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    Wyświetlanie 1-5 z 5
    Tytuł:
    A polarization filter at 1550 nm based on photonic crystal fiber with symmetry around gold-coated holes
    Autorzy:
    Zha, F.
    Li, J.
    Sun, P.
    Wang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/173897.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photonic crystal fiber
    polarization filter
    finite element method
    surface plasmon resonance
    Opis:
    A polarization photonic crystal fiber based on surface plasmon resonance is proposed in this paper. The photonic crystal fiber with gold coated holes is studied through using the finite element method. The impacts of structural parameters on the resonance characteristics are discussed. Numerical simulations show that the resonance wavelength can be modulated by changing the parameters of the air holes and thickness of gold layer. At the resonance wavelength 1550 nm, the loss is 3.8045 dB/m in x-polarization and the loss is 28464 dB/m in y-polarization by adjusting the size of the gold-coated holes and the place of air holes. Results show that the loss of y-polarized mode is much larger than the loss of x-polarized mode. The y-polarized mode is suppressed, and only x-polarized mode can be guided at the resonance wavelength of y-polarized mode. The results indicate that the mode polarized in one direction can be filtered out selectively by adjusting the diameter of air holes, and the filtering effect in a communication band is achieved.
    Źródło:
    Optica Applicata; 2018, 48, 4; 609-620
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of the symmetrical deformation y = xk + 1 on the optimization of the symmetrical multiple channeled white light color filter
    Autorzy:
    Baraket, Z.
    Zaghdoudi, J.
    Kanzari, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/173545.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photonic crystals
    symmetry
    filter
    polarization
    optimization
    Opis:
    In this paper, we consider a hybrid photonic crystal symmetrically deformed (Bg5/Cu3/Bg5) consisting of the third generation of the copper mean sequence (Cu3), sandwiched between two Bragg mirrors at the fifth generation (Bg5). Our system realizes a polychromatic filter that transmits five wavelengths in the visible spectrum independently of the polarization of the light transverse electric or transverse magnetic. Secondly, the photonic crystal (Bg5/Cu3/Bg5) undergoes the deformation y = xk + 1 (where k is the degree of deformation, x and y are respectively the coordinates of the system before and after the deformation). With a proper choice of the degree of deformation k, this photonic crystal maintains its property of polychromatic filter whose transmission wavelength is independent of the polarization’s state. Thanks to this deformation, we can disperse the optical windows in different spectra of visible light and exactly in the violet, blue, green, and orange light. This system can be used in the fabrication of color filter devices and the white light emitting diodes.
    Źródło:
    Optica Applicata; 2017, 47, 1; 19-28
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Demokratyczna debata w mediach społecznościowych – utopijne nadzieje I smutna rzeczywistość
    Autorzy:
    Miotk, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2050370.pdf
    Data publikacji:
    2020-12-30
    Wydawca:
    Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
    Tematy:
    social media
    filtering algorithms
    echo chamber
    filter bubble
    algorithms
    political polarization
    Opis:
    The text analyzes social media in terms of the possibility of conducting a democratic debate through them. Initially, their users had great hopes to do so. Social media were to be not only a tool for expressing opinions or presenting statements but also for disseminating the model of liberal democracy. However, the business model of these media, as well as content filtering algorithms, introduced to protect users against information overload, prevented this from happening. To prove this thesis, the author referred to Sunstein's public forum doctrine and proved that social media do not constitute its equivalent. Although the media provided a space for discussion, they did not ensure equal access for senders of messages to recipients and recipients to a variety of content. The topic of the negative impact of social media on liberal democracy is already raised in English scholarship (and is already present in Poland through its translations) and it is also gradually gaining academic currency among Polish researchers. What constitutes a novel contribution to the already available research is the presentation of social media in the context of the utopian high hopes the media initially raised.
    Źródło:
    Polityka i Społeczeństwo; 2020, 18, 3; 63-79
    1732-9639
    Pojawia się w:
    Polityka i Społeczeństwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel approach to photonic generation of periodic triangular radio frequency waveforms
    Autorzy:
    Xiang, P.
    Guo, H.
    Chen, D.
    Zhu, H.
    Wu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/174643.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    microwave photonics
    triangular waveform
    polarization modulator (PolM)
    microwave photonic filter (MPF)
    radio frequency (RF) waveform generation
    Opis:
    A novel approach to photonic generation of triangular radio frequency waveforms with a tunable repetition rate is proposed and analyzed. In the proposed system, a continuous-wave light is modulated by a reference microwave signal through a polarization modulator, and then its output optical sidebands are manipulated by a microwave photonic filter with a negative tap. By properly adjusting the system parameters, full-duty-cycle triangular radio frequency waveforms can be generated after optical-to-electrical conversion, and its repetition rate (frequency) can be tuned in a wide range. A model describing the proposed system is derived, which is verified via computer simulations.
    Źródło:
    Optica Applicata; 2015, 45, 3; 381-391
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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