IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
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Volume 2, Issue 18
Displaying 1-3 of 3 articles from this issue
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LETTER
  • Conductor loss reduction for liquid crystal millimeter-wave beam former
    Hirokazu Kamoda, Takao Kuki, Toshihiro Nomoto
    2005 Volume 2 Issue 18 Pages 471-476
    Published: 2005
    Released on J-STAGE: September 25, 2005
    DOIhttps://doi.org/10.1587/elex.2.471
    JOURNAL FREE ACCESS
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    Means of reducing the conductor loss of a liquid crystal millimeter-wave beam former were studied. The conductor loss is caused by surface currents flowing on electrodes of the beam former for applying control voltages to the liquid crystal layers. By making the electrode thickness comparable to or thinner than the skin depth, the surface currents that flow on both sides of the electrode in opposite directions cancel each other; consequently, the conductor loss can be reduced. Simulation results proved that doing so can effectively reduce the conductor loss.
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  • Experimental Investigation of pump propagating direction in double-pass Er3+-doped fiber amplifiers
    K. A. Khairi, F. R. M. Adikan, A. W. Naji, M. H. Al-Mansoori, M. A. Ma ...
    2005 Volume 2 Issue 18 Pages 477-481
    Published: 2005
    Released on J-STAGE: September 25, 2005
    DOIhttps://doi.org/10.1587/elex.2.477
    JOURNAL FREE ACCESS
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    In this paper, the impacts of pump propagating direction in double-pass Erbium-doped fiber amplifier are experimentally demonstrated. The double-pass optical amplifier architecture is constructed using a fiber loop mirror that consists of a circulator to reflect the amplified signal back into the Erbium-doped fiber. The gain and noise figure performance of the double-pass optical amplifier is not affected by the direction of pump light, forward- or backward-pumped scheme. The population inversion along the Erbium-doped fiber is locked to a specific fraction due to the double-pass amplification of the signal.
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  • A new active pixel structure with a pinned photodiode for wide dynamic range image sensors
    Jong-Ho Park, Shoji Kawahito, Yasuo Wakamori
    2005 Volume 2 Issue 18 Pages 482-487
    Published: 2005
    Released on J-STAGE: September 25, 2005
    DOIhttps://doi.org/10.1587/elex.2.482
    JOURNAL FREE ACCESS
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    A wide dynamic range CMOS image sensor based on a new active pixel structure with a pinned photodiode is proposed and evaluated with device simulations. The proposed pixel device has a linear and a logarithmic characteristics in low and high illumination region, respectively. The technique of direct detection of photodiode potential leads to a wide logarithmic response compared with the conventional linear-log wide DR image sensor with pinned photo diode.
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