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    Tytuł:
    Polarization dependence of stimulated Brillouin scattering-based switchable microwave photonic filter
    Autorzy:
    Gu, Jun
    Wang, Fei
    Lu, Youxi
    Peng, Mengmeng
    Shi, Lun
    Kang, Wen
    Huang, Jingxin
    Powiązania:
    https://bibliotekanauki.pl/articles/173837.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    microwave photonic filter
    stimulated Brillouin scattering
    polarization dependence
    Opis:
    We propose and experimentally demonstrate a switchable microwave photonic filter based on polarization dependence of stimulated Brillouin scattering (SBS). The continuous optical wave from a tunable laser source is split into two branches. One branch serves as the SBS pump source and another branch serves as the signal source which are interactional to generate the SBS effect in the dispersion-shifted fiber. Only by adjusting the polarization direction of pump light and signal light, a frequency response switched between bandpass and notch filtering shape can be obtained.
    Źródło:
    Optica Applicata; 2019, 49, 1; 5-11
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of a tunable and switchable multi-wavelength bidirectional Brillouin-erbium fiber ring laser
    Autorzy:
    Wang, F.
    Yuan, R. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2033954.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Rayleigh scattering
    stimulated Brillouin scattering
    four-wave mixing
    laser
    laser optics
    Opis:
    A multi-wavelength bidirectional Brillouin-erbium fiber ring laser with switchable Brillouin frequency spacing (BFS) is proposed and experimentally demonstrated. In the presented Brillouin-erbium ring laser, including an optical amplifier and a highly nonlinear fiber, and without any optical isolator, due to Rayleigh scattering, stimulated Brillouin scattering, and cascaded four-wave mixing initiated successively by the Brillouin pump (BP) light, the odd- and even-order Stokes lines are generated and circulate in the opposite direction in the ring cavity. The BP light and Stokes-induced Rayleigh backscattering light also simultaneously circulate in the ring cavity. Only by adjusting BP power, the gain competition between Brillouin based Stokes and cavity modes’ oscillation can be controlled, the laser output can be conveniently switched between single BFS and odd- or even-order double BFS. In addition, under the certain BP power conditions, the proposed multi-wavelength Brillouin-erbium fiber laser also can realize switchable odd- or even-order Stokes generation and Stokes generation with single BFS, with an increasing wavelength number in turn, only by simply adjusting pump power of the erbium-doped fiber amplifier. Stability and wavelength tunability of the proposed multi-wavelength bidirectional Brillouin-erbium fiber ring laser are also investigated, respectively.
    Źródło:
    Optica Applicata; 2021, 51, 3; 375-389
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light scattering by horizontally oriented square pyramid in the Wentzel–Kramers–Brillouin approximation
    Autorzy:
    Tari, El Mostafa
    Bahaoui, Abdelhadi
    Lamsoudi, Redouane
    Khouilid, Mohammed
    Ibnchaikh, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/2086759.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    form factor
    light scattering
    pyramidal ice crystal
    Wentzel-Kramers-Brillouin approximation
    Opis:
    In this research, we studied the sensitivity of the form factor of a pyramidal ice crystal in the Wentzel–Kramers–Brillouin (WKB) approximation to its geometrical characteristics: the shape, spatial orientation, aspect ratio and size parameter. Using the WKB method, we derive an analytical formula of the form factor of horizontally oriented square pyramid. We will begin this work by applying the WKB approximation to the case of a particle which rotates about its main axis. Then, we will move to deal with the case of a particle which rotates about an axis perpendicular to its main axis in a future work. In addition, the coefficient of extinction is also given. To illustrate our analytical results, some numerical examples are analyzed.
    Źródło:
    Optica Applicata; 2022, 52, 2; 213--228
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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