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Träfflista för sökning "WFRF:(Bengtsson Jörgen 1968 ) "

Sökning: WFRF:(Bengtsson Jörgen 1968 )

  • Resultat 41-50 av 114
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41.
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42.
  • Engström, David, 1976, et al. (författare)
  • Rapid SLM Design for Grid-Free Multispot Positioning in 2D and 3D with a Modified Gerchberg-Saxton Algorithm
  • 2009
  • Ingår i: Digital Holography and Three-Dimensional Imaging, OSA Technical Digest (CD). - Washington, D.C. : OSA. - 2162-2701. - 9781557528711 ; , s. DWB13-
  • Konferensbidrag (refereegranskat)abstract
    • A single-plane FFT-based algorithm which optimizes a defocused field corresponding to a desired spatial configuration of focused spots is presented. The defocused target field allows for grid-free spot positioning in 2D and 3D.
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43.
  • Engström, David, 1976, et al. (författare)
  • Steering accuracy of a spatial light modulator-based single beam steerer: guidelines and limitations
  • 2008
  • Ingår i: SPIE Proceedings. - : SPIE. - 0277-786X .- 1996-756X. - 9780819472588
  • Konferensbidrag (refereegranskat)abstract
    • The positioning accuracy when a phase-only one dimensional spatial light modulator (SLM) is used for beam steering is limited by the number of pixels and their quantized phase modulation. Optimizing the setting of the SLM pixels individually can lead to the inaccuracy being a significant fraction of the diffraction limited spot size. This anomalous behaviour was simulated numerically, and experiments showed the same phenomena with very good agreement. However, by including an extra degree of freedom in the optimization of the SLM setting, we show that the accuracy can be improved by a factor proportional to the number of pixels in the SLM.
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44.
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45.
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46.
  • Gustavsson, Johan, 1974, et al. (författare)
  • High speed 850nm VCSELs for >40Gb/s transmission
  • 2013
  • Ingår i: 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2013. - 9781479904570 ; , s. OTh4H.4-
  • Konferensbidrag (refereegranskat)abstract
    • VCSELs capable of direct modulation exceeding 40Gb/s are needed in next generation optical interconnect standards. Using a refined high-speed design we demonstrate GaAs-based VCSELs having record-high 28GHz modulation bandwidth, and that operate error-free at 47Gb/s.
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47.
  • Gustavsson, Johan, 1974, et al. (författare)
  • High-speed, high-temperature VCSELs for optical interconnects
  • 2013
  • Ingår i: 2013 IEEE Photonics Society Summer Topical Meeting Series, PSSTMS 2013. - 9781467350600 ; , s. 7-8
  • Konferensbidrag (refereegranskat)abstract
    • Directly modulated VCSELs operating at 40Gb/s are required for next generation optical interconnect standards. Using a refined high-speed design we demonstrate GaAs-based VCSELs that operate error-free at 47Gb/s at 25°C, and 40Gb/s at 85°C.
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48.
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49.
  • Gustavsson, Johan, 1974, et al. (författare)
  • Silicon integrated 850-nm hybrid vertical-cavity laser for life science applications
  • 2017
  • Ingår i: VCSEL Day 2017.
  • Konferensbidrag (refereegranskat)abstract
    • The integration of efficient laser sources on silicon would enable fully integrated silicon photonic circuits with a high degree of functionality and performance complexity for many applications [1]. Different integration concepts have therefore been suggested, where one such technique is the heterogeneous integration of a vertical-cavity laser (VCL), referred to as a hybrid VCL. It is promising as it has potential to offer low drive currents, high modulation bandwidths, and small footprint [2-4]. In-plane emission with waveguide-coupling can be achieved by an intra-cavity waveguide embossed with a weak diffraction grating, as an example [5]. Integration of such short-wavelength laser sources on a silicon-nitride (SiN) waveguide platform on silicon may enable fully integrated silicon photonic circuits for applications not only in short-reach optical interconnects but also in life science and bio-photonics. As a first step in realizing short-wavelength hybrid VCLs with in-plane emission coupled to a SiN waveguide, we have developed a technique to produce high performance 850-nm hybrid VCLs with out-of-plane emission. It is based on adhesive bonding of epitaxial AlGaAs-material onto a dielectric distributed Bragg reflector (DBR) on silicon [6-8]. We have fabricated devices with surface emission having sub-mA threshold current, >2 mW output power, and 25 Gbit/s modulation speed [8]. To be able to demonstrate in-plane emission with SiN waveguide coupling from our hybrid 850-nm VCLs, our next step is to add a SiN waveguide structure with embossed grating on top of the dielectric DBR, before adhesively bonding the AlGaAs-material. So far, based on numerical simulations, we have designed a device that is predicted to yield a slope efficiency of ~0.3 W/A at 25 °C for the light coupled to a single-mode waveguide, while maintaining a sub-mA threshold current for the lasing [9]. This work is supported by the European Union’s Horizon 2020 research and innovation program under grant agreement no. 688519 (PIX4life), the Swedish Foundation for Strategic Research (SSF), and the European FP7-ERC-InSpectra Advanced Grant. References [1]  Z. Zhou et al., Light Sci. Appl., vol. 4, no. 11, p. e358, 2015. [2]  Y. Tsunemi et al., Opt. Express, vol. 21, no. 23, p. 28685, 2013. [3]  J. Ferrara et al., Opt. Express, vol. 23, no. 3, p. 2512, 2015. [4]  G.C. Park et al., Laser Photon. Rev., vol. 9, no. 3, p. L11, 2015. [5]  D. A. Louderback et al., Electron. Lett., vol. 40, no. 17, p. 1064, 2004. [6]  E.P. Haglund et al., Opt. Express, vol. 23, no. 26, p. 33634, 2015. [7]  E.P. Haglund et al., IEEE Photon. Technol. Lett., vol. 28, no. 8, p. 856, 2016. [8]  E.P. Haglund et al., IEEE J. Sel. Top. Quantum Electron., vol. 23, no. 6, p. 1700109, 2017. [9]  S. Kumari et al., Submitted to IEEE Photon. J.,2017.
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50.
  • Gustavsson, Johan, 1974, et al. (författare)
  • Silicon-Integrated Hybrid-Vertical-Cavity Lasers for Life Science Applications
  • 2017
  • Ingår i: 2017 IEEE Photonics Conference. - 9781509065783
  • Konferensbidrag (refereegranskat)abstract
    • Hybrid 850-nm-wavelength vertical-cavity lasers formed by adhesively bonding AlGaAs-material to a dielectric distributed Bragg reflector on Silicon has experimentally enabled sub-mA threshold current and 25 Gb/s modulation speed. Numerical calculations estimate >0.3 mW/mA slope efficiency for in-plane SiN waveguide coupled light using an intra-cavity grating.
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  • Resultat 41-50 av 114
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tidskriftsartikel (55)
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övrigt vetenskapligt/konstnärligt (20)
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Bengtsson, Jörgen, 1 ... (108)
Gustavsson, Johan, 1 ... (50)
Larsson, Anders, 195 ... (49)
Haglund, Åsa, 1976 (42)
Hashemi, Seyed Ehsan ... (17)
Engström, David, 197 ... (15)
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Haglund, Erik, 1985 (15)
Enoksson, Peter, 195 ... (12)
Hedsten, Karin, 1964 (12)
Goksör, Mattias, 197 ... (10)
Hjort, Filip, 1991 (10)
Stattin, Martin, 198 ... (9)
Westbergh, Petter, 1 ... (9)
Adolfsson, Göran, 19 ... (7)
Melin, Jonas (7)
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Borgentun, Carl, 197 ... (7)
Nikolajeff, Fredrik (6)
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Wang, Shu Min, 1963 (5)
Sadeghi, Mahdad, 196 ... (5)
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Persson, Martin, 197 ... (5)
Galt, Sheila, 1956 (5)
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Olsson, Jörgen (4)
D'Havé, Koen, 1972 (4)
Rudquist, Per, 1968 (4)
Lim, Jun (4)
Bengtsson, Stefan, 1 ... (4)
Rydberg, Christer, 1 ... (4)
Rödjegård, Henrik, 1 ... (4)
Kumari, Sulakshna (4)
Baets, Roel G. (4)
Roelkens, Gunther (4)
Grandjean, Nicolas (4)
Debernardi, P. (4)
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CARLSSON, STEFAN, 19 ... (3)
Vilokkinen, Ville (3)
Gustafsson, Anders (3)
Andrekson, Peter, 19 ... (3)
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Löfving, Björn, 1970 (3)
Rossbach, Georg (3)
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