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Sökning: swepub > Larsson Anders > Larsson Anders 1957

  • Resultat 231-240 av 348
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231.
  • Modh, Peter, 1968, et al. (författare)
  • Linear Cascade VCSEL Arrays With High Differential Efficiency and Low Differential Resistance
  • 2006
  • Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 18:1, s. 100-102
  • Tidskriftsartikel (refereegranskat)abstract
    • We have fabricated monolithic linear cascade ver- tical-cavity surface-emitting laser (VCSEL) arrays intended for low loss fiber-optic radio-frequency links. Arrays with up to four VCSELs connected in series, with a spacing of 250 m, were fab- ricated on an insulating substrate. A thick layer of BCB was used to facilitate series connection through contact metallization and enable high frequency operation. The threshold current is 0.6 mA, independent of the number of VCSELs in the array. Differential efficiency, maximum output power, voltage, and differential re- sistance scale linearly with the number of VCSELs. For a four VCSEL array, we achieve a high differential efficiency of 160%, a maximum output power of 24 mW, and a low differential resis- tance of 220 . Basic link measurements, using a series connected VCSEL array, a parallel fiber ribbon, and a parallel connected detector array revealed a differential current gain exceeding unity in the low frequency limit.
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232.
  • Ou, Yiyu, et al. (författare)
  • Impedance characteristics and parasitic speed limitations of high speed 850 nm VCSELs
  • 2009
  • Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 21, s. 1840-
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract—The impedance characteristics of high-speed oxideconfined 850-nm vertical-cavity surface-emitting lasers have been studied with the aim of identifying the importance of device parasitics for the modulation bandwidth. Through equivalent circuit modeling, it is confirmed that device parasitics have a major impact on the bandwidth and the importance of each individual circuit element has been investigated. According to the extrapolation of the parameters derived from S11 measurements below 20 GHz towards higher frequencies and assuming that the mesa capacitance can be reduced by adding a few extra oxide layers without significantly affecting series resistance, our model predicts that the 3-dB parasitic frequency can be increased from 22 to above 30 GHz. Accounting also for bandwidth limitations due to thermal effects, we expect an increase of the modulation bandwidth of several gigahertz which may enable direct current modulation at 40 Gb/s.
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233.
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234.
  • Roelkens, Gunther, et al. (författare)
  • 850 nm hybrid vertical cavity laser integration for on-chip silicon photonics light sources
  • 2017
  • Ingår i: Optical Fiber Communication Conference (OFC), 19-23 March 2017. - 9781943580231 ; , s. W3E.6-
  • Konferensbidrag (refereegranskat)abstract
    • The realization of 850 nm hybrid III-V/dielectric VCSELs is reported in order to realize low power consumption integrated light sources for SiN waveguide circuits, which find applications both in short-reach optical communication and optical sensors.
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235.
  • Safaisini, Rashid, 1981, et al. (författare)
  • 20 Gbit/s data transmission over 2 km multimode fibre using 850 nm mode filter VCSEL
  • 2014
  • Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 50:1, s. 40-42
  • Tidskriftsartikel (refereegranskat)abstract
    • Error-free data transmission over 1.3 and 2 km multimode fibre at 25 and 20 Gbit/s, respectively, is demonstrated using a high-speed, single-mode, 850 nm vertical-cavity surface-emitting laser (VCSEL) with an integrated mode filter. This result represents a bitrate-distance product of 40 Gbit/s km, a new record for multimode fibre VCSELbased interconnects.
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236.
  • Safaisini, Rashid, 1981, et al. (författare)
  • 20 Gbit/s error-free operation of 850 nm oxide-confined VCSELs beyond 1 km of multimode fibre
  • 2012
  • Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 48:19, s. 1225-U81
  • Tidskriftsartikel (refereegranskat)abstract
    • Error-free transmission over 1.1 km of OM4 multimode fibre is demonstrated at 20 Gbit/s bit rate using a narrow spectral width, high-speed 850 nm vertical-cavity surface-emitting laser.
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237.
  • Safaisini, Rashid, 1981, et al. (författare)
  • 22 Gb/s error-free data transmission beyond 1 km of multi-mode fiber using 850 nm VCSELs
  • 2013
  • Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 9780819494085 ; 8639
  • Konferensbidrag (refereegranskat)abstract
    • The first error-free data transmission beyond 1 km of multi-mode fiber at bit-rates exceeding 20 Gb/s is demonstrated using a high modulation bandwidth, quasi-single mode (SMSR similar to 20 dB) 850 nm VCSEL. A VCSEL with small similar to 3 mu m aperture shows quasi-single mode operation with a narrow spectral width. The top mirror reflectivity of the VCSEL is optimized for high speed and high output power by shallow etching. A combination of narrow spectral width and high optical power reduces the effects of fiber dispersion and fiber and connector losses and enables such a long transmission distance at high bit-rates.
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238.
  • Safaisini, Rashid, 1981, et al. (författare)
  • High-Speed 850 nm Quasi-Single Mode VCSELs for Extended Reach Optical Interconnects
  • 2013
  • Ingår i: Journal of Optical Communications and Networking. - 1943-0620 .- 1943-0639. ; 5:7, s. 686-695
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents recent results on high-speed, quasi-single-mode, 850 nm vertical-cavity surface-emitting lasers (VCSELs) with a narrow spectral width for extended-reach optical interconnects. The top mirror reflectivity is adjusted for high output power, slope efficiency, and small signal modulation bandwidth. An oxide confined VCSEL with an ∼3  μm aperture diameter delivers 2 mW of output power and reaches a resonance frequency as high as 25 GHz and a modulation bandwidth exceeding 20 GHz. A small K-factor of 0.17 ns and a large D-factor of 17.3  GHz/mA1/2, extracted from the VCSEL modulation response, along with the improved DC and modal properties enable energy-efficient data transmission at high bit rates over long-distance multimode fiber. Error-free transmission at bit rates exceeding 20  Gbits/s over 1.1 km of OM4 fiber is demonstrated and shown to be limited mainly by the photoreceiver bandwidth. A theoretical investigation of the dependence of link performance on photoreceiver bandwidth is also presented.
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239.
  • Shao, J, et al. (författare)
  • Evolution of Valence-Band Alignment with Nitrogen Content in GaNAs/GaAs Single Quantum Wells
  • 2008
  • Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 93:3, s. Art. Nr. 031904-
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on experimental evidence for the transition of valence-band alignment from type I to type II in Ga Nx As1-x GaAs single quantum wells by photoreflectance measurements. The substitutional nitrogen content covers a range of 1.4%-5.9%. The turning point of the type I-type II transition occurs at x4.7%. The experimental observations can be well interpreted by a combination of band anticrossing model and model-solid theory when nonlinear behavior of either the shear deformation potential or the average valence-band energy is taken into account. The effect of dilute nitrogen on the valence-band offset of GaNAsGaAs quantum well structure is hence clarified. © 2008 American Institute of Physics.
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240.
  • Simpanen, Ewa, 1987, et al. (författare)
  • 1060 nm single and multimode VCSELs for up to 50 Gb/s modulation
  • 2017
  • Ingår i: Proceedings of IEEE Photonics Conference 2017. - : IEEE. - 9781509065776 ; , s. 65-66
  • Konferensbidrag (refereegranskat)abstract
    • We present the design and performance of 1060 nm VCSELs with up to 50 Gb/s intrinsic speed and demonstrate 25 Gb/s transmission over 1000 m of 1060 nm optimized MMF using a single-mode VCSEL and mode-selective launch.
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  • Resultat 231-240 av 348
Typ av publikation
konferensbidrag (180)
tidskriftsartikel (164)
bokkapitel (2)
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patent (1)
Typ av innehåll
refereegranskat (304)
övrigt vetenskapligt/konstnärligt (44)
Författare/redaktör
Gustavsson, Johan, 1 ... (199)
Westbergh, Petter, 1 ... (116)
Wang, Shu Min, 1963 (85)
Haglund, Åsa, 1976 (83)
Sadeghi, Mahdad, 196 ... (74)
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Haglund, Erik, 1985 (62)
Bengtsson, Jörgen, 1 ... (49)
Haglund, Emanuel, 19 ... (37)
Wei, Yongqiang, 1975 (34)
Andrekson, Peter, 19 ... (34)
Szczerba, Krzysztof, ... (34)
Karlsson, Magnus, 19 ... (32)
Kögel, Benjamin, 197 ... (31)
Roelkens, Gunther (24)
Baets, Roel G. (23)
Adolfsson, Göran, 19 ... (22)
Modh, Peter, 1968 (22)
Lengyel, Tamas, 1986 (20)
Kumari, Sulakshna (20)
Zhao, Qing Xiang, 19 ... (19)
Safaisini, Rashid, 1 ... (18)
Larkins, Eric (17)
Simpanen, Ewa, 1987 (16)
Melanen, P. (15)
Sorin, W. V. (15)
Zhao Ternehäll, Huan ... (14)
Grabowski, Alexander ... (14)
Uusimaa, Peteri (13)
Lim, Jun (12)
Joel, A. (12)
Sujecki, S. (12)
Söderberg, Emma, 198 ... (12)
Mackenzie, R (11)
Stattin, Martin, 198 ... (10)
Debernardi, P. (10)
Lai, Zonghe, 1948 (9)
Sipilä, Pekko (9)
Amann, M. C. (9)
Mathai, S (9)
Torres Company, Vict ... (8)
Bull, S (8)
Goyvaerts, J. (8)
Agrell, Erik, 1965 (7)
Borgentun, Carl, 197 ... (7)
Song, Yuxin, 1981 (7)
Tan, M. R. (7)
Strassner, Martin (7)
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Ralph, Stephen E. (7)
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