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    Wyświetlanie 1-4 z 4
    Tytuł:
    An Overview of Free Space Optics with Quantum Cascade Lasers
    Autorzy:
    Mikołajczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/226628.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    quantum cascade laser
    free space optics
    laser communications
    Opis:
    The article presents an overview of the work on quantum cascade lasers application in free space optical systems (Free Space Optics - FSO). There are discussed the main issues of the open-space laser communications and their practical construction. Comparative analyses of each FSO technology were performed. Brief description of quantum cascade (QC) lasers and some developments related to the use of these lasers in optical data link are also presented. In summary, the constructed models of FSO links with QC lasers are characterized.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 3; 259-264
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Wireless Communications Operated at Long-Wave Infrared Radiation
    Autorzy:
    Mikolajczyk, Janusz
    Szabra, Dariusz
    Prokopiuk, Artur
    Achtenberg, Krzysztof
    Wojtas, Jacek
    Bielecki, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/226104.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical wireless communication
    free space optics
    quantum cascade lasers
    optoelectronics
    telecommunications
    Opis:
    This paper presents some construction analysis and test results of a Free Space Optics system operating at the wavelength of 9.35 μm. In the system, a quantum cascade laser and a photoreceiver with mercury cadmium telluride photodetectors were used. The main parameters of these elements were discussed taking into account a data link operation. It also provides to determine a data range for various weather conditions related to scattering and scintillation. The results of numerical analyses defined the properties of currently available FSO technologies working in the near infrared or in the short infrared range of spectrum versus the performances of the developed system. The operation of this system was verified in three different test environments. The obtained results may also contain important issues related to the practical application of any FSO system.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 2; 383-387
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative BER Analysis of Free Space Optical System Using Wavelength Diversity over Exponentiated Weibull Channel
    Autorzy:
    Shah, Dhaval
    Joshi, Hardik
    Kothari, Dilipkumar
    Powiązania:
    https://bibliotekanauki.pl/articles/2055211.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bit error rate
    exponentiated weibull distribution
    free space optics
    FSO
    wavelingth diversity
    optimal combining
    Opis:
    Atmospheric turbulence is considered as major threat to Free Space Optical (FSO) communication as it causes irradiance and phase fluctuations of the transmitted signal which degrade the performance of FSO system. Wavelength diversity is one of the techniques to mitigate these effects. In this paper, the wavelength diversity technique is applied to FSO system to improve the performance under different turbulence conditions which are modeled using Exponentiated Weibull (EW) channel. In this technique, the data was communicated through 1.55 µm, 1.31 µm, and 0.85 µm carrier wavelengths. Optimal Combining (OC) scheme has been considered to receive the signals at receiver. Mathematical equation for average BER is derived for wavelength diversity based FSO system. Results are obtained for the different link length under different turbulence conditions. The obtained average BER results for different turbulence conditions characterized by EW channel is compared with the published result of average BER for different turbulence which is presented by classical channel model. A comparative BER analysis shows that maximum advantage of wavelength diversity technique is obtained when different turbulence conditions are modeled by EW channel.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 665--672
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Finite-Sized Aperture on the Performance of Differential Multihop DF-FSO Network
    Autorzy:
    Agarwal, Deepti
    Yadav, Poonam
    Powiązania:
    https://bibliotekanauki.pl/articles/2200711.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    differencial modulation
    K-distribution
    Free space optics (FSO)
    Average bit error rate (BER)
    Decode and forward relaying
    pointing error
    Opis:
    This paper investigates the differential binary modulation for decode-and-forward (DF) based relay-assisted free space optical (FSO) network under the effect of strong atmospheric turbulence together with misalignment error (ME). The atmospheric fading links experience K-distributed turbulence. First we derive novel closed form expression for average bit error rate (BER) and outage probability (OP) in terms of Meijer’s G function. Further, the OP of differential DF-FSO system with multiple relays is derived. We also analyze the asymptotic performance for the sake of getting the order of diversity and the coding gain. The power allotment term is utilized to examine the effect of different power allotment techniques on BER and OP. The simulation results have been used to validate the derived analytical results.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 807--813
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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