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Träfflista för sökning "WFRF:(Karlsson Magnus 1967 ) "

Sökning: WFRF:(Karlsson Magnus 1967 )

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1.
  • Ahmad, Tauseef, 1986-, et al. (författare)
  • Methodology for Power-Aware Coherent Receiver Design
  • 2013
  • Ingår i: Advanced Photonics Congress (SPPCom) 2013.
  • Konferensbidrag (refereegranskat)abstract
    • We describe a methodology to design and evaluate DSP hardware for a coherent receiver. Important parameters that can be assessed include DSP power consumption and chip area.
2.
  • Björk, Magnus, 1977-, et al. (författare)
  • Exposed Datapath for Efficient Computing
  • 2006
  • Rapport (övrigt vetenskapligt)abstract
    • We introduce FlexCore, which is the first exemplar of a processor based on the FlexSoC processor paradigm. The FlexCore utilizes an exposed datapath for increased performance. Microbenchmarks yield a performance boost of a factor of two over a traditional five-stage pipeline with the same functional units as the FlexCore. We describe our approach to compiling for the FlexCore. A flexible interconnect allows the FlexCore datapath to be dynamically reconfigured as a consequence of code generation. Additionally, specialized functional units may be introduced and utilized within the same architecture and compilation framework. The exposed datapath requires a wide control word. The conducted evaluation of two micro benchmarks confirms that this increases the instruction bandwidth and memory footprint. This calls for an efficient instruction decoding as proposed in the FlexSoC paradigm.
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4.
  • Ebenhag, S. C., et al. (författare)
  • Coherent optical two-way frequency transfer in a commercial DWDM network
  • 2016
  • Ingår i: 47th Annual Precise Time and Time Interval Systems and Applications Meeting, PTTI 2016; Hyatt Regency MontereyMonterey; United States; 25 January 2016 through 28 January 2016. - 2333-2085. ; s. 116-120
  • Konferensbidrag (refereegranskat)abstract
    • An experimental fiber connection for ultra-stable optical frequency transfer is established between SP Technical Research Institute of Sweden in Borås and Chalmers University of Technology in Gothenburg. The distance is approximately 60 km, and the connection is implemented in the Swedish University Computer Network. The sites are connected through an active flexible communication network where each optical channel can be configured with terminal equipment based on the user needs. The network is implemented with unidirectional optical amplifiers and duplex fibers. The signal quality and the stability when sending an optical coherent frequency utilizing a wavelength in a DWDM system fiber pair, is evaluated within this work. The aim of the system is to be ultra-stable which corresponds to a stability of 10-13 for t = 1 s (Overlapping Allan Variance), as well as providing the ability to distribute monitored ultra-stable frequency with a future traceability to UTC (SP) to multiple users within the future network. This paper describes the current status and results from the frequency transfer between SP and Chalmers.
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5.
  • Ebenhag, S. C., et al. (författare)
  • Implementation of an optical fiber frequency distribution via commercial DWDM
  • 2016
  • Ingår i: 2016 IEEE International Frequency Control Symposium, IFCS 2016 - Proceedings. - 9781509020911
  • Konferensbidrag (refereegranskat)abstract
    • The rapid development in communication infrastructure over the past decades entails an increasing dependence on time and frequency, as well as its redundant distribution. This places demands not only on already existing distribution methods, but also on the development of new ones to meet future needs. To meet these demands several research groups are working on high performance fiber-based frequency transfer techniques. The best achieved performance so far is the techniques using a single bi-directional fiber connection, with customized bi-directional optical amplifiers [1]. The objective of this project is to develop a method that is compatible with data communication in DWDM-systems, i.e. using the existing infrastructure, as well as to be complementary technique for time and frequency distribution. Even though it is likely to have worse performance than the bi-directional system in terms of frequency stability, it will allow for the impassable obligation to follow the deployed structure of telecom networks. The establishment and early results of the non-stabilized link has been previously presented [2, 3]. The ongoing evaluation and improvement will be aimed at finding relevant performance specifications for a connection using this technique. The work presented here is the most recent results of the frequency transfer and discusses the future plans for the fiber connection, including the added time transfer method. If proven successful, the long-term objective is to establish a distribution network for optical frequency references in Sweden. © 2016 IEEE.
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6.
  • Ebenhag, S.C., et al. (författare)
  • Two-way coherent frequency transfer in a commercial DWDM communication network in Sweden
  • 2015
  • Ingår i: 2015 Joint Conference of the IEEE International Frequency Control Symposium and the European Frequency and Time Forum, FCS 2015 - Proceedings. - 1075-6787. - 978-147998866-2 ; s. 276-279
  • Konferensbidrag (refereegranskat)abstract
    • An experimental fiber link is being established between SP Technical Research Institute of Sweden in Boras and Chalmers University of Gothenburg in Sweden. The one way fiber length is about 60 km and implemented in SUNET (Swedish University Network). The aim of the project is to evaluate the signal quality when sending a stable optical frequency utilizing a wavelength in a DWDM (Dense Wavelength Division Multiplexing) system fiber pair. The experiment uses a channel in the DWDM with the wavelength of 1542.14 nm. This wavelength is within the C band and is therefore compatible with common Erbium doped amplifiers in this network. Another aim of the system is to be ultra-stable which corresponds to a stability of 1×10-13 for τ = 1 s as well as providing the ability to distribute monitored ultra-stable frequency with a future traceability to UTC (SP) (National realization of Universal Time Coordinated within Sweden) to multiple users within the network. Measurements of an optical frequency transfer using a fiber-link based on unidirectional light signals in parallel fibers have shown promising results in a free-running setup and in a lab environment. The fractional frequency stability, analyzed as the Overlapping Allan deviation, is approximately 3×10-13 at τ = 10 s and almost 1×10-14 at 105 s.
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  • Fougstedt, Christoffer, 1990-, et al. (författare)
  • Time-Domain Digital Back Propagation: Algorithm and Finite-Precision Implementation Aspects
  • 2017
  • Ingår i: Optical Fiber Communications Conference and Exhibition. - 978-194358023-1
  • Konferensbidrag (refereegranskat)abstract
    • We propose a nonlinear mitigation algorithm designed from an ASIC perspective, and analyze implementation aspects. Given 9 signal and 11 coefficient bits, reach is increased by 105% compared to linear compensation in single-channel 16-QAM transmission.
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