical layer acknowledgment protocol is introduced to mitigate the penalty associated with message dropping. The architecture's concepts are described and the fabrication of a prototype semiconductor optical amplifier-based Switching Node is reported. Routing of 160-Gb/s (16/spl times/10 Gb/s) optically addressed messages with bit-error rates better than 10/sup -12/ and the successful back-propagating transmission of acknowledgment pulses are experimentally demonstrated.
-
Ultra-low latency optical packet Switching Node
IEEE Photonics Technology Letters, 2005Co-Authors: Benjamin A. Small, Assaf Shacham, Keren BergmanAbstract:A photonic packet Switching Node is introduced, and its routing latency is shown to be 15.3 ns. The power penalty of the Node at a bit-error rate (BER) of 10-9 is confirmed to be approximately 0.2 dB across 33 nm of the C-band for 10-Gb/s payload wavelengths. Moreover, multiple-wavelength packets containing 16 payload wavelengths can be switched while maintaining BERs of 10-12 or better.
Mourad Zghal - One of the best experts on this subject based on the ideXlab platform.
-
All-optical multi-wavelength virtual memory based Switching Node
2013 High Capacity Optical Networks and Emerging Enabling Technologies, 2013Co-Authors: Selma Batti, Noureddine Boudriga, Mourad ZghalAbstract:The all-optical Switching Node implementations are limited by the lack of optical memory. We present an optical Switching Node based on all-optical buffering. We propose the organization of the all-optical Switching Node in four blocks: input block, control block, buffering block and Switching block. The virtual memory based on the two loops architecture implements the multi-wavelength concepts to realize a shared buffer with important storage capacity. The memory implementation is demonstrated using optical components. The control parts are designed to resolve the contention problem at the Switching block. A set of simulations is done to prove that the proposed shared memory is able to confine several signals for a relatively long time as a memory and signals can leave the architecture for a relatively short delay after the departure decision is taken. The low penalty observed shows that the system reliability is good.
-
a new all optical Switching Node including virtual memory and synchronizer
Journal of Networks, 2010Co-Authors: Selma Batti, Mourad Zghal, Noureddine BoudrigaAbstract:This paper presents an architecture for an all optical Switching Node. The architecture is suitable for optical packet and optical burst Switching and provides appropriate contention resolution schemes and QoS guarantees. A concept, called virtual memory, is developed to allow controllable and reasonable periods for delaying optical traffics. Related to its implementation, several engineering issues are discussed, including the use of loopbased optical delay lines, fiber Bragg gratings, and limited number of signal amplifications. In particular, two implementations using optical flip-flop and laser neuron network based control units are analyzed. This paper also discusses the implementation and performance of an alloptical synchronizer that is able to synchronize arriving data units to be aligned on the clock signal associated with the beginning time of slots, in the Node, with an acceptable error.
-
An all-optical synchronizer for Switching Node using single-sideband modulator and fiber Bragg gratings
2009 IEEE Symposium on Computers and Communications, 2009Co-Authors: Selma Battia, Mourad Zghal, Noureddine Boudrigaa, Trevor HallbAbstract:The performances of the optical Switching Node are improved in synchronous network. To align Switching Node input flow on a clock signal we propose an all-optical synchronizer using optical components such as fiber Bragg gratings, circulators and single-sideband modulator. This architecture captures the latecomer signal in a loop and delivers it at the start of the next clock period. The system performances were evaluated and the effects of the attenuation and signal to noise ratio on the signal were demonstrated. We show that for 40 Gbit/s bit rate, signals can be synchronized with an error smaller than 5% of the signal duration without reaching unacceptable signal distortions.
-
ISCC - An all-optical synchronizer for Switching Node using single-sideband modulator and fiber Bragg gratings
2009 IEEE Symposium on Computers and Communications, 2009Co-Authors: Selma Battia, Mourad Zghal, Noureddine Boudrigaa, Trevor HallbAbstract:The performances of the optical Switching Node are improved in synchronous network. To align Switching Node input flow on a clock signal we propose an alloptical synchronizer using optical components such as fiber Bragg gratings, circulators and single-sideband modulator. This architecture captures the latecomer signal in a loop and delivers it at the start of the next clock period. The system performances were evaluated and the effects of the attenuation and signal to noise ratio on the signal were demonstrated. We show that for 40Gbit/s bit rate, signals can be synchronized with an error smaller than 5% of the signal duration without reaching unacceptable signal distortions.
K. Bergman - One of the best experts on this subject based on the ideXlab platform.
-
A wide-band nonblocking 2/spl times/2 Switching Node for a SPINet network
IEEE Photonics Technology Letters, 2005Co-Authors: A. Shacham, K. BergmanAbstract:We present SPINet (Scalable Photonic Integrated Network), a novel optical packet Switching architecture that is chiefly designed for implementation with photonic integrated circuit technology, where fiber delay lines cannot be employed. A novel physical layer acknowledgment protocol is introduced to mitigate the penalty associated with message dropping. The architecture's concepts are described and the fabrication of a prototype semiconductor optical amplifier-based Switching Node is reported. Routing of 160-Gb/s (16/spl times/10 Gb/s) optically addressed messages with bit-error rates better than 10/sup -12/ and the successful back-propagating transmission of acknowledgment pulses are experimentally demonstrated.
