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  • 201.
    Hanson, Maj
    et al.
    Chalmers University of Technology, Sweden.
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Interaction effects in the dynamic response of magnetic liquids1991Ingår i: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 101, s. 45-46Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The magnetic susceptibility of magnetic liquids has been measured for frequencies up to 70 MHz. The imaginary part of the susceptibility exhibits a maximum around 10 MHz. This feature is interpreted as due to single-particle Néel relaxation, where particle interactions cause a slight concentration dependence in the position of the maximum.

  • 202. Hanson, Maj
    et al.
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Marup, S
    Comment on "Macroscopic resonant tunneling of magnetization in ferretin"1998Ingår i: Phys. Rev. Lett., Vol. 81, nr 3, s. 735-Artikel i tidskrift (Refereegranskat)
  • 203.
    Hanson, Maj
    et al.
    Chalmers University of Technology, Sweden.
    Johansson, Christer
    RISE., Swedish ICT, Acreo. Chalmers University of Technology, Sweden.
    Mörup, Steen
    Chalmers University of Technology, Sweden.
    The influence of magnetic anisotropy on the magnetization of small ferromagnetic particles1993Ingår i: Journal of Physics: Condensed Matter, ISSN 09538984, Vol. 5, s. 725-732Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The authors calculated the magnetization of small ferromagnetic particles with uniaxial anisotropy. The numerical data were compared with experimental results for a magnetic liquid consisting of small amorphous Fe 0.75C0.25 particles in decalin. From the comparison an anisotropy K approximately=3*105 J m-3 was estimated.

  • 204.
    Hanson, Maj
    et al.
    Chalmers University of Technology, Sweden.
    Johansson, Christer
    RISE., Swedish ICT, Acreo. Chalmers University of Technology, Sweden.
    Mörup, Steen
    Chalmers University of Technology, Sweden.
    Zero-field cooled magnetization of amorphous Fe1-xCx particles - field dependence of the maximum1995Ingår i: Journal of Physics: Condensed Matter, Vol. 7, s. 9263-9268Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We measured the zero-field cooled magnetization, MZPC of a frozen magnetic liquid with amorphous Fe1-xCx particles. MZFC has a maximum at Tp approximately=20 K, which is interpreted as due to blocking of superparamagnetic relaxation in single particles. The maximum shifts towards higher temperatures with increasing measuring field. The shift is explained by the nonlinear field dependence of the magnetization of particles with a size distribution. At temperatures below Tp the magnetic particles have a coercivity and remanence in good agreement with those expected for an ensemble of non-interacting uniaxial particles with a random distribution of easy axes.

  • 205.
    Hanson, Maj
    et al.
    Chalmers University of Technology, Sweden.
    Johansson, Christer
    RISE., Swedish ICT, Acreo. Chalmers University of Technology, Sweden.
    Nilsson, B
    Isberg, P
    Wäppling, R
    Magnetic properties of two-dimensionell arrays of epitaxial Fe (001) submicron particles1999Ingår i: J. of Appl. Phys., Vol. 85, nr 5, s. 2799-Artikel i tidskrift (Refereegranskat)
  • 206.
    Hanson, Maj
    et al.
    Chalmers University of Technology, Sweden.
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Nilsson, Bengt A.
    Chalmers University of Technology, Sweden.
    Svedberg, Erik Björn
    Seagate Research, USA.
    Magnetic properties of epitaxial Ni (001) films sub-micron particles2001Ingår i: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 236, s. 139-50Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The magnetic properties of Ni particles with well-defined geometry, prepared by electron lithography from epitaxial Ni (001) films of thickness 50 and 60nm were studied. The particles were circles with diameters 0.6μm and rectangles with sides 0.9μm and 0.3μm, that were positioned in square and rectangular lattices, having lattice constants about twice the particle dimensions. Reference samples and particles with the lattices oriented along the [1 0 0] and [1 1 0] directions were prepared. Hysteresis curves were obtained for particles and reference samples, in the field range ±2T at temperatures between 50 and 300K. The particles were further imaged by magnetic force microscopy. The coercivities of the particles are about the same as that of the reference samples, being of the order of 10mT at room temperature and increasing with decreasing temperature. This may be explained by the temperature dependence of the magnetic anisotropy of the Ni film, estimated to K1=-12.5, -12.8 and -87.6kJm-3 at 295, 250 and 50K, respectively. Whereas the hysteresis curves of the particles are governed by the intrinsic properties of the starting film in low fields, the decreased lateral size influences the behaviour in higher fields as demagnetization effects and features characteristic for annihilation and nucleation of domain walls. One of the samples, rectangles with the long axis along the [1 1 0] direction, has a significantly higher remanence and coercivity than the others. The magnetic images show that the demagnetized state of this sample comprises both single-domain and multidomain particles. Corresponding images showed only multidomain particles in all other samples. Thus it was concluded that the actual size (0.9μm×0.3μm×50nm) is close to the critical size for single domains in Ni.

  • 207.
    Hanson, Maj
    et al.
    Chalmers University of Technology, Sweden.
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Pedersen, Michael S.
    Chalmers University of Technology, Sweden.
    Mörup, Steen
    Chalmers University of Technology, Sweden.
    The influence of particle size interactions on the magnetization susceptibility of nanometre-size particles1995Ingår i: Journal of Physics: Condensed Matter, ISSN 09538984, Vol. 7, s. 9269-9277Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We studied the magnetic properties of frozen magnetic liquids containing amorphous Fe1-xCx particles. By varying the particle size and concentration, we could separate single particle effects from interactions. In samples containing particles with median diameters 5.0 nm and 3.8 nm and with spontaneous saturation magnetizations 7.1 kA m-1 and 9.2 kA m -1, effects of particle interactions are observed. For 3.2 nm no interactions were observed. In samples with negligible interactions the superparamagnetic blocking temperature increases with the particle size. The effective anisotropy constant increases with decreasing particle size, implying that the anisotropy is enhanced by surface effects.

  • 208. Hansryd, J
    et al.
    Andrekson, P A
    Westlund, M
    Li, J
    RISE., Swedish ICT, Acreo.
    Hedekvist, P O
    Fiber-based optical parametric amplifiers their applications2002Ingår i: IEEE Journal of Selected Topics in Quantum Electronics, Vol. 8Artikel i tidskrift (Refereegranskat)
  • 209. Haunstein, H
    et al.
    Schupke, DA
    Duhovnikov, S
    Lehmann, G
    Stavdas, A
    Gunkel, M
    Martensson, J
    RISE., Swedish ICT, Acreo.
    Lord, A
    Integrated design operation of a transparent optical network: a systematic approach to include physical layer awareness cost function2007Ingår i: IEEE Communications Magazine, Vol. 45, s. 40-47Artikel i tidskrift (Refereegranskat)
  • 210. He, S
    et al.
    Popov, M
    RISE., Swedish ICT, Acreo.
    Qiu, M
    Liao, Z
    Simovski, C
    Explicit formulas for obtaining the radiation characteristics of an antenna based on a three-dimensional metallic photonic bandgap structure2001Ingår i: Microwave Optical Technology Letter, Vol. 29, nr 6, s. 376-Artikel i tidskrift (Refereegranskat)
  • 211. He, S
    et al.
    Popov, M
    RISE., Swedish ICT, Acreo.
    Qiu, M
    Simovski, C
    An explicit method for the analysis of guided waves in a line defect channel in a photonic crystal2000Ingår i: Microwave Optical Technology Letters, Vol. 25, nr 4, s. 236-Artikel i tidskrift (Refereegranskat)
  • 212. He, S
    et al.
    Popov, M
    RISE., Swedish ICT, Acreo.
    Qiu, M
    Simovski, C
    The influence of the dielectric-air interface on the radiation pattern of an antenna in a metallic photonics bandgap structure in a dielectric host medium2000Ingår i: Microwave Optical Technology Letters, Vol. 26, nr 6, s. 367-Artikel i tidskrift (Refereegranskat)
  • 213. He, S
    et al.
    Simovski, C
    Popov, M
    RISE., Swedish ICT, Acreo.
    An explicit efficient method for obtaining the radiation characteristics of wire antennas in metallic photonic bandgap structures2000Ingår i: Microwave Optical Technology Letters, Vol. 26, nr 2, s. 67-Artikel i tidskrift (Refereegranskat)
  • 214.
    Helander, P
    RISE., Swedish ICT, Acreo.
    Measurement of fictive temperature of silica glass optical fibers2004Ingår i: Journal of Materials Science, Vol. 39, nr 11, s. 3799-800Artikel i tidskrift (Refereegranskat)
  • 215.
    Helander, P
    RISE., Swedish ICT, Acreo.
    Practical aspects on measuring refractive index profiles of non-circular fiberoptic preforms2005Ingår i: Measurement Science Technology, Vol. 16, s. 628-32Artikel i tidskrift (Refereegranskat)
  • 216. Hellsing, Maja
    et al.
    Fokine, M
    Claesson, A
    RISE., Swedish ICT, Acreo.
    Nilsson, L-E
    Margulis, W
    RISE., Swedish ICT, Acreo.
    Time-of-flight secondary ion mass spectrometry imaging of dopant diffusion in optical fiber2003Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 203-204, s. 3458-61Artikel i tidskrift (Refereegranskat)
  • 217. Hellström, S
    et al.
    Chen, Z-H
     Fu, Y
    Qiu, M
    Soltanmoradi, R
    Wang, Q
    RISE., Swedish ICT, Acreo.
    Andersson, J Y
    RISE., Swedish ICT, Viktoria.
    Increased photocurrent in quantum dot infrared photodetector by subwavelength hole array in metal thin film2010Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 96, s. 231110-Artikel i tidskrift (Refereegranskat)
  • 218. Hendriksen, PV
    et al.
    Oxborrow, CA
    Linderoth, S
    Marup, S
    Hanson, M
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Badker, F
    Davies, K
    Swells, SW
    Particle interaction effects in systems of ultrafine iron oxide particles1993Ingår i: Nucl. Instrum. Meth. Phys. Res., Vol. 876, s. 138-Artikel i tidskrift (Refereegranskat)
  • 219. Herlogsson, L
    et al.
    Crispin, X
    Robinson, N D
    Sandberg, Mats
    RISE., Swedish ICT, Acreo.
    Hagel, O
    Gustafsson, G
    RISE., Swedish ICT, Acreo.
    Berggren, M
    Low-Voltage Polymer Field-Effect Transistors Gated Via a Proton Conductor2007Ingår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 19, nr 1, s. 97-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Low operating voltages for p-channel organic field-effect transistors (OFETs) can be achieved by using an electrolyte as the gate insulator. However, mobile anions in the electrolyte can lead to undesired electrochemistry in the channel. In order to avoid this, a polyanionic electrolyte is used as the gate insulator. The resulting OFET has operating voltages of less than 1€‰V (see figure) shows fast switching (less than 0.3€‰ms) in ambient atmosphere._x000D_

  • 220. Hey, R 
    et al.
    Noharet, B 
    RISE., Swedish ICT, Acreo.
    Sjöberg, H 
    Internet remote-controlled optical correlator based on 256x256 FLC spatial light modulators1999Ingår i: J. Opt. A: Pure Appl. Opt., Vol. 1, s. 307-Artikel i tidskrift (Refereegranskat)
  • 221. Hllstig, E
    et al.
    Åhgren, J
    Allard, L
    Sjöqvist, L
    Engström, D
    Hård, S
    Agren, D
    Junique, S
    Wang, Q
    RISE., Swedish ICT, Acreo.
    Noharet, B
    Retrocommunication utilizing electroabsorption modulators non-mechanical beam steering2005Ingår i: Optical Engineering, Vol. 44, nr 4Artikel i tidskrift (Refereegranskat)
  • 222. Hofmann, U G
    et al.
    Bär, M
    Detemple, P
    Kindlundh, M
    RISE., Swedish ICT, Acreo.
    Norlin, P
    RISE., Swedish ICT, Acreo.
    Acute multisite recording probes for neurons in mice men2004Ingår i: MST News, Vol. 4, nr 1, s. 14-Artikel i tidskrift (Refereegranskat)
  • 223.
    Holm, J
    RISE., Swedish ICT, Acreo.
    A fluorescence detection selection device for DNA-molecules bound to microspheres1999Ingår i: Nucleosides & Nucleotide, Vol. 16, nr 5Artikel i tidskrift (Refereegranskat)
  • 224. Holm, J
    et al.
    Ahlfeldt, H
    Svensson, M
    RISE., Swedish ICT, Acreo.
    Vieider, C
    Through-etched Silicon Carriers for Passive Alignment of Optical Fibers to Surface-Active Optoelectronic Components2000Ingår i: Sensors and Actuators A-Physical, ISSN 0924-4247, E-ISSN 1873-3069, Vol. 82, nr 1, s. 245-Artikel i tidskrift (Refereegranskat)
  • 225. Huyang, G
    et al.
    Canning, J
    Aslund, M-L
    Naqshbandi, M
    Gibson, B
    Petermann, I
    RISE., Swedish ICT, Acreo.
    Stocks, D
    Crossley, M-J
    Porphyrin doped sol-gel lined structured optical fibres for local remote sensing2011Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 36, nr 11, s. 1975-Artikel i tidskrift (Refereegranskat)
  • 226. Huyang, G
    et al.
    Petermann, I
    RISE., Swedish ICT, Acreo.
    Canning, J
    Naqshbandi, M
    Crossley, MJ
    Characterisation functionalisation of cold-processed titania sol-gel layers on silica silicate surfaces2012Ingår i: Optical Materials Express, Vol. 2, nr 2, s. 222-7Artikel i tidskrift (Refereegranskat)
  • 227.
    Hyllander, G.
    et al.
    LKAB, Sweden.
    Ökvist, Lena Sundqvist
    RISE - Research Institutes of Sweden, Material och produktion, Swerea MEFOS AB.
    Malmberg, David
    RISE - Research Institutes of Sweden, Material och produktion, Swerea MEFOS AB.
    Eriksson, Johan
    RISE - Research Institutes of Sweden, Material och produktion, Swerea MEFOS AB.
    Olsson, E.
    SSAB EMEA AB, Sweden.
    Zetterlund, E.
    RISE., Swedish ICT, Acreo.
    Tarasenko, O.
    RISE., Swedish ICT, Acreo.
    Innovative measurement technique for raceway monitoring2012Ingår i: 6th Int. Congress on the Science and Technology of Ironmaking 2012, ICSTI 2012 - Including Proceedings from the 42nd Ironmaking and Raw Materials Seminar, and the 13th Brazilian Symp. on Iron Ore, 2012, Vol. 3, s. 1732-1743Konferensbidrag (Refereegranskat)
    Abstract [en]

    When raceway conditions are changed, e.g blast parameters or selection of injection material, additional measurements and monitoring of raceway can support evaluation of the effects on raceway conditions. Two types of measurement methods have been tested during injection trials with BF flue dust at the SSAB EMEA BF in Oxelösund and the LKAB Experimental Blast Furnace (EBF®). The raceway depth was measured using microwave technique and a camera was installed for viewing the raceway when the peep hole was occupied by the depth measurements equipment. Temperature estimation was made on thermal radiation guided via an optical fibre from the raceway to a spectrometer. Evaluation methods were developed based on Planck radiation law. The measurement techniques and their use for monitoring of raceway conditions are discussed.

  • 228. Höchst, A
    et al.
    Scheuerer, R
    Stahl, H
    Fischer, F
    Metzger, L
    Reichenbach, R
    Lrmer, F
    Kronmuller, S
    Watcham, S
    Rusu, C
    RISE., Swedish ICT, Acreo.
    Stable thin film encapsulation of acceleration sensors using polycrystalline silicon as sacrificial encapsulation layer2004Ingår i: Sensors and Actuators A-Physical, ISSN 0924-4247, E-ISSN 1873-3069, Vol. 114, s. 355-361Artikel i tidskrift (Refereegranskat)
  • 229. Höglund, L
    et al.
    Holtz, P O
    Pettersson, H
    Asplund, C
    Wang, Q
    RISE., Swedish ICT, Acreo.
    Almqvist, S
    Malm, H
    Petrini, E
    Andersson, J Y
    RISE., Swedish ICT, Viktoria.
    Bias mediated tuning of the detection wavelength in asymmetrical quantum dots-in-a-well infrared photodetectors2008Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 93, s. 203512-Artikel i tidskrift (Refereegranskat)
  • 230. Höglund, L
    et al.
    Holtz, P O
    Pettersson, H
    Asplund, C
    Wang, Q
    RISE., Swedish ICT, Acreo.
    Almqvist, S
    Smuk, S
    Petrini, E
    Andersson, JY
    RISE., Swedish ICT, Viktoria.
    Bias temperature dependence of the escape processes in quantum dots-in-a-well infrared photodetectors2008Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 93, s. 1035201-Artikel i tidskrift (Refereegranskat)
  • 231. Höglund, L
    et al.
    Holtz, P O
      Pettersson, H
    Asplund, C
    Wang, Q
    RISE., Swedish ICT, Acreo.
    Malm, H
    Almqvist, S
    Petrini, E
    Andersson, J Y
    RISE., Swedish ICT, Viktoria.
    Optical pumping as artificial doping in quantum dots-in-a-well infrared photodetectors2009Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, s. 53503-Artikel i tidskrift (Refereegranskat)
  • 232. Höglund, L
    et al.
    Karlsson, K F
    Holtz, P O
    Pettersson, H
    Pistol, M E
    Wang, Q
    RISE., Swedish ICT, Acreo.
    Almqvist, S
    Asplund, C
    Malm, H
    Petrini, E
    Andersson, J Y
    RISE., Swedish ICT, Viktoria.
    Energy level scheme of InAs/InxGa1?xAs/GaAs quantum-dots-in-a-well infrared photodetector structures2010Ingår i: PHYSICAL REVIEW, Vol. b82, s. 35314-Artikel i tidskrift (Refereegranskat)
  • 233. Isaksson, J
    et al.
    Kjäll, P
    RISE., Swedish ICT, Acreo.
    Nilsson, D
    Robinson, N
    Berggren, M
    Richter-Dahlfors, A
    Electronic control of Ca2+ signalling in neuronal cells using an organic electronic ion pump2007Ingår i: Nature Materials_x000D_, Vol. 6, nr 9, s. 673-Artikel i tidskrift (Refereegranskat)
  • 234. Isaksson, J
    et al.
    Nilsson, D
    Kjall, P
    RISE., Swedish ICT, Acreo.
    Robinson, N D
    Richter-Dahlfors, A
    Berggren, M
    Electronically Controlled Ph Gradients Proton Oscillations2008Ingår i: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 9, s. 303-309Artikel i tidskrift (Refereegranskat)
  • 235.
    Jacobsen, G
    RISE., Swedish ICT, Acreo.
    Error-rate floors in intradyne QPSK systems with quadruple phase extraction – comparison of block sliding Processor Unit update2011Ingår i: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 31, s. 180-3Artikel i tidskrift (Refereegranskat)
  • 236.
    Jacobsen, G
    RISE., Swedish ICT, Acreo.
    Laser phase noise induced error-rate floors in differential n-level phase-shift-keying coherent receivers2010Ingår i: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 46, nr 10, s. 698-700Artikel i tidskrift (Refereegranskat)
  • 237.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Aurelius, A
    Berntson, A
    RISE., Swedish ICT, Acreo.
    BER Model for Rx ISI Effects in WDM Systems Accounting for General LPF Impulse Responses for Correlation of Quadrature Polarization Noise Contributions2007Ingår i: Journal of Optical Communications, Vol. 28, nr 1, s. 52-57Artikel i tidskrift (Refereegranskat)
  • 238.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Carlsson, A
    Berntson, A
    RISE., Swedish ICT, Acreo.
    New rigorous model for Rx ISI effects in WDM systems2004Ingår i: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 25, nr 6, s. 241-45Artikel i tidskrift (Refereegranskat)
  • 239.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Gillner, L
    Fransson, O
    On the use of OSNR for BER monitoring in optical networks2000Ingår i: Journal of Optical Communication, Vol. 21, s. 20-Artikel i tidskrift (Refereegranskat)
  • 240.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Kazovsky, LG
    Xu, T
    Popov, S
    Li, J
    RISE., Swedish ICT, Acreo.
    Zhang, Y
    RISE., Swedish ICT, Acreo.
    Friberg, AT
    Phase noise influence in optical OFDM systems employing RF pilot tone for phase noise cancellation2011Ingår i: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 32, s. 141-5Artikel i tidskrift (Refereegranskat)
  • 241.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Lidon, M
    Xu, T
    Popov, S
    Friberg, AT
    Zhang, Y
    RISE., Swedish ICT, Acreo.
    Influence of Pre- Post-compensation of Chromatic Dispersion on Equalization Enhanced Phase Noise in Coherent Multilevel Systems2011Ingår i: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 32Artikel i tidskrift (Refereegranskat)
  • 242.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Persson, U
    Gillner, L
    Vanin, E
    RISE., Swedish ICT, Acreo.
    Wingstrand, S
    Pump power dependent black box EDFA model2000Ingår i: Journal of Optical Communication, Vol. 21, s. 675-Artikel i tidskrift (Refereegranskat)
  • 243.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Vanin, E
    RISE., Swedish ICT, Acreo.
    Novel optical direct-detection D16PSK Gray code receiver using two interferometers simple multilevel electrical processing2009Ingår i: J. Opt. Commun., Vol. 31, nr 1Artikel i tidskrift (Refereegranskat)
  • 244.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Vanin, E
    RISE., Swedish ICT, Acreo.
    Forzati, M
    RISE., Swedish ICT, Acreo.
    Wang, L
    Practical design model of DnPSK systems using direct BER counting rigorous BER modeling2008Ingår i: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 29, nr 4, s. 226-Artikel i tidskrift (Refereegranskat)
  • 245.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Wildhagen, P
    A general rigorous WDM receiver model targeting 10 - 40 Gb/s channel bit-rates2001Ingår i: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 19, s. 966-Artikel i tidskrift (Refereegranskat)
  • 246.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Xu, T
    Popov, S
    Li, J
    RISE., Swedish ICT, Acreo.
    Friberg, AT
    Zhang, Y
    RISE., Swedish ICT, Acreo.
    EEPN CD study for coherent optical nPSK nQAM systems with RF pilot based phase noise compensation2012Ingår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, nr 8, s. 8862-70Artikel i tidskrift (Refereegranskat)
  • 247.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Xu, T
    Popov, S
    Li, J
    RISE., Swedish ICT, Acreo.
    Friberg, AT
    Zhang, Y
    RISE., Swedish ICT, Acreo.
    Receiver implemented RF pilot tone phase noise mitigation in coherent optical nPSK nQAM systems2011Ingår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, nr 15, s. 14487-94Artikel i tidskrift (Refereegranskat)
  • 248.
    Jacobsen, G
    et al.
    RISE., Swedish ICT, Acreo.
    Xu, T
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Popov, S.
    KTH Royal Institute of Technology, Sweden.
    Sergeyev, S.
    Aston University, UK.
    Phase noise influence in coherent optical DnPSK systems with DSP based dispersion compensation2014Ingår i: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 35, nr 1, s. 57-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We present a comparative study of the influence of dispersion induced phase noise for n-level PSK systems. From the analysis, we conclude that the phase noise influence for classical homodyne/heterodyne PSK systems is entirely determined by the modulation complexity (expressed in terms of constellation diagram) and the analogue demodulation format. On the other hand, the use of digital signal processing (DSP) in homodyne/intradyne systems renders a fiber length dependence originating from the generation of equalization enhanced phase noise. For future high capacity systems, high constellations must be used in order to lower the symbol rate to practically manageable speeds, and this fact puts severe requirements to the signal and local oscillator (LO) linewidths. Our results for the bit-error-rate (BER) floor caused by the phase noise influence in the case of QPSK, 16PSK and 64PSK systems outline tolerance limitations for the LO performance: 5 MHz linewidth (at 3-dB level) for 100 Gbit/s QPSK; 1 MHz for 400 Gbit/s QPSK; 0.1 MHz for 400 Gbit/s 16PSK and 1 Tbit/s 64PSK systems. This defines design constrains for the phase noiseimpact in distributed-feed-back (DFB) or distributed-Bragg-reflector (DBR) semiconductor lasers, that would allow moving the system capacity from 100 Gbit/s system capacity to 400 Gbit/s in 3 years (1 Tbit/s in 5 years). It is imperative at the same time to increase the analogue to digital conversion (ADC) speed such that the single quadrature symbol rate goes from today's 25 GS/s to 100 GS/s (using two samples per symbol). 

  • 249. Jaskorzynska, B
    et al.
    Sergeyev, S
    RISE., Swedish ICT, Acreo.
    Swillo, M
    Khoptyar, D
    Nonlinear upconversion rate in Er-doped fibers2001Ingår i: Acta Physica Polonica A_x000D_, Vol. 99, s. 147-Artikel i tidskrift (Refereegranskat)
  • 250. Jason, J
    et al.
    Rugel, P
    Tarasenko, O
    RISE., Swedish ICT, Acreo.
    Margulis, W
    RISE., Swedish ICT, Acreo.
    Nilsson, HE
    Temperature characteristics of the birefringence properties of filled side-hole fibers2013Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 52, nr 21, s. 5208-15Artikel i tidskrift (Refereegranskat)
2345678 201 - 250 av 636
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