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10th International Conference on Laser and Fiber-Optical Networks Modeling (LFNM 2010). 2nd IEEE International Workshop on THz Radiation: Basic Research and Applications (TERA 2010)
This work is focused on the quick determination of characteristics of the atmospheric transmission media in optical band. Optical wireless links are briefly introduced. Two of the most important effects influencing optical signal properties in the atmosphere are shortly described. The goal of the work is in analysis of optical intensity profile. Due to the changes in the intensity profile we are able...
The properties of the optical connection of single-mode fibers by laser beams counter-propagating from the ends of these fibers are considered numerically and experimentally. It is established that effective connection of single-mode fibers at the wavelength of 1.55 μm is possible during self-channeling and interaction of optical beams at 0.63 μm in a photo-polymerizing medium. It is shown by computer...
In this report results of modeling and experimental researches of the photonic crystal fibers positioning control method based on the analysis of a measured optical field intensity and calculation of its discrete values autoconvolution are represented. Efficiency and accuracy of a method were checked by test image moving on the set size supervised by the certified measuring instrument of small moving.
We study de nonlinear optical properties of three ionic liquids of family [BMIM]. The ionic liquids are 1-buthyl-3-methylimidazolium tetrafluoroborate, 1-buthyl-3-methylimidazolium trifluoroacetate, and 1-buthyl-3-methylimidazolium Bis((trifluoromethyl)sulfonyl)imide. We calculate the static molecular polarizability (α) and hyperpolarizability (β,γ) using PM3 model and determinate experimentally the...
Structural parameters and physical properties are tabulated for >100 presently known simple and binary acentric chloride crystals. Distribution of the crystals over point symmetry groups has been defined in comparison with that of fluorides. A rosette of ellipses of acentricity has been outlined on the plane of the shortest chemical bond lengths metal-chlorine in the crystal lattice. A combination...
In this paper the results of calculations and optimization of parameters of concave holographic diffraction grating for use in WDM multi/demultiplexer for data transmission systems with polymer optical fibers are presented.
The process of optical formation of dielectric waveguiding structures in transparent photopolymerizable composition (PPC) containing non-polymerizable component (NC) is considered. It is shown, that using NC does not break modes of influencing radiation self-channeling, and on the contrary, allows to provide conditions of matching of the synthesized waveguiding structures with optical fibers. Results...
We considered the possibility of the creation of Faraday rotator for optical switch on the basis of ferrite-garnet film with the "angular phase" magnetic anisotropy. The Faraday effect was researched under the extending of light in the plane of the film in the direction of the plane projection on axis of hard magnetization. Under the magnetization of the film by the field saturation of ≈50...
In report modelling is produced and characteristics of new types of optical spectral-selective elements of the cylindrical form that use effect of light scattering are considered. Dispersion characteristics of indicatrisse of scattering are calculated.
We consider formation of ultrashort quasi-parabolic pulses in conventional silica fibers both in the near and far fields of dispersion. Through solution of nonlinear Schrödinger equation we show that in case of high soliton order N the optical wave breaking effect, occurring in optical fibers during ultrashort pulse propagation, is canceled in the far field of dispersion. This is accompanied by nonlinear...
We analyze the VIPA demultiplexer for different reflection profiles, i.e., uniform, graded, and Gaussian. It is shown that VIPA demultiplexer characteristics can be improved dramatically by innovative reflection profile engineering. These improvements enhance the performance of demultiplexers in UWB-Over-Fiber systems.
In this paper, the performance of Optical Code Division Multiple Access (OCDMA) system is analyzed at different receivers by using Optical Orthogonal Codes (OOCs). Performance analysis is considered for the chip-level detector and optimum receiver. Our results demonstrate that optimum receiver require less BER i.e. 5.70e-008 than chip-level detector i.e. 2.54e-007 for fixed number of users i.e. for...
As-grown ZnO:In crystalline plates demonstrate strong near-band-edge emission related to exciton recombination (380 nm - free excitons; 395 and 406 nm - excitons localized in the impurity centers). Fabry-Perot mode structure is observed for last two bands. Dramatically increasing narrow line (396 nm, Δλ ~ 3.3 nm) is connected with EHP recombination.
A facilities of composite thick films (from 20 to 100 μkm) based on silver nanoparticles in polymethylmethacrylate matrix (Ag-PMMA) as an optical blooming coatings for any optical devices, in particular, silicon cells are investigated. Decreasing of reflection factor for an optical waves more then on 30% from 400 nm to 1100 nm is shown.
CESNET is an association of universities and Academy of science of Czech republic. It is operating a national research and education network (NREN) interconnecting all university cities in the republic. On some lines it it very reasonable to use only one single fiber line. In this paper we discuss technology used on such lines in the CESNET backbone. The key motivation for CLA-based static DWDM systems...
We investigated numerically the reflectivity of aperiodic multilayer mirrors for broadband supercontinuum reflection. It was shown that multilayer mirror based on TiO2/SiO2 with layer thicknesses changed in the nonlinear way can provide high reflectivity from 468 nm to 1600 nm.
Structural parameters and physical properties are considered for >100 presently known simple and binary acentric telluride crystals. Distribution of the crystals over point symmetry groups has been defined in comparison with that of selenides. A rosette of ellipses of acentricity has been outlined on the plane of the shortest chemical bond lengths metal-tellurium in the crystal lattice. A set of...
An automatic control technique of the cross-section microstructured optical fibers geometrical parameters is developed. This method can be used both in the control preform and in the process of drawing into an automated process control system for identify and predict the occurrence of the defect.
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