Agnieszka Szymanska

Polarimetric optical fibres with elliptical liquid-crystal core

Polarization properties of elliptical-core liquid crystal optical fibres have been investigated and the experimental results on the liquid crystal fibres in the polarimetric configuration subjected to the influence of hydrostatic pressure and temperature are presented.

Propagation Effects in Liquid Crystal-Core Optical Fiber Waveguides

Abstract Propagation effects in liquid crystal-core optical fiber waveguides have been investigated. In theory, propagation properties of the TE01 and TM01 modes in the waveguide composed of a low-birefringence nematic liquid crystal acting as an optical-fiber core have been analyzed. For smaller diameters of the liquid crystal-core, the TE01 mode is guided and TM01 is the leaky mode, but for larger diameters differences between both modes decrease. The paper presents initial experimental transmission characteristics of the liquid crystal fiber subjected to the influence of selected external perturbations. The experimental results have been compared with the theory in view of some typical optical fiber parameters suggesting a great potential of the liquid crystal-core fibers for environmental sensing.

Polarization properties of liquid crystal-core optical fiber waveguides

Abstract Polarization effects in liquid crystal-core optical fiber waveguides have been investigated based on extremely low-birefringence liquid crystal mixture acting as an optical fiber core characterized by an index ellipsoid. In certain conditions the liquid crystal elliptical-core fiber acts as a single-polarization fiber in which only one polarization mode is guided. The paper presents first experimental results of the liquid crystal fiber in the polarimetric configuration subjected to the influence of hydrostatic pressure and electric field.

Polarization properties of birefringent systems with liquid crystal-core optical fibers

Polarization phenomena in birefringence optical fiber systems comprising highly bircfringent (HB) polarization-maintaining fibers and elliptical-core liquid crystal-core fibers (LCFs) have been investigated. Elliptical cores of the LCFs are composed of nematic mixtures characterized by extremely low values of refractive indices.

Gigabit ethernet link parameters influence on quality of transmission and cost analysis of protected metropolitan area networks

This paper contains analysis of fiber optic link parameters influence on quality of digital data transmission. Simulations with variable transmitter launch power, extinction ratio, signal rise/fall time and link length were realised. Network demands protection types influence on the cost of network implementation was researched in various levels of topology complexity.

Microstructure and Mechanical Properties of the Stainless Steels Obtained by Sintering Mixtures of AISI 316L and Silicon Powders

The aim of the study was to obtain a ferritic-austenitic stainless steel through sintering of the mixture of austenitic steel AISI 316L powders with silicon in the amount ranging from 1 to 7%. The pressed mixtures were sintered at 1240oC for 60 minutes under hydrogen atmosphere. The results of the silicon admixture on the density, porosity, microstructure and mechanical properties of the sintered specimens are discussed.

The Structure of Nanocrystalline Stainless Steel Powders Obtained by Ball Milling and Duplex Stainless Steel Formed by Their Sintering

The article illustrates the influence of ball milling of the 316L and 434L stainless steel powders as well as their mixture (50 wt. % of 434L + 50 wt. % of 316L) on their structure. Medium size of the grains (about 30 nm) was obtained after 110 hours of milling. The powders that obtained were pressed isostatically and sintered by impulse plasma method in vacuum. The samples were then characterized using an optical microscope equipped with a computer image analyzer, scanning electron microscope and X-ray diffractometer.

Propagation properties of elliptical liquid-crystal core fibers

The paper presents propagation properties of elliptical fibers with liquid crystal core under the influence of temperature, hydrostatic pressure and external electric field. Initial data on transmission losses of the liquid crystal fiber in the 0.5 - 2.0 μm spectral range is also presented. The scattering loss was found to be around 0,2 dB/cm for elliptical-core (4x18 μm) liquid crystal fibers that is in accordance with other measurements, whereas a significant increase to about 5 dB/cm was observed in liquid crystal capillaries.

Interferometric investigations of elliptical-core liquid crystal fibers

The paper presents a new approach to structural investigations of elliptical-core liquid crystal fibers (ECLCFs) by using the interferometric method. The method enables to confirm envisaged molecular distribution within the elliptical core previously observed in polarimetric configuration.

Polarimetric sensors with liquid-crystal-core optical fibers

Polarization effects in liquid crystal-core optical fibers have been investigated and the initial experimental results of the liquid crystal fiber in the polarimetric configuration subjected to the influence of hydrostatic pressure and temperature are presented.