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1
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Polarization in Optical Fibers

100%
Woliński T.
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vol. 95
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issue 5
749-760
EN
Physical origin of polarization phenomena in highly birefringent optical fibers including nonlinear optical effects is discussed and their impact on applications to polarimetric optical fibers sensors is underlined.
2
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Polarization Mode Dispersion in Birefringent Optical Fibers

64%
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.
3
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Light Propagation in Liquid Crystal Fiber Structures

64%
Nasiłowski T., Woliński T.
Acta Physica Polonica A
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2001
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vol. 99
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issue 1
193-200
EN
The paper analyzes the light propagation in anisotropic liquid crystal fiber structures in order to find the possibilities to apply them to control and switch the polarization state and modulate some parameters of the transmitted light. The long term goal and motivation of the authors was the suggestion to replace the light modulating liquid crystal cell by a new generation of liquid crystal waveguides as an all-fiber light modulator, as well as sensors for different environmental parameters.
4
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Polarization Properties of Liquid-Crystal Elliptical-Core Fibers

64%
Szymańska A., Woliński T.
Acta Physica Polonica A
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2001
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vol. 99
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issue 1
201-206
EN
Polarization properties of liquid-crystal core optical fibers have been investigated. The liquid-crystal fiber is characterized by elliptical anisotropic core with low birefringence liquid crystal introduced by capillary axis. The paper presents also initial experimental results of the liquid-crystal fiber in the polarimetric configuration subjected to the influence of selected perturbations.
5
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Beam Propagation Method for Liquid Crystal-Core Optical Fiber Waveguides

64%
Szymańska A., Woliński T.
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vol. 95
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issue 5
761-766
EN
Propagation effects in liquid crystal-core optical fiber waveguides were investigated and simulated by means of beam propagation method. Spatial propagation beam distribution for anisotropic liquid crystal fibers was defined by using BPM_CAD software package (courtesy of Optiwave Corporation). The field intensity was related to the refractive index of core at the liquid crystal fiber in two different waveguide configurations: planar and radial, whereas the number of the propagating modes was calculated. Numerical results were compared with some experimental data formerly obtained.
6
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Light Modulation in Elliptical-Core Liquid Crystal Fibers

64%
Nasiłowski T., Woliński T.
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vol. 95
|
issue 5
767-775
EN
An original idea of external parameters (electric field, temperature, pressure etc.) monitoring is presented. After the theoretical analysis of the light modulation in a liquid crystal and elliptical-core anisotropic fiber the latest experimental results are reported. Due to measurands-induced changes in birefringence and propagation conditions the liquid crystal and elliptical-core fiber uniting unique advantages of liquid crystals and quality of fiber technology acts as a sensing medium and can be used for continuous monitoring of different external parameters.
7
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Longitudinal Strain Induced Birefringence in Highly Birefringent Fiber for Dynamic Compensation of Polarization Mode Dispersion

52%
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.
8
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Numerical and Experimental Analysis of Photonic Crystal Fiber Selectively Infiltrated with Silicon Oil

52%
Mileńko K., Rutkowska K., Woliński T.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
589-591
EN
In this paper we demonstrate the numerical and experimental investigation of the photonic crystal fiber selectively infiltrated with polymer material, that is a silicon oil DC-704. The results are compared with those obtained for fully infiltrated fiber. The influence of the infiltration on light propagation properties, as well as on temperature sensitivity of the fiber are also presented. The infiltration causes the formation of photonic bandgap effect, and in the case of full infiltration the bandgaps shift equal to 50 nm is observed due to the change in external temperature in the range of about 40C (i.e. from 24 to 61°C).
9
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Polarimetric Fiber Optic System for Static and Dynamic Strain Measurement

52%
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.
10
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Towards tuning of thermal sensitivity of the long period fiber gratings using a liquid crystal layer

52%
Czapla A., Bock W., Mikulic P., Woliński T.
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2010
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issue 4
11
Content available remote

Hollow-Core Bragg Fiber for Bio-Sensing Applications

52%
Mileńko K., Hu D., Shum P., Woliński T.
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issue 6
1205-1208
EN
Theoretical analysis of propagation properties in a hollow-core Bragg fiber for bio-sensing applications has been demonstrated. Based on the Bragg fiber we propose a resonant sensor that operates on changes in refractive index of aqueous solution placed inside the hollow core. By using the transfer matrix method we analyzed the confinement loss of the TE_{01} mode in the hollow-core Bragg fiber. We have shown the influence of the fiber geometry on the changes in the confinement loss. Spectral sensitivity and resolution of the sensor are also presented.
12
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A Novel Electrically Tunable Long-Period Fiber Grating Using a Liquid Crystal Cladding Layer

52%
Czapla A., Woliński T., Nowinowski-Kruszelnicki E., Bock W.
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issue 6
1104-1107
EN
The main aim of the presented work is the integration of a long-period fiber grating and a liquid crystal into a hybrid structure, in order to develop an innovative fiber optic device controlled by an external electric field. The studied long-period fiber grating was fabricated using UV irradiation in a boron co-doped fiber (PS1250/1500, manufactured by Fibercore). As a liquid crystal we used a typical 5CB nematic liquid crystal. The sensing mechanism of the proposed loss filter relies on long-period fiber grating attenuation bands sensitivity to optical properties of the liquid crystal layer. The results obtained show that the long-period fiber grating with a nanosized liquid crystal layer exhibits one order of magnitude higher electrical sensitivity and a lower level of the voltage control than the long-period fiber grating with a micro-sized liquid crystal layer.
13
Content available remote

Spectral Tuning of the Long-Period Fiber Gratings by Using Low Birefringence Liquid Crystals

45%
Czapla A., Bock W., Woliński T., Dąbrowski R., Nowinowski-Kruszelnicki E.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
589-592
EN
The work presented in this paper is focused on investigation of the spectral properties of the long-period fiber gratings combined with the liquid crystals, named liquid crystal long-period fiber gratings. The experiments carried out showed that the proposed designs of the liquid crystal long-period fiber gratings can offer very interesting spectral properties and can introduce a new level of sensitivity. In particular, a high-efficiency thermal tuning of the long-period fiber gratings coated with low-birefringence liquid crystal layers could be achieved and gave rise to a fast and wide switching ability of the attenuation bands within their transmission spectrum.
14
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Comparison of Different Liquid Crystal Materials under Planar and Homeotropic Boundary Conditions in Capillaries

45%
Chychłowski M., Ertman S., Nowinowski-Kruszelnicki E., Dąbrowski R., Woliński T.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
582-584
EN
We present a thermally-induced liquid crystal orientation method by applying an extra orienting layer onto an inner capillary surface that can induce either planar or homeotropic liquid crystal boundary conditions. Experimental evidence of boundary-induced orientation in two types of liquid crystal (nematic, chiral nematic) in a capillary are shown.
15
Content available remote

Optical Nonlinearity in Liquid Crystalline Optical Waveguides

45%
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.
16
Content available remote

Polarimetric and Bragg Optical Fiber Sensors for Stress Distribution and Temperature Measurements in Composite Materials

39%
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.
17
Content available remote

Propagation Effects in Photonic Liquid Crystal Fibers with a Complex Structure

39%
Tefelska M., Chychłowski M., Woliński T., Dąbrowski R., Rejmer W., Wójcik J.
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|
issue 6
1259-1261
EN
Chiral nematic liquid crystals are very interesting materials to infiltrate photonic crystal fibers since they are characterized by unique optical properties such as selective Bragg reflection, circular dichroism, and optical activity. In this paper the latest experimental results of the photonic crystal fibers filled with new chiral nematic liquid crystals are presented. Spectral properties of the light propagating in the photonic liquid crystal fibers have been measured and analyzed.
18
Content available remote

Photo-Induced Orientation of Nematic Liquid Crystals in Microcapillaries

39%
Chychłowski M., Ertman S., Tefelska M., Woliński T., Nowinowski-Kruszelnicki E., Yaroshchuk O.
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issue 6
1100-1103
EN
Axial and transversal orientational configurations of a nematic liquid crystal 6CHBT are realized inside glassy cylindrical capillaries by using photoalignment technique. It is demonstrated that this principle can be effectively used to enforce liquid crystal alignment in the desirable direction. It can be applied to control liquid crystal alignment in the photonic crystal fibers showing great potential for the modern telecommunication technologies.
19
Content available remote

Numerical Simulations of Electrically Induced Birefringence in Photonic Liquid Crystal Fibers

39%
Ertman S., Woliński T., Beeckman J., Neyts K., Vanbrabant P., James R., Fernández F.
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issue 6
1113-1117
EN
It has been recently experimentally demonstrated that propagation and polarization properties of the photonic liquid crystal fibers can be effectively tuned with the electric field. In particular, effective electric tuning of the phase birefringence has been obtained in the photonic liquid crystal fibers based on the high index glasses. Accurate numerical simulations of the impact of electric field on the guiding properties of the photonic liquid crystal fibers require complex methods, in which all important physical properties of the liquid crystal are taken into account (optical anisotropy, molecular orientation and relatively high losses). In this paper we present two different numerical approaches based on the finite element method. First one utilizes the simplified assumption of the "collective tilt" of molecules, and gives rough estimation of the phase birefringence tuning range. The second approach is much more rigorous, since electrically induced reorientation of the liquid crystal is calculated with a Q-tensor method giving the values of the inhomogeneous permittivity tensor. The value of the electrically induced birefringence calculated with the second method is in a good agreement with the experimental results.
20
Content available remote

Influence of Angular Orientation of the Embedded Highly Birefringent Fiber on PMD Changes under Axial Stress

33%
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.
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