| 11. |
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| 12. |
- Bergkvist, Magnus, et al.
(författare)
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TM-AFM Threshold Analysis of Macromolecular Orientation : A Study of the Orientation of IgG and IgE on Mica Surfaces
- 1998
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Ingår i: Journal of Colloid and Interface Science. - : Elsevier BV. - 0021-9797 .- 1095-7103. ; 206:2, s. 475-481
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Tidskriftsartikel (refereegranskat)abstract
- Adsorption and orientation properties of two different types of immunoglobulin molecules on derivatized and native mica surfaces were investigated using TM-AFM. The analyses included height measurements at two different pH values and a new technique, presented here as threshold analysis, which displays the outer mantle shape of an adsorbed protein. A major difference in preferential orientation is observed upon comparing the adsorption of the two proteins onto the different surfaces. The characteristics of both the adsorbed immunoglobulin and the surface are important for any preferential orientation of the adsorbed protein.
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| 13. |
- Boyer, Gilbert, et al.
(författare)
-
Four-wave mixing of femtosecond pump-probe pulses in optical fibers
- 1999
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Ingår i: Nonlinear Guided Waves and Their Applications.
-
Konferensbidrag (refereegranskat)abstract
- The nonlinear propagation of a pump-probe pulse pair in an optical fiber has been extensively studied both experimentally, numerically and theoretically. In particular, it has been shown that the probe can attain a spectral shift under the influence of cross-phase modulation (XPM) from the pump, an effect having important applications in e. g. optical switching and demultiplexing.
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| 14. |
- Brentel, Jonas, et al.
(författare)
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Single-wavelength 40 Gb/s soliton field transmission experiments over 400 km fibre without in-line control
- 1999
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Ingår i: OFC/IOOC 1999 - Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication. - 155752582X ; 3, s. 121-124
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Konferensbidrag (refereegranskat)abstract
- We report single-wavelength 40-Gbit/s soliton transmission over 400-km installed fiber lines in Sweden. Both polarization-division multiplexed and parallel solitons were transmitted. The system performance is dominated by the polarization-mode dispersion.
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| 15. |
- Dordlofva, Bengt, et al.
(författare)
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Arrangement for Frequency Planning in Cellular Systems
- 1999
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Patent (populärvet., debatt m.m.)abstract
- The invention relates to an arrangement for frequency planning in cellular systems using a mix of wide and narrow antenna beams. The arrangement employs a dual frequency reuse for the respective wide and narrow antenna beams. According to the invention, a first frequency group is allocated to a cluster with a reuse distance sufficient for narrow beam channels and a second frequency group is allocated to a larger cluster with a reuse distance sufficent for wide beam channels. The second frequency group is a subdivision of and contained in the first frequency group. The second frequency group is the only frequency group available for wide beam channels, while all the frequencies of the two groups are available for the narrow beams channels. Generally, the wide beams are used for control channels and the narrow beams are used for traffic channels. A frequency planning in accordance with the invention makes it possible to use narrow beam traffic channels more efficiently compared to known state of the art methods which results in improved trunking efficiency.
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| 16. |
- Hedekvist, Per Olof E, 1967, et al.
(författare)
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Fiber four-wave mixing demultiplexing with inherent parametric amplification
- 1997
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Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 15:11, s. 2051-2058
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Tidskriftsartikel (refereegranskat)abstract
- We present an all-optical time-division demultiplexer with 22 dB conversion efficiency, using four-wave mixing (FWM) at 1550 nm in a single-mode dispersion-shifted fiber. Error-free demultiplexing of 20 Gb/s data to 10 Gb/s is obtained, with 1.4 dB power penalty at BER = 10-9. We also derive theoretical expressions for the conversion efficiency, the maximum bit rate that is possible to demux and the shape of the switching window. In particular we emphasize the importance of phase-matching in order to achieve a flat switching window. Furthermore the pump must remain undepleted to avoid a detrimental reduction of the extinction ratio due to instantaneous parametric gain saturation.
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| 17. |
- Hedekvist, Per Olof E, 1967, et al.
(författare)
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Polarization dependence and efficiency in a fiber four-wave mixing phase conjugator with orthogonal pump waves
- 1996
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Ingår i: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 8:6, s. 776-778
-
Tidskriftsartikel (refereegranskat)abstract
- We study the influence of pump separation on polarization dependence and on conversion efficiency in a fiberbased optical phase-conjugator with two orthogonal pump waves at different wavelengths. The polarization dependence is found to be minimized when the pump wavelength separation is small. Furthermore, both theory and experiments show that the efficiency is maximized if the signal wavelength is located close to one of the pumps.
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| 18. |
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| 19. |
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| 20. |
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