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    Wyświetlanie 1-4 z 4
    Tytuł:
    Four channel optical demultiplexer based on L2 photonic crystal microcavity
    Autorzy:
    Ammari, Merzoug
    Benmerkhi, Ahlem
    Bouchemat, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/2172853.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photonic crystal
    cavity
    waveguide
    quality factor
    demultiplexer
    FDTD
    filter
    crosstalk
    Opis:
    The wavelength demultiplexing is a particularly important function in integrated optics and can be realized using photonic crystals. The aim is to extract accurately the wavelengths in a data flux. In this work, we investigate a new topologies of wavelength demultiplexing based on two-dimensional photonic crystals constituted of dielectric rods spread in a square network. The studied demultiplexer is based on optical filters with optimized parameters in order to extract four different wavelengths in the vicinity of frequencies corresponding to communication windows. It was found that the crosstalk between the structure channels of the demultiplexer are in the range of –19.19 and – 44.1 dB and the channel spacing is equal to 0.96 nm. The simulation results presented in this paper are performed and analyzed using the FDTD method.
    Źródło:
    Optica Applicata; 2022, 52, 4; 613--625
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new design of a 4-channel optical demultiplexer based on photonic crystal ring resonator using a modified Y-branch
    Autorzy:
    Fallahi, V.
    Seifouri, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/174726.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photonic crystal
    ring resonator
    optical filter
    optical demultiplexer
    photonic band gap
    Opis:
    In this paper, we propose a new structure to design a 4-channel optical demultiplexer using a modified Y-branch structure with 4 hexagonal photonic crystal ring resonators. A new optical filter with a high transfer coefficient and quality factor has been introduced and designed in the present paper using a hexagonal photonic crystal ring resonator, which has then been used to design a 4-channel optical demultiplexer. The proposed demultiplexer has an average transfer coefficient of 95.5% and a high quality factor of 4164.6. It also has a channel spacing of 2.75 nm and a spectral width of 0.4 nm. The maximum and minimum crosstalk values of the channels are –10.5 and –36.5 dB, respectively. To study the photonic band structure, the plane wave expansion method has been used and the finite-difference time-domain method has also been used to analyze the optical behavior of the structure.
    Źródło:
    Optica Applicata; 2018, 48, 2; 191-200
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    All-optical ultrafast switching in a silicon microring resonator and its application to design multiplexer/demultiplexer, adder/subtractor and comparator circuit
    Autorzy:
    Rakshit, J. K.
    Roy, J. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/173324.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    microring resonator
    all-optical signal processing
    optical logic gate
    demultiplexer
    optical multiplexing
    adder subtractor
    Opis:
    In this paper, the possibility of using a silicon waveguide based microring resonator as a nonlinear all-optical switch is described under low power operation through a two-photon absorption effect. All-optical multiplexer/demultiplexer scheme based on two cascaded microring resonators has been proposed and described. The proposed circuits require smaller number of ring resonators and a single circuit consisting of two microring resonators capable to perform both multiplexer/demultiplexer operations by simply interchanging the inputs and outputs. Two optical pump signals represented the two operands of the logical operations to modulate the two microring resonators. The demultiplexer circuit can also perform as a half-adder/subtractor and a single bit data comparator. Numerical simulation results confirming described methods are given in this paper. The performances of the schemes are analyzed by calculating the extinction ratio, contrast ratio and amplitude modulation of the resulting data streams.
    Źródło:
    Optica Applicata; 2016, 46, 4; 517-539
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis of two-dimensional photonic crystal octagonal ring resonator based eight channel demultiplexer
    Autorzy:
    Kannaiyan, V.
    Dhamodharan, S. K.
    Savarimuthu, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/174789.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    two-dimensional photonic crystals
    photonic band gap
    ring resonator
    waveguide
    demultiplexer
    wavelength division multiplexing
    Opis:
    We proposed a high performance eight channel demultiplexer using two-dimensional photonic crystal octagonal ring resonator for wavelength division multiplexing applications. The performance parameters such as transmission efficiency, Q factor, spectral width, resonant wavelength, crosstalk and channel spacing of the proposed demultiplexers are evaluated. The plane wave expansion method manipulates photonic band gap of periodic and non-periodic structure. Finite-difference time-domain method is used to evaluate the performance parameters of designed two-dimensional photonic crystal structure. The proposed demultiplexer provides overall transmission efficiency, Q factor, spectral width of about 98%, 1968 and 0.8 nm, respectively. The ultra-compact eight channel demultiplexer performs better than the reported one. Hence this work can be implemented for real time applications.
    Źródło:
    Optica Applicata; 2017, 47, 1; 7-18
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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