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  • 1. Jia, Shi
    et al.
    Pang, Xiaodan
    KTH, School of Information and Communication Technology (ICT). RISE Acreo AB, NETLAB, SE-16425 Kista, Sweden.
    Ozolins, Oskars
    Yu, Xianbin
    Hu, Hao
    Yu, Jinlong
    Guan, Pengyu
    Da Ros, Francesco
    Popov, Sergei
    KTH, School of Information and Communication Technology (ICT).
    Jacobsen, Gunnar
    Galili, Michael
    Morioka, Toshio
    Zibar, Darko
    Oxenlowe, Leif K.
    0.4 THz Photonic-Wireless Link With 106 Gb/s Single Channel Bitrate2018In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 36, no 2, p. 610-616Article in journal (Refereed)
    Abstract [en]

    To accommodate the demand of exponentially increased global wireless data traffic, the prospective data rates for wireless communication in the market place will soon reach 100 Gb/s and beyond. In the lab environment, wireless transmission throughput has been elevated to the level of over 100 Gb/s attributed to the development of photonic-assisted millimeter wave and terahertz (THz) technologies. However, most of recent demonstrations with over 100 Gb/s data rates are based on spatial or frequency division multiplexing techniques, resulting in increased system's complexity and energy consumption. Here, we experimentally demonstrate a single channel 0.4 THz photonic-wireless link achieving a net data rate of beyond 100 Gb/s by using a single pair of THz emitter and receiver, without employing any spatial/frequency division multiplexing techniques. The high throughput up to 106 Gb/s within a single THz channel is enabled by combining spectrally efficient modulation format, ultrabroadband THz transceiver and advanced digital signal processing routine. Besides that, our demonstration from system-wide implementation viewpoint also features high transmission stability, and hence shows its great potential to not only decrease the system's complexity, butalsomeet the requirements of prospective data rates for bandwidth-hungryshort-range wireless applications.

  • 2.
    Puttnam, Benjamin J.
    et al.
    NICT, Photon Network Syst Lab, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Luis, Ruben S.
    NICT, Photon Network Syst Lab, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Rademacher, Georg
    NICT, Photon Network Syst Lab, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Galdino, Lidia
    UCL, Opt Networks Grp, Torrington Pl, London W E 7JE, England..
    Lavery, Domanic
    UCL, Opt Networks Grp, Torrington Pl, London W E 7JE, England..
    Eriksson, Tobias A.
    KTH, School of Engineering Sciences (SCI), Applied Physics. NICT, Photon Network Syst Lab, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan.
    Awaji, Yoshinari
    NICT, Photon Network Syst Lab, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Furukawa, Hideaki
    NICT, Photon Network Syst Lab, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Bayvel, Polina
    UCL, Opt Networks Grp, Torrington Pl, London W E 7JE, England..
    Wada, Naoya
    NICT, Photon Network Syst Lab, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    0.596 Pb/s S, C, L-Band Transmission in a 125 mu m Diameter 4-core Fiber Using a Single Wideband Comb Source2020In: 2020 Optical Fiber Communications Conference and Exposition (OFC), IEEE, 2020Conference paper (Refereed)
    Abstract [en]

    We demonstrate 596.4 Tb/s over a standard cladding diameter fiber with 4 single-mode cores, using a single wideband optical comb source to provide 25 GHz spaced carriers over 120 nm range across S, C and L bands.

  • 3. Puttnam, B. J.
    et al.
    Luís, R. S.
    Rademacher, G.
    Galdino, L.
    Lavery, D.
    Eriksson, Tobias A.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Awaji, Y.
    Furukawa, H.
    Bayvel, P.
    Wada, N.
    0.596 Pb/s S, C, L-band transmission in a 125µm diameter 4-core fiber using a single wideband comb source2020In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2020Conference paper (Refereed)
    Abstract [en]

    We demonstrate 596.4 Tb/s over a standard cladding diameter fiber with 4 single-mode cores, using a single wideband optical comb source to provide 25 GHz spaced carriers over 120 nm range across S, C and L bands. OFC 2020

  • 4.
    Puttnam, Benjamin J.
    et al.
    Natl Inst Informat & Commun Technol, Network Syst Inst, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Luis, Ruben S.
    Natl Inst Informat & Commun Technol, Network Syst Inst, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Rademacher, Georg
    Natl Inst Informat & Commun Technol, Network Syst Inst, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Galdino, Lidia
    UCL, Opt Net Works Grp, Torrington Pl, London W E 7JE, England..
    Lavery, Domanic
    UCL, Opt Net Works Grp, Torrington Pl, London W E 7JE, England..
    Eriksson, Tobias A.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Awaji, Yoshinari
    Natl Inst Informat & Commun Technol, Network Syst Inst, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Furukawa, Hideaki
    Natl Inst Informat & Commun Technol, Network Syst Inst, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Bayvel, Polina
    UCL, Opt Net Works Grp, Torrington Pl, London W E 7JE, England..
    Wada, Naoya
    Natl Inst Informat & Commun Technol, Network Syst Inst, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    0.61 Pb/s S, C, and L-Band Transmission in a 125 mu m Diameter 4-Core Fiber Using a Single Wideband Comb Source2021In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 39, no 4, p. 1027-1032Article in journal (Refereed)
    Abstract [en]

    We investigate high-throughput, multi-band transmission in a 4-core multi-core fiber (MCF) with the same 125 mu m cladding diameter of standard single-mode fiber (SMF). A single wideband comb source is used to transmit up to 561 wavelength channels with 25 GHz spacing over a 120 nm bandwidth in S, C, and L bands. We demonstrate a maximum decoded throughput of 610 Tb/s in PDM-256QAM and PDM-64QAM signals over a 54 km fiber, transmitting more than 155 Tb/s in a single core and measuring a per-core average throughput exceeding record transmission demonstrations in SMF. In addition, we use noise loading measurements to characterize the achievable signal quality across the wideband transmitter. These results show that a single comb source can enable high-spectral efficiency modulation over wide bandwidths and further that low-core count homogeneous MCF technology can offer the same transmission performance as single-mode fibers without sacrificing mechanical reliability, and still offering the benefits of shared resources and greater efficiency that drives SDM technologies.

  • 5.
    Puttnam, Benjamin J.
    et al.
    NICT, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Rademacher, Georg
    NICT, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Luis, Ruben S.
    NICT, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Eriksson, Tobias A.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Klaus, Werner
    NICT, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Awaji, Yoshinari
    NICT, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Wada, Naoya
    NICT, 4-2-1 Nukui Kitamachi, Koganei, Tokyo 1848795, Japan..
    Maeda, Koichi
    Furukawa Elect Corp Ltd, 6 Yawata Kaigandori, Ichihara, Chiba 2908555, Japan..
    Takasaka, Shigehiro
    Furukawa Elect Corp Ltd, 6 Yawata Kaigandori, Ichihara, Chiba 2908555, Japan..
    Sugizaki, Ryuichi
    Furukawa Elect Corp Ltd, 6 Yawata Kaigandori, Ichihara, Chiba 2908555, Japan..
    0.715 Pb/s Transmission over 2,009.6 km in 19-core cladding pumped EDFA amplified MCF link2019In: 2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), IEEE , 2019Conference paper (Refereed)
    Abstract [en]

    We demonstrate 0.715 Pb/s recirculating transmission through 19 cores of 31.4 km MCF amplified with C+L-band, cladding-pumped, multi-core EDFAs; transmitting 345x24.5 GBd PDM-16QAM signals over 2009.6 km for 1.44 Exb/sxkm throughput-distance product.

  • 6.
    Puttnam, B. J.
    et al.
    NICT, 4-2-1, Nukui, Kitamachi, Koganei, Tokyo, 184-8795, Japan bFurukawa Electric co., Ltd., 6, Yawata-kaigandori, Ichihara, Chiba, 290-8555, Japan.
    Rademacher, G.
    NICT, 4-2-1, Nukui, Kitamachi, Koganei, Tokyo, 184-8795, Japan bFurukawa Electric co., Ltd., 6, Yawata-kaigandori, Ichihara, Chiba, 290-8555, Japan.
    Luís, R. S.
    NICT, 4-2-1, Nukui, Kitamachi, Koganei, Tokyo, 184-8795, Japan bFurukawa Electric co., Ltd., 6, Yawata-kaigandori, Ichihara, Chiba, 290-8555, Japan.
    Eriksson, Tobias A.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Klaus, W.
    NICT, 4-2-1, Nukui, Kitamachi, Koganei, Tokyo, 184-8795, Japan.
    Awaji, Y.
    NICT, 4-2-1, Nukui, Kitamachi, Koganei, Tokyo, 184-8795, Japan.
    Wada, N.
    NICT, 4-2-1, Nukui, Kitamachi, Koganei, Tokyo, 184-8795, Japan.
    Maeda, K.
    Furukawa Electric co., Ltd., 6, Yawata-kaigandori, Ichihara, Chiba, 290-8555, Japan.
    Takasaka, S.
    Furukawa Electric co., Ltd., 6, Yawata-kaigandori, Ichihara, Chiba, 290-8555, Japan.
    Sugizaki, R.
    Furukawa Electric co., Ltd., 6, Yawata-kaigandori, Ichihara, Chiba, 290-8555, Japan.
    0.715 Pb/s transmission over 2,009.6 km in 19-core cladding pumped EDFA amplified MCF link2019In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2019Conference paper (Refereed)
    Abstract [en]

    We demonstrate 0.715 Pb/s recirculating transmission through 19 cores of 31.4 km MCF amplified with C+L-band, cladding-pumped, multi-core EDFAs; transmitting 345×24.5 GBd PDM-16QAM signals over 2009.6 km for 1.44 Exb/s×km throughput-distance product. 

  • 7. Gottlob, H. D. B.
    et al.
    Echtermeyer, T.
    Schmidt, M.
    Mollenhauer, T.
    Efavi, J. K.
    Wahlbrink, T.
    Lemme, Max C.
    AMO GmbH, AMICA, Aachen, Germany.
    Czernohorsky, M.
    Bugiel, E.
    Fissel, A.
    Osten, H. J.
    Kurz, H.
    0.86-nm CET gate stacks with epitaxial Gd2O3 high-k dielectrics and FUSINiSi metal electrodes2006In: IEEE Electron Device Letters, ISSN 0741-3106, E-ISSN 1558-0563, Vol. 27, no 10, p. 814-816Article in journal (Refereed)
    Abstract [en]

    In this letter, ultrathin gadolinium oxide (Gd2O3) high-kappa gate dielectrics with complementary-metal-oxide-semiconductor (CMOS)-compatible fully silicided nickel-silicide metal gate electrodes are reported for the first time. MOS capacitors with a Gd2O3 thickness of 3.1 nm yield a capacitance equivalent oxide thickness of CET = 0.86 nm. The extracted dielectric constant is kappa =-13-14. Leakage currents and equivalent oxide thicknesses of this novel gate stack meet the International Technology Roadmap for Semiconductors targets for the near term schedule and beyond.

  • 8. Lindberg, H
    et al.
    Strassner, Martin
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Gerster, E
    Larsson, A
    0.8W optically pumped vertical external cavity surface emitting laser operating CW at 1550 nm2004In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 40, no 10, p. 601-602Article in journal (Refereed)
    Abstract [en]

    An InP based optically pumped vertical external cavity surface emitting laser has been designed and optimised for emission at 1550 nm. To overcome thermal limitations an intra-cavity synthetic diamond heatspreader is bonded to the gain structure. The laser produces 780 mW at -30degreesC and 100 mW at 20degreesC in a near Gaussian beam (M-2 < 1.2).

  • 9. Ranjbar, Parviz Rashidi
    et al.
    Abbasi, Alireza
    Vafakish, Bahareh
    Fischer, Andreas
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Inorganic Chemistry.
    1- (2-Hydroxy-1-naphthyl)(phenyl)methyl -2-naphthol ethanol solvate2007In: Acta Crystallographica Section E: Structure Reports Online, E-ISSN 1600-5368, Vol. 63, p. O2093-O2094Article in journal (Refereed)
    Abstract [en]

    In the title compound, C27H20O2 center dot C2H6O, intra- and intermolecular O-H center dot center dot center dot O hydrogen bonds link the molecules and seem to be effective in the stabilization of the crystal structure. All the H atoms in the hydroxyl groups are disordered.

  • 10. Crespi, F. C. L.
    et al.
    Bracco, A.
    Nicolini, R.
    Lanza, E. G.
    Vitturi, A.
    Mengoni, D.
    Leoni, S.
    Benzoni, G.
    Blasi, N.
    Boiano, C.
    Bottoni, S.
    Brambilla, S.
    Camera, F.
    Corsi, A.
    Giaz, A.
    Million, B.
    Pellegri, L.
    Vandone, V.
    Wieland, O.
    Bednarczyk, P.
    Ciemala, M.
    Kmiecik, M.
    Krzysiek, M.
    Maj, A.
    Bazzacco, D.
    Bellato, M.
    Birkenbach, B.
    Bortolato, D.
    Calore, E.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    de Angelis, G.
    Desesquelles, P.
    Eberth, J.
    Farnea, E.
    Gadea, A.
    Goergen, A.
    Gottardo, A.
    Hess, H.
    Isocrate, R.
    Jolie, J.
    Jungclaus, A.
    Kempley, R. S.
    Labiche, M.
    Menegazzo, R.
    Michelagnoli, C.
    Molini, P.
    Napoli, D. R.
    Pullia, A.
    Quintana, B.
    Recchia, F.
    Reiter, P.
    Sahin, E.
    Siem, S.
    Soederstroem, P. -A
    Stezowski, O.
    Theisen, Ch.
    Ur, C.
    Valiente-Dobon, J. J.
    1(-) and 2(+) discrete states in Zr-90 populated via the (O-17, O-17 'gamma) reaction2015In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 91, no 2, article id 024323Article in journal (Refereed)
    Abstract [en]

    2(+) and 1(-) states in Zr-90 were populated via the (O-17, O-17 'gamma) reaction at 340 MeV. The gamma decay was measured with high resolution using the AGATA (advanced gamma tracking array demonstrator array). Differential cross sections were obtained at few different angles for the scattered particle. The results of the elastic scattering and inelastic excitation of 2(+), 3(,)(-) and 1(-) states are compared with distorted-wave Born approximation (DWBA) calculations, using both the standard collective form factor and a form factor obtained by folding microscopically calculated transition densities. This allowed to extract the isoscalar component of the 1(-) state at 6.424 MeV. The comparison of the present (17O, 17O 'gamma) data with existing (gamma,gamma') and (p, p') data in the corresponding region of the gamma continuum (6-11 MeV), characterized by a large E1 component, shows completely different behaviors of the cross section as a function of the nuclear excitation energy. The comparison of the data with DWBA calculations suggests a decrease of the isoscalar strength in the cross section with increasing excitation energy.

  • 11.
    Andersson, Fredrik
    KTH, Superseded Departments (pre-2005), Chemistry.
    1. Asymmetric aldol and alkylation reactions using pyrrolidine-based chiral auxiliaries 2. Syntheses of pine sawfly pheromone precursors and structurally related compounds2002Licentiate thesis, comprehensive summary (Other scientific)
    Abstract [en]

    This thesis describes the syntheses of the 1-propionylatedauxiliaries (S)-(− )-2-(pyrrolidin-2-yl)propan-2-ol and (S)-(− )-2-(1-methoxy-1-methylethyl)pyrrolidine andtheir use in asymmetric aldol and alkylation reactions. Thesynthesis of 1-propionylated (2S,4R) 2-{4-[(tert-butyldimethylsilyl)oxy]pyrrolidin-2-yl}propan-2-olis also described. The effects on the stereoselectivity, byvariations of solvent, temperature, Lewis acids as additive aswell as the amount of additive are studied. None of thepropionylated auxiliaries exhibited remarkable selectivity foreither diastereomer in aldol reactions with benzaldehyde. Bestresults were obtained with SnCl2as additive giving asyn:antiratio up to 73:27, and Cp2ZrCl2and Cp2TiCl2giving a reversedsyn:antiratio up to 27:73 for the former auxiliary. Highselectivity for onesynand oneantidiastereomer were obtained with TMS-Cl as anadditive. The latter propionylated auxiliary was less selectivethan the former. Reversal insyn/antiselectivity was observed when Cp2ZrCl2and Cp2TiCl2was used with asyn:antiratio = 68:32 and 33:67. In alkylation reactions,the former propionylated auxiliary showed lower and similarselectivity with benzyl bromide andn-butyl iodide, compared with the literature. Enhancedselectivity was obtained in the benzylation reactions (78% and84% diastereomeric excess), with LiCl and Cp2ZrCl2as additives. Cp2ZrCl2and Cp2TiCl2resulted in lower selectivity in butylationreactions. High selectivity was obtained for the latterpropionylated auxiliary and with a reversal in selectivity,compared with the former. Benzylation reactions resulted in82-98% diastereomeric excess, with the highest selectivity ofCp2ZrCl2as additive. In butylation reactions the use ofLiCl resulted in highest diastereomeric excess (94%).

    The second part of the thesis describes the syntheses ofcompounds related to sex pheromones of pine sawflies. (2S,6R)-(− )-2,6-Dimethyl-1-octanol, a building blockin the synthesis of the sex pheromone of the pine sawflyMicrodiprion pallipesin high stereoisomeric purity wasprepared from the optically pure (S)-citronellal. Lipase-catalysed (Amano PS and Im-CRL)kinetic separations, based on selective acylation andesterification of (2R/S,6R)-2,6-dimethyl-1-octanol and the corresponding acidwere the key steps in this sequence. The alcohol precursors tosex pheromones ofDiprion nipponica,Macrodiprion nemoralisandMicrodiprion pallipeswere synthesised as racemicmixtures in moderate yields. Stereoisomeric mixtures of severalmethyl-branched long-chain 2-alkanols, structurally related tosex pheromone alcohol precursors of pine sawfly species, werealso synthesised in moderate yields. The key reaction in thesyntheses was the ring opening of&#947-butyrolactonesusing different alkyl lithiums as nucleophiles.

    Keywords: Chiral auxiliary, Stereoselectivity, Lewisacid, Aldol, Alkylation, Sex pheromone, Pine sawfly, Lipase,Synthesis, Diprion nipponica, Macrodiprion nemoralis,Microdiprion pallipes

  • 12. Wang, Y.
    et al.
    Alessi, D.
    Martz, Dale
    Electrical and Computer Engineering Department, Colorado State University.
    Berrill, M.
    Luther, B. M.
    Rocca, J. J.
    1 Hz Operation of a Gain-Saturated 10.9 nm Table-Top laser2010In: 2010 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (QELS), 2010Conference paper (Refereed)
    Abstract [en]

    We report a gain-saturated 10.9nm table-top soft x-ray laser operating at 1 Hz repetition rate. With an average power of 1 mu W and pulse energy up to similar to 2 mu J this laser extends a shorter wavelength the ability to conduct table-top laser experiments.

  • 13.
    Mattsson, Helena
    KTH, School of Architecture and the Built Environment (ABE), Architecture, History and Theory of Architecture.
    1% love and devotion på Ulleråkers sjukhus2006Collection (editor) (Other academic)
    Abstract [sv]

    Institutionen befinner sig i kris. Det gäller den politiska institutionen, den juridiska, den sociala, den polisiära, skolan, pensionssystemet, fritidsgårdarna... Och det gäller i högsta grad konstinstitutionen och vårdinstitutionen.Psykos- och rehabiliteringsavdelningarna 109 och 110 på Ulleråkers sjukhus ska renoveras. Enligt riktlinjer ska 1 % av byggkostnaden avsättas till konstnärlig gestaltning. I detta fall innebär det 210 000 kronor. Konstnärsgruppen love and devotion tar sig an det konstnärliga utsmyckningsuppdraget genom att ställa vårdmiljön snarare än konstobjektet i centrum.Inom den psykiatriska vården har antalet vårdplatser drastiskt minskat den senaste 10-årsperioden. Samtidigt är den fysiska vårdmiljön undermålig och avhandlas i stort sett aldrig. Utifrån en mängd olika perspektiv diskuterar denna bok frågor kring institutionens kris, liksom vårdens och konstens villkor i dagens samhälle.

  • 14. Chen, M. X.
    et al.
    Perzon, E.
    Andersson, M. R.
    Marcinkevicius, Saulius
    KTH, Superseded Departments (pre-2005), Physics.
    Jonsson, S. K. M.
    Fahlman, M.
    Berggren, M.
    1 micron wavelength photo- and electroluminescence from a conjugated polymer2004In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 84, no 18, p. 3570-3572Article in journal (Refereed)
    Abstract [en]

    We report photo- and electroluminescence from an alternating conjugated polymer consisting of fluorene units and low-band gap donor-acceptor-donor (D-A-D) units. The D-A-D segment includes two electron-donating thiophene rings combined with a thiadiazolo-quinoxaline unit, which is electron withdrawing to its nature. The resulting polymer is conjugated and has a band gap of 1.27 eV. The corresponding electro- and photoluminescence spectra both peak at approximately 1 mum. Light-emitting diodes, based on a single layer of the polymer, demonstrated external quantum efficiencies from 0.03% to 0.05%.

  • 15. Suomalainen, Soile
    et al.
    Guina, Mircea
    Hakulinen, Tommi
    Okhotnikov, Oleg
    Euser, T.
    Marcinkevicius, Saulius
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    1 µm saturable absorber with recovery time reduced by lattice mismatch2006In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 89, no 7, p. 071112-1-071112-3Article in journal (Refereed)
    Abstract [en]

    Metamorphic growth of lattice mismatched InGaP on GaAs has been used to fabricate a fast semiconductor saturable absorber mirror operating at the 1060 nm wavelength range. The absorption recovery time could be reduced to 5 ps without deteriorating the nonlinear absorption properties. The device was used to demonstrate self-starting operation of a mode-locked Yb-doped fiber laser and obtain high quality picosecond pulses

  • 16.
    Sundberg, Christel
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
    Persson, Mats
    KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
    Wikner, Jacob
    Linköping university.
    Danielsson, Mats
    KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
    1 μm spatial resolution in silicon photon-counting CT detectors by measuring charge diffusion2020In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE, 2020, Vol. 11312, article id 113120EConference paper (Other academic)
    Abstract [en]

    One of the existing prototype detector systems for full-field photon-counting CT is a silicon detector developed by our group. Spatial resolution is clinically important to resolve small details and can enable more efficient phase-contrast imaging. However, improving the resolution is difficult as decreasing the pixel size is associated with technical challenges. By integrating CMOS electronics into the silicon sensor, it is possible to reduce the pixel size drastically while also introducing on-sensor data processing capabilities. In this work, we evaluate the feasibility of measuring the charge cloud shape of Compton interactions in a silicon strip detector to increase the spatial resolution. With an incident spectrum of 140 kVp, Compton interactions constitute 66.2% of the detected interactions. By combining a Monte Carlo photon simulation with a charge transport model, we study the charge cloud distributions and induced currents as functions of the interaction position. For a simulated silicon strip detector with a pixel size of 12×500 µm2, we present a method in which the interaction position can be determined. For an ideal case without electronic noise an average absolute error of 0.65 µm is obtained in the direction along the wafer and 13.08 µm in the trans-wafer direction. With simulated electronic noise and a lowest threshold of 0.88 keV the corresponding values are 1.38 µm and 122.83 µm. Our results show that the proposed method has the potential to very significantly increase the spatial resolution in a full-field photon-counting detector for CT. 

  • 17.
    Isaksson, Mats
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Chacinski, Marek
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Kjebon, Olle
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wesström, J. -O
    10 Gb/s direct modulation of 40 nm tunable modulated-grating Y-branch laser2006In: OFC/NFOEC Technical Digest, Optical Society of America, 2006Conference paper (Refereed)
    Abstract [en]

    High speed properties of a directly modulated widely tunable MG-Y laser have been evaluated. Small signal response and 10 Gb/s NRZ modulation were performed within the 40 nm tuning range.

  • 18. Isaksson, M.
    et al.
    Chacinski, Marek
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Kjebon, Olle
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Schatz, Richard
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wesstrom, J. -O
    10 Gb/s direct modulation of 40 nm tunable modulated-grating Y-branch laser2005In: Optical Fiber Communication Conference, 2005. Technical Digest. OFC/NFOEC, 2005, Vol. 2, p. 117-119Conference paper (Refereed)
    Abstract [en]

    High speed properties of a directly modulated widely tunable MG-Y laser have been evaluated. Small signal response and 10 Gb/s NRZ modulation were performed within the 40 nm tuning range.

  • 19.
    Salemi, Arash
    et al.
    KTH.
    Elahipanah, Hossein
    KTH, School of Information and Communication Technology (ICT), Electronics, Integrated devices and circuits.
    Zetterling, Carl-Mikael
    KTH, School of Information and Communication Technology (ICT), Electronics, Integrated devices and circuits.
    Östling, Mikael
    KTH, School of Information and Communication Technology (ICT), Electronics, Integrated devices and circuits.
    10+ kV implantation-free 4H-SiC PiN diodes2017In: 11th European Conference on Silicon Carbide and Related Materials, ECSCRM 2016, Trans Tech Publications Ltd , 2017, p. 423-426Conference paper (Refereed)
    Abstract [en]

    Implantation-free mesa etched 10+ kV 4H-SiC PiN diodes are fabricated, measured and analyzed by device simulation. An area-optimized junction termination extension (O-JTE) is implemented in order to achieve a high breakdown voltage. The diodes design allows a high breakdown voltage of about 19.3 kV according to simulations by Sentaurus TCAD. No breakdown voltage is recorded up to 10 kV with a very low leakage current of 0.1 μA. The current spreading within the thick drift layer is considered and a voltage drop (VF) of 8.3 V and 11.4 V are measured at 50 A/cm2 and 100 A/cm2, respectively. The differential on-resistance (Diff. Ron) of 67.7 mΩ.cm2 and 55.7 mΩ.cm2 are measured at 50 A/cm2 and 100 A/cm2, respectively.

  • 20.
    Sandin, Per
    KTH, School of Architecture and the Built Environment (ABE), Philosophy and History of Technology.
    10 Moral Paradoxes - By Saul Smilansky2009In: Theoria, ISSN 0040-5825, E-ISSN 1755-2567, Vol. 75, no 1, p. 65-66Article, book review (Refereed)
  • 21.
    Zander, Jens
    KTH, Superseded Departments (pre-2005), Signals, Sensors and Systems.
    10 Years of Radio Communication Systems research at KTH: a retrospect and a look at the future1999Report (Other academic)
  • 22.
    Säfström, Maja
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    100 Days of drawings2016Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis project is based on an attempt to define ”frames for the creativity” withina design process.The idea has been to follow a method of very clear rules, tools and a limited time spanto produce small form giving tasks and spatial investigations.The intention was to shift the focus and demands of the everyday performance ina project - from qualitative abstract expectations - to quantitative tasks with a dailyphysical result as the only requirement.This would insure the production of material that could then be assessed and analysedto feed information, ideas and questions to the forthcoming work.I gave myself the challenge of producing one analog, abstract drawing perday for the 100 days that constitute the thesis period.Making these drawings have lead to a curiosity about how, when and why we perceivedepth in two-dimensional images.Trying to answer these questions has given me a deeper understanding of how theimage is related to our perception of three-dimensional space and architecture.In order to further relate and understand the relevance of this work in thearchitectural field today, I have made a mapping study of how artists and architectsthroughout history have been dealing with these phenomena, in order to learn, teachand achieve various spatial sensations.- Insights that I am looking forward to use and sharein my future work as an architect.

    Download full text (pdf)
    100 days of drawings
  • 23. Sandström, H. E.
    et al.
    Sundin, P.
    Erixon, Mats
    KTH, School of Computer Science and Communication (CSC).
    100% FTTx coverage is economically feasible even in rural <1 people/km 2 areas2012In: Networks and Optical Communications (NOC), 2012 17th European Conference on, IEEE , 2012Conference paper (Refereed)
    Abstract [en]

    Fiber to the end-user (FTTx) has long been considered to be too expensive to be deployed to cover all end users especially those living in the far rural areas. The conclusion after working with some municipalities in Jamtland is now that FTTx is both technically and economically feasible. The architecture tested is an IP-Only broadband network capable of carrying end-user services up to 10/100Gbps to any point in the network. Building such a broadband infrastructure, is feasible mostly due to the fact that cost of standard IP-network components are diminishing and by utilizing novel network designs made possible because the limitations of the old Telecom infrastructure no longer apply and lastly that the take rate of permanent households is close to 100% due to the fact that the copper networks is removed.

  • 24.
    Ozolins, Oskars
    et al.
    RISE Acreo AB, Networking & Transmiss Lab, Kista, Sweden..
    Pang, Xiaodan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics. RISE Acreo AB, Networking & Transmiss Lab, Kista, Sweden..
    Udalcovs, Aleksejs
    RISE Acreo AB, Networking & Transmiss Lab, Kista, Sweden..
    Schatz, Richard
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Westergren, Urban
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Rodrigo Navarro, Jaime
    Kakkar, Aditya
    KTH.
    Nordwall, Fredrik
    Tektronix AB, Stockholm, Sweden..
    Engenhardt, Klaus M.
    Tektronix GmbH, Stuttgart, Germany..
    Chen, Jiajia
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Jacobsen, Gunnar
    RISE Acreo AB, Networking & Transmiss Lab, Kista, Sweden..
    100 Gbaud 4PAM Link for High Speed Optical Interconnects2017In: 43RD EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC 2017), IEEE , 2017Conference paper (Refereed)
    Abstract [en]

    We demonstrate 100 Gbaud 4PAM transmission over 400 meters SMF with monolithically integrated 1550 nm DFB-TWEAM having 100 GHz 3-dB bandwidth with 2 dB ripple. We evaluate its capabilities to enable two lanes 400 GbE client-side links for optical interconnects.

  • 25.
    Ozolins, Oskars
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics. RISE Res Inst Sweden, Networks Unit, S-16440 Kista, Sweden.;Riga Tech Univ, Inst Telecommun, LV-1048 Riga, Latvia..
    Pang, Xiaodan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Udalcovs, Aleksejs
    RISE Res Inst Sweden, Networks Unit, S-16440 Kista, Sweden..
    Schatz, Richard
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Spolitis, Sandis
    Riga Tech Univ, Inst Telecommun, LV-1048 Riga, Latvia.;Riga Tech Univ, Commun Technol Res Ctr, LV-1048 Riga, Latvia..
    Bobrovs, Vjaceslavs
    Riga Tech Univ, Inst Telecommun, LV-1048 Riga, Latvia..
    Jacobsen, Gunnar
    RISE Res Inst Sweden, Networks Unit, S-16440 Kista, Sweden..
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    100 Gbaud On-Off Keying/Pulse Amplitude Modulation Links in C-Band for Short-Reach Optical Interconnects2021In: Applied Sciences, E-ISSN 2076-3417, Vol. 11, no 9, article id 4284Article in journal (Refereed)
    Abstract [en]

    We experimentally evaluate the high-speed on-off keying (OOK) and four-level pulse amplitude modulation (PAM4) transmitter's performance in C-band for short-reach optical interconnects. We demonstrate up to 100 Gbaud OOK and PAM4 transmission over a 400 m standard single-mode fiber with a monolithically integrated externally modulated laser (EML) having 100 GHz 3 dB bandwidth with 2 dB ripple. We evaluate its capabilities to enable 800 GbE client-side links based on eight, and even four, optical lanes for optical interconnect applications. We study the equalizer's complexity when increasing the baud rate of PAM4 signals. Furthermore, we extend our work with numerical simulations showing the required received optical power (ROP) for a certain bit error rate (BER) for the different combinations of the effective number of bits (ENOB) and extinction ratio (ER) at the transmitter. We also show a possibility to achieve around 1 km dispersion uncompensated transmission with a simple decision feedback equalizer (DFE) for a 100 Gbaud OOK, PAM4, and eight-level PAM (PAM8) link having the received power penalty of around 1 dB.

  • 26.
    Ozolins, Oskars
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Zhang, Lu
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Udalcovs, A
    Louchet, H
    Dippon, T
    Gruen, M
    Pang, Xiaodan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Schatz, Richard
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Westergren, Urban
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Xiao, S
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Chen, Jiajia
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    100 Gbaud PAM4 link without EDFA and post-equalization for optical interconnects2019In: IET Conference Publications, Institution of Engineering and Technology (IET) , 2019Conference paper (Refereed)
    Abstract [en]

    We show 100 Gbaud PAM4 400 meters link with performance below the 7% HD-FEC limit of 5x10-3 without optical amplification and post-equalization. We also show 300 Gbps PAM8 line rate transmission over 400 meters of SSMF in C-band. 

  • 27.
    Pang, Xiaodan
    et al.
    RISE ACREO AB; Technical University of Denmark.
    Caballero, Antonio
    Dogadaev, Anton
    Arlunno, Valeria
    Borkowski, Robert
    Pedersen, Jesper S
    Deng, Lei
    Karinou, Fotini
    Roubeau, Fabien
    Zibar, Darko
    Xianbin, Yu
    Monroy, Idelfonso Tafur
    100 Gbit/s hybrid optical fiber-wireless link in the W-band (75–110 GHz)2011In: Optics Express, E-ISSN 1094-4087, Vol. 19, no 25, p. 24944-24949Article in journal (Refereed)
    Abstract [en]

    We experimentally demonstrate an 100 Gbit/s hybrid optical fiber-wireless link by employing photonic heterodyning up-conversion of optical 12.5 Gbaud polarization multiplexed 16-QAM baseband signal with two free running lasers. Bit-error-rate performance below the FEC limit is successfully achieved for air transmission distances up to 120 cm.

  • 28.
    Liu, Kexin
    et al.
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China..
    Jia, Shi
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China..
    Wang, Shiwei
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China..
    Pang, Xiaodan
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Li, Wei
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China..
    Zheng, Shilie
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China..
    Chi, Hao
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China..
    Jin, Xiaofeng
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China..
    Zhang, Xianmin
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China..
    Yu, Xianbin
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China..
    100 Gbit/s THz Photonic Wireless Transmission in the 350-GHz Band With Extended Reach2018In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 30, no 11, p. 1064-1067Article in journal (Refereed)
    Abstract [en]

    In this letter, we experimentally demonstrate terahertz (THz) photonic wireless transmission of high-speed quadrature-phase-shift-keying (QPSK) and 16 quadrature amplitude modulation (16-QAM) signals in the 350-GHz band, with an effort to extend the wireless reach of ultrafast 100 Gbit/s. In the experiment, a narrowband unitraveling-carrier photodiode (UTC-PD) is used for heterodyne generation of THz communication signals, which is transparent to optical modulation formats. Experimental results show that 30 GBd/s QPSK (60 Gbit/s) and 25 GBd/s 16-QAM signals (100 Gbit/s) are successfully transmitted over a 350-GHz wireless link with an extended distance of 2 m. This enhancement is enabled by combining the techniques of employing cutting-edge narrowband UTC-PD as the photomixing THz emitter, spectrally efficient modulation format and advanced digital signal processing algorithms. The achievement makes 100 Gbit/s THz wireless communication systems promising for future smart wireless services.

  • 29.
    Wang, Ke
    et al.
    KTH. Networking and Transmission Laboratory, Acreo AB, SE-164 40, Kista, Electrum 236, Sweden; Beijing Institute of Technology, Haidian District, Beijing 100081, 5 South Zhongguancun, China.
    Li, J.
    Djupsjöbacka, A.
    Chacinski, Marek
    KTH.
    Westergren, Urban
    KTH.
    Popov, Sergei
    KTH.
    Jacobsen, Gunnar
    KTH. Networking and Transmission Laboratory, Acreo AB, SE-164 40, Kista, Electrum 236, Sweden.
    Hurm, V.
    Makon, R. E.
    Driad, R.
    Walcher, H.
    Rosenzweig, J.
    Steffan, A. G.
    Mekonnen, G. G.
    Bach, H. -G
    100 Gb/s Complete ETDM system based on monolithically integrated transmitter and receiver modules2010In: Optics InfoBase Conference Papers, OSA Publishing , 2010Conference paper (Refereed)
    Abstract [en]

    A complete ETDM system based on monolithically integrated transmitter and receiver modules was demonstrated with BER performance below FEC threshold up to 107 Gb/s. ETDM signal at 112 Gb/s with clear eye opening was also observed.

  • 30.
    Wang, Ke
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics. Acreo AB, Kista, Sweden .
    Li, J.
    Djupsjöbacka, A.
    Chacinski, Marek
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Westergren, Urban
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Popov, Sergei
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Jacobsen, Gunnar
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics. Acreo AB, Kista, Sweden .
    Hurm, V.
    Makon, R. E.
    Driad, R.
    Walcher, H.
    Rosenzweig, J.
    Steffan, A. G.
    Mekonnen, G. G.
    Bach, H. -. G.
    100 Gb/s complete ETDM system based on monolithically integrated transmitter and receiver modules2010In: 2010 Conference on Optical Fiber Communication, Collocated National Fiber Optic Engineers Conference, OFC/NFOEC 2010, 2010, p. 5465571-Conference paper (Refereed)
    Abstract [en]

    A complete ETDM system based on monolithically integrated transmitter and receiver modules was demonstrated with BER performance below FEC threshold up to 107 Gb/s. ETDM signal at 112 Gb/s with clear eye opening was also observed.

  • 31.
    Chacinski, Marek
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Westergren, Urban
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics.
    Stoltz, Bjorn
    Driad, Rachid
    Makon, Robert Elvis
    Hurm, Volker
    Steffan, Andreas Gerhard
    100 Gb/s ETDM Transmitter Module2010In: IEEE Journal of Selected Topics in Quantum Electronics, ISSN 1077-260X, E-ISSN 1558-4542, Vol. 16, no 5, p. 1321-1327Article in journal (Refereed)
    Abstract [en]

    Components of a 100 Gb/s transmitter with electrical time-division multiplexing are presented as following: electrical multiplexer, driver amplifier, and large-bandwidth distributed feedback-traveling-wave electro-absorption modulator module. The performance of the parts of the transmitter, as well as the complete chain, is investigated for data operation and transmission in future 100 Gb/s Ethernet (100GbE). Clearly open eye diagrams at 100 Gb/s are demonstrated together with data transmission over 300 m long standard single mode fiber link.

  • 32.
    Wang, Ke
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics. Beijing Institute of Technology, China.
    Li, J.
    Djupsjöbacka, A.
    Popov, Sergei
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Jacobsen, G.
    Makon, R. E.
    Driad, R.
    Walcher, H.
    Steffan, A. G.
    Bach, H. -G
    100 Gb/s OOK transmission through 212 km field SSMF using monolithically integrated ETDM receiver module2009In: 2009 Asia Communications and Photonics Conference and Exhibition, ACP 2009, 2009, p. 5377273-Conference paper (Refereed)
    Abstract [en]

    100 Gb/s on-off-key transmission over 212 km installed standard single mode fibers using an electrical InP-based clock-data-recovery and 1:2 demultiplexer module was demonstrated. Error-free performance was achieved with 1.1 dB OSNR penalty at 10-9 BER after transmission.

  • 33.
    Wang, Ke
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Li, Jie
    Djupsjobacka, Anders
    Popov, Sergei
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Jacobsen, Gunnar
    Makon, Robert Elvis
    Driad, Rachid
    Walcher, Herbert
    Rosenzweig, Josef
    Steffan, Andreas G.
    Mekonnen, G. Giorgis
    Bach, Heinz-Gunter
    Li, Zhuo
    Friberg, Ari T.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    100 Gb/s RZ-OOK transmission through 212 km deployed SSMF using monolithically integrated ETDM receiver module2011In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 284, no 3, p. 782-786Article in journal (Refereed)
    Abstract [en]

    100 Gb/s on-off keying (OOK) transmission over 212 km installed standard single-mode fibers using an Indium Phosphide (InP)-based electrical clock-data-recovery (CDR) and demultiplexer module was demonstrated 5 5 x 10(-11) bit error rate (BER) performance was achieved and 11 dB optical signal-to-noise ratio (OSNR) penalty was required at 10(-9) BER after transmission

  • 34. Ozolins, O.
    et al.
    Iglesias Olmedo, Miguel
    KTH, School of Information and Communication Technology (ICT).
    Pang, X.
    Gaiarin, S.
    Kakkar, A.
    KTH, School of Information and Communication Technology (ICT).
    Udalcovs, A.
    KTH, School of Information and Communication Technology (ICT).
    Engenhardt, K. M.
    Asyngier, T.
    Schatz, R.
    KTH, School of Information and Communication Technology (ICT).
    Li, J.
    Nordwall, F.
    Westergren, U.
    KTH, School of Information and Communication Technology (ICT).
    Zibar, D.
    Popov, S.
    KTH, School of Information and Communication Technology (ICT).
    Jacobsen, G.
    100 GHz EML for high speed optical interconnect applications2016In: European Conference on Optical Communication, ECOC, Institute of Electrical and Electronics Engineers Inc. , 2016, p. 127-129Conference paper (Refereed)
    Abstract [en]

    We report on a 116 Gbit/s OOK, 4PAM and 105 Gbit/s 8PAM optical transmitter using InP-based integrated EML for interconnect applications with up to 30 dB static extinction ratio and over 100 GHz 3 dB bandwidth with 2 dB ripple.

  • 35. Ozolins, Oskars
    et al.
    Pang, Xiaodan
    Iglesias Olmedo, Miguel
    KTH, School of Engineering Sciences (SCI), Applied Physics, Optics and Photonics, OFO.
    Kakkar, Aditya
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Udalcovs, Aleksejs
    Gaiarin, Simone
    DTU Fotonik.
    Navarro, Jaime Rodrigo
    Engenhardt, Klaus M.
    Asyngier, Tadeusz
    Schatz, Richard
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Li, Jie
    Nordwall, Fredrik
    Westergren, Urban
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Zibar, Darko
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Jacobsen, Gunnar
    100 GHz Externally Modulated Laser for Optical Interconnects2017In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 35, no 6, p. 1174-1179Article in journal (Refereed)
    Abstract [en]

    We report on a 116 Gb/s on-off keying (OOK), four pulse amplitude modulation (PAM) and 105-Gb/s 8-PAM optical transmitter using an InP-based integrated and packaged externally modulated laser for high-speed optical interconnects with up to 30 dB static extinction ratio and over 100-GHz 3-dB bandwidth with 2 dB ripple. In addition, we study the tradeoff between power penalty and equalizer length to foresee transmission distances with standard single mode fiber.

  • 36. Rahiminejad, S.
    et al.
    Brazalez, A. A.
    Raza, H.
    Pucci, E.
    Haasl, Sjoerd
    KTH, School of Technology and Health (STH), Centres, Centre for Technology in Medicine and Health, CTMH.
    Kildal, P. -S
    Enoksson, P.
    100 GHz SOI gap waveguides2013In: 2013 Transducers and Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013, 2013, p. 510-513Conference paper (Refereed)
    Abstract [en]

    Two gap waveguide technologies, groove and ridge, are presented here for F-band applications. Three different groove gap waveguide devices and four different ridge gap waveguide devices have been fabricated. All of them were micromachined to achieve the feature size required for the frequency band and fabricated in a single process using SOI wafers. The two types provide a more robust coupling to standard waveguides and high frequency probes. Measurements for most of the devices are shown in this paper, showing robust measurements and good agreement with simulations. More measurements need to be done but the initial ones show the promise both in the manufacturing technique and the coupling.

  • 37. Halawani, Alaa
    et al.
    Li, Haibo
    KTH, School of Computer Science and Communication (CSC), Media Technology and Interaction Design, MID.
    100 lines of code for shape-based object localization2016In: Pattern Recognition, ISSN 0031-3203, E-ISSN 1873-5142, Vol. 60, p. 458-472Article in journal (Refereed)
    Abstract [en]

    We introduce a simple and effective concept for localizing objects in densely cluttered edge images based on shape information. The shape information is characterized by a binary template of the object's contour, provided to search for object instances in the image. We adopt a segment-based search strategy, in which the template is divided into a set of segments. In this work, we propose our own segment representation that we call one-pixel segment (OPS), in which each pixel in the template is treated as a separate segment. This is done to achieve high flexibility that is required to account for intra-class variations. OPS representation can also handle scale changes effectively. A dynamic programming algorithm uses the OPS representation to realize the search process, enabling a detailed localization of the object boundaries in the image. The concept's simplicity is reflected in the ease of implementation, as the paper's title suggests. The algorithm works directly with very noisy edge images extracted using the Canny edge detector, without the need for any preprocessing or learning steps. We present our experiments and show that our results outperform those of very powerful, state-of-the-art algorithms.

  • 38. Ryghaug, M
    et al.
    Subotički, I
    von Wirth, T
    Smeds, Emilia
    Scherrer, A
    Foulds, C
    Bertolini, L
    Beyazit İnce, Eda
    Brand, R
    Cohen-Blankshtain, G
    Dijk, M
    Freudendal-Pedersen, M
    Gössling, S
    Guzik, R
    Kivimaa, P
    Klöckner, C
    Nikolova, H L
    Lis, A
    Marquet, O
    Milakis, D
    Mladenović, M
    Mom, G
    Mullen, C
    Ortar, N
    Pucci, P
    Olivieira, C S
    Schwanen, T
    Seidenglanz, D
    Tuvikene, T
    Wentland, A
    100 Social Sciences and Humanities priority research questions for transport and mobility in Horizon Europe2020Report (Other academic)
    Download full text (pdf)
    Full report
  • 39.
    Wang, Ke
    et al.
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics. Beijing Institute of Technology, China .
    Li, J.
    Djupsjöbacka, A.
    Chaciński, Marek
    KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
    Westergren, Urban
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Photonics.
    Popov, Sergei Yu
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    Jacobsen, G.
    Hurm, V.
    Makon, R. E.
    Driad, R.
    Walcher, H.
    Rosenzweig, J.
    Steffan, A. G.
    Giorgis Mekonnen, G.
    Bach, H. -G
    Li, Z.
    Friberg, Ari
    KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
    100-112 Gbit/s complete ETDM systems based on monolithically integrated transmitter and receiver modules2011In: Journal of Beijing Institute of Technology (English Edition), ISSN 1004-0579, Vol. 20, no 3, p. 410-414Article in journal (Refereed)
    Abstract [en]

    Traditional intensity modulated two-level electrical time-division multiplexing (ETDM) transmission systems working at 100-112 Gbit/s were investigated. The complete ETDM systems based on monolithically integrated transmitter and receiver modules were demonstrated with bit-error-rate (BER) performance of 10-8 at 107 Gbit/s, and near error-free standard forward error correction (FEC) threshold (2×10-3) at 112 Gbit/s. The experiment results showed that directly modulated high-speed ETDM transmission systems with the symbol rates at 100 Gbaud and beyond were promising candidate for cost-effective 100 GbE applications and might be a preform of the next generation of Terabit/s Ethernet.

  • 40.
    Pang, Xiaodan
    et al.
    RISE ACREO AB; Technical University of Denmark.
    Caballero, Antonio
    Deng, Lei
    Yu, Xianbin
    Borkowski, Robert
    Arlunno, Valeria
    Dogadaev, Anton
    Zibar, Darko
    Suhr, L Frejstrup
    Olmos, JJ Vegas
    Monroy, Tafur
    100-Gbps hybrid optical fiber-wireless transmission2013In: 2013 18th OptoElectronics and Communications Conference Held Jointly with 2013 International Conference on Photonics in Switching, OECC/PS 2013, IEICE , 2013, article id 6597503Conference paper (Refereed)
    Abstract [en]

    We present experimental results on using optical transmission technologies such as I&Q modulators, digital coherent receivers, heterodyne up-conversion in fast photodiodes, to generate, transmit and detect high capacity wireless transmission. Both OFDM and QAM modulation formats are tested in the W-achieving capacities up to 100-Gbps with seamless optical fiber-wireless conversion.

  • 41.
    Chaciński, Marek
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP. TE Connectivity, Bruttovägen 7, Järfälla, Sweden .
    Westergren, U.
    100GHz electro-optical modulator chip2011In: Opto-Electron. Commun. Conf., OECC, 2011, p. 59-60Conference paper (Refereed)
    Abstract [en]

    Recent development on high speed electro-optical modulator is presented. The performance of 100GHz modulation bandwidth enabling for 100Gbps On-Off-Keying operation is shown.

  • 42.
    Fei, Chao
    et al.
    Zhejiang Univ, Ningbo Res Inst, Ningbo 315100, Peoples R China.;Zhejiang Univ, Ctr Opt & Electromagnet Res, Natl Engn Res Ctr Opt Instruments, Hangzhou 310058, Peoples R China..
    Wang, Yuan
    Zhejiang Univ, Ctr Opt & Electromagnet Res, Natl Engn Res Ctr Opt Instruments, Hangzhou 310058, Peoples R China..
    Du, Ji
    Zhejiang Univ, Ctr Opt & Electromagnet Res, Natl Engn Res Ctr Opt Instruments, Hangzhou 310058, Peoples R China..
    Chen, Ruilin
    Zhejiang Univ, Ctr Opt & Electromagnet Res, Natl Engn Res Ctr Opt Instruments, Hangzhou 310058, Peoples R China..
    Lv, Nanfei
    Zhejiang Univ, Ctr Opt & Electromagnet Res, Natl Engn Res Ctr Opt Instruments, Hangzhou 310058, Peoples R China..
    Zhang, Guowu
    Zhejiang Univ, Ctr Opt & Electromagnet Res, Natl Engn Res Ctr Opt Instruments, Hangzhou 310058, Peoples R China..
    Tian, Jiahan
    Zhejiang Univ, Ctr Opt & Electromagnet Res, Natl Engn Res Ctr Opt Instruments, Hangzhou 310058, Peoples R China..
    Hong, Xiaojian
    Zhejiang Univ, Ningbo Res Inst, Ningbo 315100, Peoples R China.;Zhejiang Univ, Ctr Opt & Electromagnet Res, Natl Engn Res Ctr Opt Instruments, Hangzhou 310058, Peoples R China..
    He, Sailing
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering. Zhejiang Univ, Ningbo Res Inst, Ningbo 315100, Peoples R China.;Zhejiang Univ, Ctr Opt & Electromagnet Res, Natl Engn Res Ctr Opt Instruments, Hangzhou 310058, Peoples R China..
    100-m/3-Gbps underwater wireless optical transmission using a wideband photomultiplier tube (PMT)2022In: Optics Express, E-ISSN 1094-4087, Vol. 30, no 2, p. 2326-2337Article in journal (Refereed)
    Abstract [en]

    In this paper, a wideband photomultiplier tube (PMT)-based underwater wireless optical communication (UWOC) system is proposed and a comprehensive experimental study of the proposed PMT-based UWOC system is conducted, in which the transmission distance, data rate, and attenuation length (AL) is pushed to 100.6 meters, 3 Gbps, and 6.62, respectively. The receiver sensitivity at 100.6-meter underwater transmission is as low as -40 dBm for the 1.5-Gbps on-off keying (00K) modulation signal. To the best of our knowledge, this is the first Gbps-class UWOC experimental demonstration in >100-meter transmission that has ever been reported. To further minimize the complexity of channel equalization, a sparsity-aware equalizer with orthogonal matching pursuit is adopted to reduce the number of the filter coefficients by more than 50% while keeping slight performance penalty. Furthermore, the performance of the proposed PMT-based LIWOC system in different turbidity waters is investigated, which shows the robustness of the proposed scheme. Thanks to the great sensitivity (approaching the quantum limit) and a relatively larger effective area, benefits of misalignment tolerance contributed by the PMT is verified through a proof-of-concept LIWOC experiment.

  • 43.
    Oxenlowe, L. K.
    et al.
    Tech Univ Denmark, DTU Foton, DK-2800 Lyngby, Denmark..
    Jia, S.
    Tech Univ Denmark, DTU Foton, DK-2800 Lyngby, Denmark..
    Pang, X.
    Acreo Swedish ICT, NETLAB, SE-16425 Kista, Sweden..
    Ozolins, O.
    Acreo Swedish ICT, NETLAB, SE-16425 Kista, Sweden..
    Yu, X.
    Zhejiang Univ, Coll Informat Sci & EE, Hangzhou 310027, Peoples R China..
    Hu, H.
    Tech Univ Denmark, DTU Foton, DK-2800 Lyngby, Denmark..
    Guan, P.
    Tech Univ Denmark, DTU Foton, DK-2800 Lyngby, Denmark..
    Da Ros, F.
    Tech Univ Denmark, DTU Foton, DK-2800 Lyngby, Denmark..
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Jacobsen, G.
    Acreo Swedish ICT, NETLAB, SE-16425 Kista, Sweden..
    Galili, M.
    Tech Univ Denmark, DTU Foton, DK-2800 Lyngby, Denmark..
    Zibar, D.
    Tech Univ Denmark, DTU Foton, DK-2800 Lyngby, Denmark..
    Morioka, T.
    Tech Univ Denmark, DTU Foton, DK-2800 Lyngby, Denmark..
    100s Gigabit/s THz Communication2018In: 2018 conference on lasers and electro-optics (CLEO), IEEE , 2018Conference paper (Refereed)
    Abstract [en]

    This paper gives an overview of recent progress on the topic of using around 0.4 THz carriers for communications. Experimental demonstrations will be described, and concepts and pros&cons of various system-platfolins discussed.

  • 44.
    Oxenløwe, L. K.
    et al.
    Denmark.
    Jia, S.
    Denmark.
    Pang, X.
    Ozolins, O.
    Yu, X.
    China.
    Hu, H.
    Guan, P.
    Da Ros, F.
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Jacobsen, G.
    Galili, M.
    Denmark.
    Zibar, D.
    Denmark.
    Morioka, T.
    Denmark.
    100s gigabit/s THz communication2018In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2018Conference paper (Refereed)
    Abstract [en]

    This paper gives an overview of recent progress on the topic of using around 0.4 THz carriers for communications. Experimental demonstrations will be described, and concepts and pros & cons of various system-platforms discussed.

  • 45.
    Yong, Yean Shang
    et al.
    Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede, 7500 AE, Netherlands.
    Aravazhi, Shanmugan
    Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede, 7500 AE, Netherlands.
    Vázquez-Córdova, Sergio A.
    Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede, 7500 AE, Netherlands.
    García-Blanco, Sonia Maria
    Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede, 7500 AE, Netherlands.
    Pollnau, Markus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics. Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede, 7500 AE, Netherlands.
    1050 dB/cm gain in a 57.5at.% Yb-doped KGd(WO4)2 thin film at 981 nm2015In: Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015, Optical Society of America , 2015Conference paper (Refereed)
  • 46. Yong, Y. S.
    et al.
    Aravazhi, S.
    Vázquez-Córdova, S. A.
    García-Blanco, S. M.
    Pollnau, Markus
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    1050 dB/cm Gain in a 57.5at.% Yb-doped KGd(WO4)2 thin film at 981 nm2015In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2015Conference paper (Refereed)
  • 47.
    Ozolins, Oskars
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics. RISE Res Inst Sweden, S-16440 Kista, Sweden.;Riga Tech Univ, Inst Telecommun, LV-1048 Riga, Latvia..
    Ostrovskis, Armands
    Riga Tech Univ, Inst Telecommun, LV-1048 Riga, Latvia.;Riga Tech Univ, Commun Technol Res Ctr, LV-1048 Riga, Latvia..
    Salgals, Toms
    Riga Tech Univ, Inst Telecommun, LV-1048 Riga, Latvia.;Riga Tech Univ, Commun Technol Res Ctr, LV-1048 Riga, Latvia..
    Kruger, Benjamin
    Keysight Technol GmbH, Boblingen, Germany..
    Pittala, Fabio
    Keysight Technol GmbH, Boblingen, Germany..
    Joharifar, Mahdieh
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Schatz, Richard
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Che, Di
    Nokia Bell Labs, Murray Hill, 07974, NJ, United States.
    Matsui, Yasuhiro
    Coherent, Fremont, CA 94538 USA..
    Dippon, Thomas
    Keysight Technol GmbH, Boblingen, Germany..
    Fan, Yuchuan
    RISE Res Inst Sweden, S-16440 Kista, Sweden..
    Udalcovs, Aleksejs
    RISE Res Inst Sweden, S-16440 Kista, Sweden..
    Chacinski, Marek
    Coherent, Bruttovagen 7, S-17543 Jarfalla, Sweden..
    Westergren, Urban
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Zhang, Lu
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou, Peoples R China.;Zhejiang Lab, Hangzhou, Peoples R China..
    Mardoyan, Haik
    Bell Labs, Route Villejust, F-91620 Nozay, France..
    Yu, Xianbin
    Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou, Peoples R China.;Zhejiang Lab, Hangzhou, Peoples R China..
    Spolitis, Sandis
    Riga Tech Univ, Inst Telecommun, LV-1048 Riga, Latvia.;Riga Tech Univ, Commun Technol Res Ctr, LV-1048 Riga, Latvia..
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Gruen, Markus
    Keysight Technologies GmbH, Böblingen, Germany.
    Bobrovs, Vjaceslavs
    Riga Tech Univ, Inst Telecommun, LV-1048 Riga, Latvia..
    Louchet, Hadrien
    Keysight Technol GmbH, Boblingen, Germany..
    Pang, Xiaodan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics. RISE Res Inst Sweden, S-16440 Kista, Sweden.;Riga Tech Univ, Inst Telecommun, LV-1048 Riga, Latvia..
    106.25 Gbaud 4-Level Pulse Amplitude Modulation Links Supporting (2x)100Gigabit Ethernet on Single Lambda2023In: 2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC, 2023Conference paper (Refereed)
    Abstract [en]

    We experimentally demonstrate and compare EML- and DML-based optical interconnects with 106.25 Gbaud NRZ-OOK and PAM4 for computing applications. The results show that both transmitters can be used to enable optical -amplification-free transmissions with low-complexity DSP.

  • 48. Rademacher, G.
    et al.
    Puttnam, B. J.
    Luis, R. S.
    Sakaguchi, J.
    Klaus, W.
    Eriksson, Tobias A.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Awaji, Y.
    Hayashi, T.
    Nagashima, T.
    Nakanishi, T.
    Taru, T.
    Takahata, T.
    Kobayashi, T.
    Furukawa, H.
    Wada, N.
    10.66 Peta-Bit/s Transmission over a 38-Core-Three-Mode Fiber2020In: 2020 Optical Fiber Communications Conference and Exhibition, OFC 2020 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2020Conference paper (Refereed)
    Abstract [en]

    We demonstrate transmission of 368-WDM-38-core-3-mode × 24.5-GBaud 64- and 256-QAM signals over 13 km. Record data-rate and spectral-efficiency of 1158.7 b/s/Hz were enabled by a low DMD 38-core-3-mode fiber with high uniformity amongst cores.

  • 49. Rademacher, G.
    et al.
    Puttnam, B J
    Luís, R S
    Sakaguchi, J
    Klaus, W
    Eriksson, Tobias A.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Awaji, Y
    Hayashi, T
    Nagashima, T
    Nakanishi, T
    Taru, T
    Takahata, T
    Kobayashi, T
    Furukawa, H
    Wada, N
    10.66 peta-bit/s transmission over a 38-core-three-mode fiber2020In: Optical Fiber Communication Conference, OFC 2020, OSA - The Optical Society , 2020, Vol. Part F174-Conference paper (Refereed)
    Abstract [en]

    We demonstrate transmission of 368-WDM-38-core-3-mode x 24.5-GBaud 64- and 256-QAM signals over 13 km. Record data-rate and spectral-efficiency of 1158.7 b/s/Hz were enabled by a low DMD 38-core-3-mode fiber with high uniformity amongst cores. 

  • 50. Udalcovs, A
    et al.
    Jia, S
    Zhang, Lu
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Ozolins, Oskars
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Pang, Xiaodan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Kong, D
    Yu, X
    Xiao, S
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.
    Chen, Jiajia
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS.
    Morioka, T
    Hu, H
    Oxenløwe, L K
    107.1-Gbps net-rate transmission over a joint 51km-fibre-and-10.7m-wireless link for terahertz radio access networks2019In: 45th European Conference on Optical Communication, ECOC 2019, Institution of Engineering and Technology (IET) , 2019Conference paper (Refereed)
    Abstract [en]

    107.1 and 93.9-Gbps net-rate (gross-rate 133.9 and 101.3-Gbps) OFDM transmission on a 408-GHz carrier frequency is experimentally demonstrated over a joint fibre-wireless link, 51-km single-mode fibre and 10.7-m free-space, with bit-error-rates below the 20% soft- and 7% hard-decision FEC thresholds of 2.7×10-2 and 3.8×10-3, respectively.

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