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Wyświetlanie 1-10 z 23
Tytuł:
A new design of a photonic crystal fiber with a beam shaping effect and flexible management of dispersion and confinement loss
Autorzy:
Huang, Y.
Jiang, P
Yang, H.
Yu, M.
Powiązania:
https://bibliotekanauki.pl/articles/173817.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal fiber
hollow beam
chromatic dispersion
Opis:
A new design of a guiding-index photonic crystal fiber which possesses a beam shaping effect and flexible control of dispersion has been proposed in this paper. It can shape a Gaussian beam into a circular hollow beam with certain dimension, which can be used in optical communication systems with a Cassegrain antenna to improve transmission efficiency by avoiding the loss of energy caused by the subreflector center reflection. In addition, its dispersion and confinement loss can be changed in a broad range by slightly adjusting structural parameters under condition that the hollow beam dimension remains about the same. Fairly practical properties, zero dispersion or flattened dispersion, can be obtained when structural parameters are set appropriately. A series of models with different parameters are analyzed and compared. Results of numerical simulation show that the ultra-low dispersion of 1.802 ps/km/nm can be obtained when λ = 1.31 μm. Several modest design parameters are given as well.
Źródło:
Optica Applicata; 2014, 44, 3; 375-387
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-parameter measurement under fiber bending based on directional resonance coupling in photonic crystal fibers
Autorzy:
Tan, C.
Wang, Q.
Ding, Y.
Li, H.-W.
Wang, M.
Liu, H.
Powiązania:
https://bibliotekanauki.pl/articles/174320.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fiber bending
multi-parameter measurement
photonic crystal fiber
fiber sensing
Opis:
A multi-parameter sensor with enhanced sensitivity based on magnetic fluids infiltrated photonic crystal fiber is proposed. The sensing performances are investigated using the mode coupling theory and finite element method. Four symmetrical defective channels are assembled into the photonic crystal fiber to produce two resonant transmission dips λCV and λCH in vertical and horizontal directions, respectively. Each dip can be split into two relatively shallow dips (λCV1, λCV2 or λCH1, λCH2) when the photonic crystal fiber is bent. Interestingly, the values of (λCH2 – λCH1) and (λCV2 – λCV1) are associated with corresponding bend-curvature but almost unaffected by external temperature or magnetic field. On the contrary, the values of (λCH2 + λCH1)/2 and (λCV2 + λCV1)/2 are sensitive to temperature or magnetic field regardless of the bending condition. Based on above characteristics and the dependence of the magnetic fluids refractive index on temperature and magnetic field, the proposed sensor can measure not only the bend-curvature and bend-direction, but also the temperature and magnetic field.
Źródło:
Optica Applicata; 2018, 48, 3; 449-462
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controllable wavelength conversion based on soliton dynamics in mid-infrared fiber
Autorzy:
Shen, Kangle
Yang, Jian
Zhao, Jiayi
Yang, Xinyu
Yang, Hua
Powiązania:
https://bibliotekanauki.pl/articles/27310109.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
soliton dynamics
photonic crystal fiber
all-optical conversion switches
Opis:
We provide a convenient way to actively control the wavelength conversion of probe waves based on the soliton dynamics in the As2S3 fibers. In this paper, it is found by numerical calculation that wavelength conversion occurs in the frequency domain due to the existence of refractive index barrier. By adjusting the collision position of pump pulse and probe pulse to realize the conversion of probe pulse wavelength, the effect of the power and the incident wavelength of the probe wave on the wavelength conversion are also discussed. This frequency domain conversion is of great use in the mid-infrared region, for example, all-optical conversion switches.
Źródło:
Optica Applicata; 2023, 53, 3; 419--429
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a Novel 1x4 Two-Dimensional Demultiplexer Based on Multicore Photonic Crystal Fiber
Autorzy:
Harrat, Assia Ahlem
Debbal, Mohammed
Ouadah, Mohammed Chamse Eddine
Powiązania:
https://bibliotekanauki.pl/articles/27311973.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Photonic Crystal Fiber
demultiplexer
light coupling
normalized power
light transmission
Opis:
This work suggests a brand-new 1*4 two-dimensional demultiplexer design based on multicore photonic crystal fiber. Numerical models show that the optical signals can be separated in a photonic crystal fiber construction using optical signals with wavelengths of 0.85, 1.1, 1.19, and 1.35 μm injected on the center core and separated into four cores. The innovative design switches different air-hole positions using pure silica layers throughout the length of the fiber to regulate the direction of light transmission between layers. Wavelength demultiplexers are essential parts of optical systemic communications. They serve as a data distributor and can use a single input to produce multiple outputs. The background material is frequently natural silica, and air holes can be found anywhere throughout the length of the fiber as the low-index components. The simulation results showed that after a 6 mm light propagation, the four-channel demux can start to demultiplex.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 3; 469--473
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-loss connection of hybrid fibre optic systems with low sensitivity to wavelength
Autorzy:
Skorupski, K.
Powiązania:
https://bibliotekanauki.pl/articles/220977.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photonic-crystal fiber
measurement of mode-field diameter
fiber characterization
beam combining
Opis:
This paper proposes a method for adjusting light waves propagating in systems composed of photonic fibers, light sources and detection elements. The paper presents the properties of these connections in terms of the loss of signal transmission. Different fiber core areas were analyzed, and measurements of the mode-field diameters (MFDs) of selected fiber structures are presented. The study analyzed two types of LMA (Large Mode Area) fiber structures, and the mode-field diameters of these structures were measured on the basis of the radiation distribution obtained under near-field conditions. The results are compared to the values obtained for a SMF-28 single-mode fiber. The LMA structures analyzed in the paper are characterized by low sensitivity of the MFD parameter to the length of transmitted waves, which creates the possibility of their use as intermediate fibers when connecting optical fibers of different diameters. In the wavelength range from 800 nm to 1600 nm, a 3.5% MFD change was observed for the first investigated LMA structure, and a 1% change was observed for the second. In addition, measurements of the mode-field diameters were also made using the transverse offset method for comparison of the results.
Źródło:
Metrology and Measurement Systems; 2013, 20, 4; 697-704
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft glass spiral photonic crystal fiber for large nonlinearity and high birefringence
Autorzy:
Revathi, S
Inabathini, S
Sandeep, R
Powiązania:
https://bibliotekanauki.pl/articles/173607.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
birefringence
dispersion
finite element method (FEM)
spiral photonic crystal fiber (SPCF)
Opis:
This paper presents a soft glass spiral photonic crystal fiber with circular air holes for achieving high birefringence, large nonlinearity and large negative dispersion. The material used here for designing the fiber is soft glass (SF-57). A central defect air hole is being introduced in the core for achieving high birefringence and for different ellipticity ratios the effect of various optical properties of a photonic crystal fiber are studied. The structure proposed has a high birefringence in the order of 10–2, high nonlinearity of 5828 W–1km–1 and high negative dispersion of –1546.6 ps/nm•km at 0.850 μm. A numerical approach based on the finite element method is used for the design and simulation of the structure. Due to the optimization in the cladding air holes, the fiber can be used as polarization maintaining fibers, in dispersion compensation and other nonlinear applications.
Źródło:
Optica Applicata; 2015, 45, 1; 15-24
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Fotonika w systemach teleinformatycznych nowych generacji
Photonics for new generation of data transmission systems
Autorzy:
Szczepański, P.
Powiązania:
https://bibliotekanauki.pl/articles/317400.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
fotonika
kryształy fotoniczne
krzemowe podzespoły
photonics
photonic crystal fiber
silicon components
Opis:
Omówiono wybrane aspekty związane z rozwojem badań nad przyrządami i zintegrowanymi systemami fotonicznymi, przeznaczonymi w szczególności do współpracy z przezroczystymi sieciami optycznymi nowych generacji, transmisją i przetwarzaniem danych.
The paper presents selected areas of research on devices and integrated photonic systems, in particular those intended for use in new generation transparent optical networks, data transmission and processing.
Źródło:
Telekomunikacja i Techniki Informacyjne; 2009, 3-4; 127-141
1640-1549
1899-8933
Pojawia się w:
Telekomunikacja i Techniki Informacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrahigh nonlinear polarization maintaining dispersion compensating photonic crystal fiber
Autorzy:
Ghunawat, Ashish Kumar
Cherif, Rim
Singh, Ghanshyam
Powiązania:
https://bibliotekanauki.pl/articles/174408.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
photonic crystal fiber
nonlinearity
birefringence
dispersion
nano-dimension slot
finite element method
Opis:
This work describes the suitability of a nano-dimension slot with low index material in the core region to achieve a highly nonlinear, polarization maintaining and dispersion compensating photonic crystal fiber. Our design is composed of a spiral shaped photonic crystal fiber with an elliptical slot made of silicon nanocrystals in the core region. The simulated results show that high nonlinear coefficients at the 1.55 μm wavelength for quasi-TE mode and quasi-TM mode are found to be equal to 1348 and 638 W–1m–1, respectively. The proposed design offers high birefringence up to 0.2503 and large negative dispersion value –1228 ps/nm/km. The proposed fiber has immense potential for realization of all-optical signal processing devices/networks and sensing applications while maintaining its polarization.
Źródło:
Optica Applicata; 2019, 49, 1; 51-63
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microarray-core based circular photonic crystal fiber for high chemical sensing capacity with low confinement loss
Autorzy:
Asaduzzaman, S.
Ahmed, K.
Powiązania:
https://bibliotekanauki.pl/articles/174575.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
circular photonic crystal fiber
confinement loss
elliptical core
chemical sensor
relative sensitivity
Opis:
In this article, a circular photonic crystal fiber based chemical sensor has been presented where core region is designed with an array of elliptical holes. The proposed structure is numerically investigated by using a full vectorial finite element method. From the numerical results, it is observed that introducing an array of elliptical holes helps to obtain the high relative sensitivity and realizes a low confinement loss. In addition, the increase in the value of the diameter of holes in the innermost ring enhances the relative sensitivity. Moreover, the increase in the value of the diameter of holes in the outermost ring reduces the confinement loss. In this work, we have considered an industrially valuable chemical ethanol. Simulation results disclose that the highest relative sensitivity of proposed photonic crystal fiber is 29.25% for ethanol and the confinement loss is 7.68 × 10–7 dB/m at the wavelength 1.5 µm.
Źródło:
Optica Applicata; 2017, 47, 1; 41-49
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 23

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