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1
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Polarization Mode Dispersion in Birefringent Optical Fibers

100%
Woliński T., Domański A.
Acta Physica Polonica A
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2003
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vol. 103
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issue 2-3
211-219
EN
The paper discusses influence of polarization mode dispersion on performance of polarimetric systems with highly birefringent fibers. It appeared that polarization mode dispersion strongly influences a degree of polarization that depends on coherence of the light source used and simultaneously diminishes dynamics of the output signal.
2
Content available remote

Group Birefringence Measurement in Photonic Liquid Crystal Fibers by Use of Narrowband Light Sources

100%
Budaszewski D., Domański A.
Acta Physica Polonica A
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2009
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vol. 116
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issue 3
285-289
EN
In the paper we present the results of investigating the effective group birefringence of photonic crystal fiber, partially infiltrated with 6CHBT liquid crystal mixture, which is a chemical abbreviation for 4-(trans-4-n-hexylcyclohexyl)isothiocyanatobenzene. We also introduce a novel method of group birefringence measurement based on phenomenon of depolarization of partially coherent light in birefringent media. We use Mueller-Stokes matrix formalism extended by additional depolarization matrix, which gives us possibility to calculate degree of polarization fluctuations of the light propagating in the liquid-crystal infiltrated microstructured optical fibres. We conducted the research for green and red semiconductor laser diodes. The results may contribute in construction of tunable photonic liquid crystal fibers depolarizer. Additionally, we have controlled birefringence of the photonic liquid crystal fibers by external electric field. These research may lead to designing a new type of fiber optic depolarizer based on photonic liquid crystal fibers.
3
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Longitudinal Strain Induced Birefringence in Highly Birefringent Fiber for Dynamic Compensation of Polarization Mode Dispersion

81%
Domański A., Lesiak P., Woliński T.
Acta Physica Polonica A
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2003
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vol. 103
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issue 2-3
221-227
EN
The paper addresses a compensation method of polarization mode dispersion based on longitudinal strain applied to a highly birefringent fiber introduced as apart from optical fiber link. As an introduction a short overview of the polarization mode dispersion compensation methods known up-to-now is done. Dependence of polarization mode dispersion on longitudinal strain is discussed. Some results of experiment with birefringence changes due to longitudinal strain in the bow-tie highly birefringent fiber necessary for dynamic polarization mode dispersion are presented.
4
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Extrinsic Optical Fiber Sensor for Medical Audiometric Applications

81%
Prokopczuk K., Poczęsny T., Sobotka P., Domański A.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
957-961
EN
The paper presents optical fiber sensor designed for medical audiometric measurements. Currently, highly precise audiometric examinations require attachment of reflective element inside the ear. We propose alternative contactless optical and non-invasive method for audiometric applications. Presented sensor utilizes extrinsic intensity modulation combined with interferometric method to measure low amplitude vibrations with flat frequency response curve and no resonance effects. Experiment was performed with tympanic membrane model stimulated by external loudspeaker. Experimental results show usage possibility of presented sensor for laryngological and audiometric tests of ear membrane response, which is important for both diagnosis and implants sensitivity fitting for people with hearing deficits.
5
Publication available in full text mode
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Polarimetric Fiber Optic System for Static and Dynamic Strain Measurement

81%
Konopka W., Woliński T., Domański A., Karpierz M.
Acta Physica Polonica A
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2001
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vol. 99
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issue 1
207-213
EN
Polarization properties of the transmitted optical signal in polarimetric fiber-optic sensing systems for dynamic strain measurements as well as for smart structures applications are presented. The smart structure consists of highly birefringent fiber embedded in an epoxy cylinder.
6
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Fluid flow approximation of time-limited TCP/UDP/XCP streams

81%
Domańska J., Klamka J., Domański A., Czachórski T.
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2014
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issue 2
7
Publication available in full text mode
Content available

The choice of optimal 3-rd order polynomial packet dropping function for NLRED in the presence of self-similar traffic

81%
Domańska J., Augustyn D. R., Domański A.
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2012
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issue 4
8
Content available remote

Optical Nonlinearity in Liquid Crystalline Optical Waveguides

71%
Karpierz M., Domański A., Sierakowski M., Swillo M., Woliński T.
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vol. 95
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issue 5
783-792
EN
The analysis of optical orientational nonlinearity in nematic liquid crystalline planar waveguides is presented. The analyzed nonlinearity leads to unique properties that are not observed in other types of nonlinear waveguides. Theoretical results are confirmed by experimental data obtained in liquid crystalline directional couplers and in the self-focusing effect observed in the planar liquid crystalline waveguides.
9
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Waveguiding in Thin Films with Quadratic Magneto-Optical Medium

62%
Pištora J., Domański A., Bárta O., Staněk F., Postava K., Ciprian D., Kopřiva I.
Acta Physica Polonica A
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2001
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vol. 99
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issue 1
17-23
EN
The waveguiding in thin planar structures with quadratic magneto-optical medium is analysed. The permittivity tensor elements with quadratic magneto-optical constants are specified. From synchronous condition for guided modes in layered system with magnetic ordering the dispersion relation of waveguide is presented. The reflection coefficients for s-polarized light at transversal, longitudinal, and polar configurations as incidence angle function are described. The influence of quadratic magneto-optical effect on the resonant character of the waveguiding term is described in detail. The theory covers the situation in which the optical response of the structure is linear in the amplitude of the incident wave.
10
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Polarimetric and Bragg Optical Fiber Sensors for Stress Distribution and Temperature Measurements in Composite Materials

62%
Lesiak P., Szeląg M., Mileńko K., Woliński T., Domański A., Jędrzejewski K., Boczkowska A.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
698-701
EN
Composite structures are made from two or more constituent materials with significantly different physical or chemical properties and they remain separate and distinct in a macroscopic level within the finished structure. This feature allows us for introducing an optical fiber sensors matrix into the composite material. These sensors can demonstrate stress distribution inside a tested material influenced by external tensions. Two types of the optical fiber sensors, placed into one fiber simultaneously, are used as s matrix structure. One of them is based on application of the Bragg grating structure written inside the core of the fiber. Longitudinal stress modifies changes parameters of the Bragg grating and in the same, spectral characteristics of the light transmitted through the fiber. The second one is based on application of highly birefringent fibers which under external stress introduce polarization changes in the output light. These sensors placed into one fiber give a possibility to the measure two external tensions separately.
11
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Optical Scanner for 3D Radiotherapy Polymer Gel Dosimetry

62%
Sobotka P., Kozicki M., Maras P., Boniecki Ł., Kacperski K., Domański A.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
969-974
EN
Sophisticated techniques employed in radiotherapy for irradiation of tumours require comprehensive dosimetry allowing for precise, high resolution measurements of radiation dose distribution in three dimensions and verification of treatment planning systems. Polymer gel dosimetry has been shown to be a unique technique for such the purpose. If exposed to ionizing radiation, radical polymerisation and crosslinking of monomeric components take place in a 3D polymer gel dosimeter, leading to the formation of large polymeric structures that scatter visible light. This feature allows for optical observation of the effects of the absorbed dose and its distribution. Presently, magnetic resonance imaging is employed most often for the analysis of the 3D polymer gel dosimeters. However, much attention is also being given to the development of optical computed tomography since this technique is hoped to serve as a substitute for expensive and not easily available magnetic resonance imaging. The optical scanner presented in this work consists of a laser diode, a scanning system and a signal detector. A 3D polymer gel dosimeter is measured in an immersion liquid in order to reduce deflection of the light from the dosimeter phantom. The very first results were obtained with the newly constructed scanner and PABIG^{nx} 3D polymer gel dosimeter, which was inhomogeneously irradiated with ^{192}Ir brachytherapy source. The results have been contrasted with those for the magnetic resonance imaging and are presented in this work together with the description of the developed instrument. Currently, the optimization of the optical scanner is performed.
12
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Influence of Angular Orientation of the Embedded Highly Birefringent Fiber on PMD Changes under Axial Stress

52%
Budaszewski D., Lesiak P., Plaga R., Rajan G., Semenova Y., Farrell G., Boczkowska A., Domański A., Woliński T.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
575-578
EN
In the paper we present results of the research on polarization mode dispersion changes inside the polarimetric optical fiber sensors based on highly birefringent optical fibers embedded into composite materials with different angular orientations of the optical axes. Based on measurements made for different types of highly birefringent optical fiber sensors we have shown that strain sensitivities after lamination process are different in comparison to the data obtained before lamination. Our results indicate that polarization mode dispersion in side-hole highly birefringent fibers under axial stress strongly depends on fiber orientation in the composite material suggesting that orientation of the polarization axes of the highly birefringent fiber can be responsible for behavior of the fiber inside the composite material.
13
Content available remote

Polarimetric Optical Fiber Sensors for Dynamic Strain Measurement in Composite Materials

42%
Domański A., Bieda M., Lesiak P., Makowski P., Szeląg M., Poczęsny T., Prokopczuk K., Sobotka P., Chychłowski M., Sierakowski M., Woliński T.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
399-401
EN
Polarimetric optical fiber sensors possess possibility of temperature compensation, dynamic and integral system of strain monitoring, as well as low cost of photo-detecting elements. In the paper we present results of the sensor analysis with different kinds of birefringent optical fibers leading to an optimal setup for dynamic strain monitoring in composite materials. A great attention is put on parameters of the light sources like coherence and width of spectrum and their influence on dynamics of the strain sensor.
14
Content available remote

Photonic Liquid Crystal Fibers with Polymers

42%
Woliński T., Tefelska M., Mileńko K., Siarkowska A., Budaszewski D., Domański A., Ertman S., Orzechowski K., Rutkowska K., Sierakowski M., Nowinowski-Kruszelnicki E., Dąbrowski R., Mergo P.
Acta Physica Polonica A
|
2013
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vol. 124
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issue 3
613-616
EN
Photonic liquid crystal fibers with polymers constitute a new solution based on liquid crystals and microstructured polymer optical fibers opening up new areas in innovative sensing and photonic devices applications. Compared with their silica-based microstructured fibers, it is easier to fabricate exotic microstructured polymer optical fibers by extrusion or drilling at low temperature; their nonlinearity is potentially stronger, the range of available polymers that may be drawn is more diverse and the biocompatibility of polymers is often better. Liquid crystals due to their attractive properties i.e., the high birefringence, high electro-optic and thermo-optic effects are a very good candidate for microstructured polymer optical fiber infiltration to obtain tunable all-in-fiber innovative photonic devices. The paper will discuss basic properties and possible applications of the polymer photonic liquid crystal fibers that will arise from their high optical tunability with external and internal factors. Current research effort is directed towards two main solutions: photonic crystal fibers and microstructured polymer optical fiber-based structures, both infiltrated with liquid crystals of tailored optical properties.
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