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    Wyświetlanie 1-6 z 6
    Tytuł:
    Influence of a charge region on the operation of InGaAs/InAlAs/InP avalanche photodiodes
    Autorzy:
    Jurenczyk, J
    Zak, D
    Kaniewski, J
    Powiązania:
    https://bibliotekanauki.pl/articles/173910.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    avalanche photodiode
    device modeling
    InGaAs
    Opis:
    Avalanche photodiodes (APDs) operating at 1.55 μm wavelength are used in many different applications. Therefore, specialized devices with modified electrical characteristics are often strongly needed. In order to design and produce such structures, advanced modeling techniques and computer aided design (CAD) software are utilized. In the paper, modeling results of avalanche photodiodes with separated regions of absorption, grading, charge and multiplication (SAGCM) are presented. Simulations of diode structures were performed using APSYS software developed by Crosslight. Extensive calculations allowed for the detailed analysis of individual regions of the device and the determination of their influence on diode characteristics. Simulations showed a pronounced influence of the charge region on characteristics and performance of the device. Changes of the doping level of this layer exhibited strong modification in the band-to-band tunneling effect. Simultaneously it influenced the characteristics related to the Zener effect and carrier transport.
    Źródło:
    Optica Applicata; 2013, 43, 1; 39-46
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmitter Inclination Angle Characteristics for Underwater Optical Wireless Communication in a Variety of APD Detectors
    Autorzy:
    Mazin, Ali A. Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/1192197.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Communications
    Underwater Optical Communications
    Avalanche Photodiode
    Bit Error Rate
    Channel Capacity
    Opis:
    In this paper, the performance of an underwater optical wireless communications system is theoretically analyzed, using 4-PPM modulation technique and an avalanche photodiodes APD receiver over underwater environment channels. Based on the line of sight (LOS) geometrical model for optical beam propagation horizontally on an underwater medium and combined with signal to noise ratio model for Si, Ge and InGaAs APD and BER; then the impacts of the distance of transmission, power of the transmitter under Jerlov water types (I, IA, IB) are analyzed. The characteristics of bit error rate BER and channel capacity for 4-PPM optical modulation technique are studied under different APD detector and Jerlov water types. Simulation results indicate that the performance of PPM and Jerlov type (I) are more suited for an underwater optical wireless communication. On the other hand, we discuss the suitability of avalanche photodiodes under this modulation technique, where the photodiode Si APD has more advantage compared with the other detectors when used as a receiver in an underwater optical communication.
    Źródło:
    World Scientific News; 2016, 45, 2; 355-372
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detector diode circuit noise measurement and power supply method selection for the fiber optic seismograph
    Autorzy:
    Niespodziany, Sławomir
    Kurzych, Anna T.
    Dudek, Michal
    Powiązania:
    https://bibliotekanauki.pl/articles/1818211.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    fiber optic sensor
    fibre optic rotational seismograph
    closed loop
    detector diode
    avalanche photodiode
    noise
    spectral density
    Opis:
    This paper investigates the noise levels present at various points in the FOSREM type fiber optic seismograph. The main aim of this research was to discover magnitudes of noise, introduced by various components of the analog and optical circuits of the device. First, the noise present in the electronic circuit without any optics connected is measured. Further experiments show noise levels including the detector diode not illuminated and illuminated. Additional tests were carried out to prove the necessity of analog circuitry shielding. All measurements were repeated using three powering scenarios which investigated the influence of power supply selection on noise. The results show that the electronic components provide a sufficient margin for the use of an even more precise detector diode. The total noise density of the whole device is lower than 4⋅10⁻⁷ rad/(s√Hz). The use of a dedicated Insulating Power Converter as a power supply shows possible advantages, but further experiments should be conducted to provide explicit thermic confirmation of these gains.
    Źródło:
    Opto-Electronics Review; 2021, 29, 2; 71--79
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detector diode circuit noise measurement and power supply method selection for the fiber optic seismograph
    Autorzy:
    Niespodziany, S.
    Kurzych, A. T.
    Dudek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818216.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    fiber optic sensor
    fibre optic rotational seismograph
    closed loop
    detector diode
    avalanche photodiode
    noise
    spectral density
    Opis:
    This paper investigates the noise levels present at various points in the FOSREM type fiber optic seismograph. The main aim of this research was to discover magnitudes of noise, introduced by various components of the analog and optical circuits of the device. First, the noise present in the electronic circuit without any optics connected is measured. Further experiments show noise levels including the detector diode not illuminated and illuminated. Additional tests were carried out to prove the necessity of analog circuitry shielding. All measurements were repeated using three powering scenarios which investigated the influence of power supply selection on noise. The results show that the electronic components provide a sufficient margin for the use of an even more precise detector diode. The total noise density of the whole device is lower than 4⋅10⁻⁷ rad/(s√Hz). The use of a dedicated Insulating Power Converter as a power supply shows possible advantages, but further experiments should be conducted to provide explicit thermic confirmation of these gains.
    Źródło:
    Opto-Electronics Review; 2021, 29, 2; 71--79
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detector diode circuit noise measurement and power supply method selection for the fiber optic seismograph
    Autorzy:
    Niespodziany, S.
    Kurzych, A. T.
    Dudek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818219.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    fiber optic sensor
    fibre optic rotational seismograph
    closed loop
    detector diode
    avalanche photodiode
    noise
    spectral density
    Opis:
    This paper investigates the noise levels present at various points in the FOSREM type fiber optic seismograph. The main aim of this research was to discover magnitudes of noise, introduced by various components of the analog and optical circuits of the device. First, the noise present in the electronic circuit without any optics connected is measured. Further experiments show noise levels including the detector diode not illuminated and illuminated. Additional tests were carried out to prove the necessity of analog circuitry shielding. All measurements were repeated using three powering scenarios which investigated the influence of power supply selection on noise. The results show that the electronic components provide a sufficient margin for the use of an even more precise detector diode. The total noise density of the whole device is lower than 4⋅10⁻⁷ rad/(s√Hz). The use of a dedicated Insulating Power Converter as a power supply shows possible advantages, but further experiments should be conducted to provide explicit thermic confirmation of these gains.
    Źródło:
    Opto-Electronics Review; 2021, 29, 2; 71--79
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The calculation of received optical power during airborne laser scanning of water object
    Autorzy:
    Babushka, A.
    Burshtynska, K.
    Babiy, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/100274.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
    Tematy:
    specular reflection
    water surface
    avalanche photodiode
    signal-to-noise ratio
    ranging
    ranging standard deviation
    odbicie lustrzane
    powierzchnia wody
    stosunek sygnału do szumu
    zasięg
    Opis:
    In this paper calculation of some physical parameters of the receiver of laser scanning system is presented. Basic physical principles of laser scanning of water objects are considered. Ranging standard deviation for typical parameters of laser scanning system are calculated. Formula for calculation of reflected optical power for specular reflective objects is proposed.
    Źródło:
    Geomatics, Landmanagement and Landscape; 2014, 3; 7-15
    2300-1496
    Pojawia się w:
    Geomatics, Landmanagement and Landscape
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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