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1
Content available remote Birefringence of glass-air photonic crystal fibre induced by elliptical microholes of cladding
Kujawa I., Buczyński R., Pysz D., Martynkien T., Thienpont H.
Materiały Ceramiczne
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2012
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T. 64, nr 1
22-25
EN
In this paper, we report on the fabrication of the birefringent photonic crystal fibre with a photonic cladding composed of elliptical holes ordered in a rectangular lattice. Choice of such configuration allows obtaining birefringence in photonic crystal fibres. In this case two-fold rotational symmetry is achieved and the polarized orthogonal modes (HE11x and HE11y) are not degenerated. We discuss the influence of structural parameters including the ellipticity of the air holes and the aspect ratio of the rectangular lattice on the birefringence and on the modal properties of this glass-air microstructural fibre.
PL
W artykule przedstawiono uzyskane włókno dwójłomne o anizotropii optycznej wywołanej eliptycznym kształtem elementów płaszcza fotonicznego i prostokątnym kształtem przekroju. Wyraźnie określona dwuosiowość prowadzi do dużych różnic efektywnych współczynników załamania dla dwóch podstawowych i ortogonalnie spolaryzowanych modów HE11x i HE11y. Dzięki temu mody te nie są zdegenerowane. Zależnie od parametrów strukturalnych włókna możliwe jest uzyskanie znacznych wartości dwójłomności. W artykule przedstawiono zarys technologii wytwarzania szklanych włókien tego typu, przedyskutowano wpływ parametrów strukturalnych na wartość dwójłomności i własności modowe oraz wyniki symulacji i pomiarów dla uzyskanego włókna.
2
Content available remote Light propagation in highly birefringent photonic liquid crystal fibers
Ertman S., Czapla A., Woliński T. R., Nasiłowski T., Thienpont H., Nowinowski-Kruszelnicki E., Dąbrowski R.
Opto-Electronics Review
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2009
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Vol. 17, No. 2
150-155
EN
Photonic liquid crystal fibers have already been demonstrated as a promising perspective for creation of new classes of dynamically tunable optical fiber devices. By combining different geometries of photonic crystal fibers with a variety of different liquid crystals it is possible to obtain a new generation of fibers with dynamically tunable properties, e.g., transmission spectra, attenuation or dispersion. In this paper, tunable birefringence in a commercially available highly birefringent Blazephotonics PM-1550-01 photonic crystal fiber selectively filled with a low birefringence liquid crystal has been experimentally demonstrated. Theses experimental results have been compared with simulations based on the multipole method.
3
Content available remote Depolarization of light in microstructured fibers filled with liquid crystals
Budaszewski D., Domański A. W., Czapla A., Ertman S., Woliński T. R., Nasilowski T., Thienpont H.
Opto-Electronics Review
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2009
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Vol. 17, No. 2
156-160
EN
In the paper we analyze microstructured optical fibers filled with typical nematic liquid crystals, i.e., 5CB and 6CHBT under influence of external electric field or temperature. We use the modified Mueller matrix method with an additional depolarization matrix to calculate degree of polarization changes of the light propagating in the liquid-crystal infiltrated microstructured optical fibers. Preliminary experimental results of light depolarization measurements during propagation in these microstructured fibers are also presented.
4
Content available remote Badania rozkładu współczynnika załamania polimerowych struktur mikrooptycznych za pomocą systemu tomografii interferencyjnej
Krajewski R., Kujawińska M., Kumar N., Kozacki T., Thienpont H.
Przegląd Elektrotechniczny
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2008
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R. 84, nr 5
161-164
PL
W artykule przedstawione zostały wyniki pomiarów zintegrowanego dwuwymiarowego rozkładu współczynnika załamania (projekcji) elementów optycznych wykonanych za pomocą niskonakładowych technologii wytwarzania. Pomiar polega na analizie rozkładu fazy wiązki światła przechodzacej przez badaną próbkę. Do wyznaczenia rozkładu współczynnika załamania zastosowany został dedykowany algorytm kompensujący wpływ kształtu powierzchni na wynik pomiaru. Skorygowane projekcje stanowią dane wejściowe do rekonstrukcji tomograficznej n(x,y,z). Wyniki pomiarów są punktem wyjścia do zaprojektowania nowej generacji niskonakładowych układów mikrointerferometrycznych.
EN
In this paper we present the recent results of the integrated 2D refractive index distribution (projections) measurements of high aspect ratio optical structures made with low-cost fabrication techniques. Measurements methodology base on 2D integrated phase measurements by means of interferometric method. Phase distribution measurements were followed by dedicated algorithm of refractive index determining. The corrected projections captured for multiple angular position of an object are the basis for 3D tomographc reconstruction of refractive index n(x,y,z). Presented measurements play an important role in the proper modeling of the new family of low-cost microinterferometric systems.
5
Content available remote Light polarization fingerprints on nonlinear dynamics of vertical-cavity surface-emitting lasers
Panajotov K., Sciamanna M., Gatare I., Arizaleta Arteaga M., Thienpont H.
Opto-Electronics Review
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2008
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Vol. 16, No. 4
337-346
EN
In this paper we summarize the recent results on nonlinear dynamics of vertical-cavity surface-emitting lasers (VCSELs) which are bearing the fingerprints of the particular polarization properties of VCSELs. Due to the surface emission and cylindrical symmetry, VCSELs lack strong polarization anisotropy and may undergo polarization switching and polarization mode-hopping. This provides new specificities to the rich nonlinear dynamics induced in VCSELs by an external perturbation. We unveil both experimentally and theoretically these new specificities for the case of optical feedback, optical injection, and unidirectional synchronization between VCSELs.
6
Content available remote Tunable properties of light propagation in photonic liquid crystal fibers
Szaniawska K., Nasilowski T., Woliński T. R., Thienpont H.
Opto-Electronics Review
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2006
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Vol. 14, No. 4
339-343
EN
Tunable properties of light propagation in photonic crystal fibers filled with liquid crystals, called photonic liquid crystal fibers (PLCFs) are presented. The propagation properties of PLCFs strongly depend on contrast between refractive indices of the solid core (pure silica glass) and liquid crystals (LCs) filing the holes of the fiber. Due to relatively strong thermo-optical effect, we can change the refractive index of the LC by changing its temperature. Numerical analysis of light propagation in PLCF, based on two simulation methods, such as finite difference (FD) and multipole method (MM) is presented. The numerical results obtained are in good agreement with our earlier experimental results presented elsewhere [1].
7
Content available remote Polarisation switching in vertical-cavity surface-emitting lasers: from experimental observations to applications
Verschaffelt G., Panajotov K., Albert J., Nagler B., Peeters M., Danckaert J., Veretennicoff I., Thienpont H.
Opto-Electronics Review
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2001
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Vol. 9, No. 3
257-268
EN
Touted as promising components for present and future data-communication and sources for photonic switching fabrics, vertical-cavity surface-emitting lasers (VCSELs) have been studied in detail during the past years, with a focus on their static light-current and dynamic intensity modulation characteristics. Their superior beam quality, low power consumption, Gigahertz modulation bandwidth and the possibility of manufacturing these devices in 2D arrays are often cited as substantial advantages compared to traditional edge-emitting semiconductor lasers or light emitting diodes. A disadvantage of VCSELs is that the polarisation of the emitted light is not defined a priori due to the VCSEL’s quasi-cylindrical symmetry and its direction of lasing perpendicular to the active region. However, real VCSELs do emit linearly polarised light and often polarisation switching from one state to the orthogonal one is observed as the current is changed. In this contribution we will discuss the experimental characteristics of this intriguing polarisation switching phenomenon. We will give an overview of various physical mechanism proposed to explain the polarisation behaviour of these devices and we will illustrate the use of this polarisation switching in the implementation of reconfigurable optical interconnects.
8
Content available remote Photonic systems for local image processing
Buczyński R., Viet K. B., Szoplik T., Veretennicoff I., Thienpont H.
Opto-Electronics Review
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2001
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Vol. 9, No. 3
215-228
EN
Local image processing is about performing a basic group of simple arthmetic and logic operations an a limited neighbourhood of very pixel in 2 D-represented data. The parallel architecture of optoelectronic processors makes these machines especially well suited to perform such local operations. In this paper we present some possible architectures of such processors and a proof-of-principle demonstrator based on present-day technology. We discuss applications and highlight limitations.
9
Content available remote Free-space micro-optical modules: the missing link for photonic interconnects to sillicon chips
Thienpont H., Baukens V., Volckaerts B., Ottevaere H., Debaes C., Vervaeke M., Tuteleers P., Vynck P., Hermanne A., Hanney M., Brunfaut M., Van Campenhout J. M., Veretennicoff I.
Opto-Electronics Review
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2001
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Vol. 9, No. 3
238-247
EN
We report on design, fabrication, characterisation, and demonstration of scalable multi-channel free-space intercinection components with the potential for Tb/s cm² aggregate bit rate capacity over inter-chip interconnection distances. The demonstraton components are fabricated in a high quality optical plastic, PMMA, using an ion-based rapid prototyping technology that we call deep proton lithography. With the presently achieved Gigabit/s data rates for each of the individual 16channels with a BER smaller than 10⁻¹³ and with inter-channel cross-talk lower than -22 dB the module aims at optically interconnecting 2D opto-electronic VCSEL and receiver arrays, flip-chip mounted on CMOS circuitry. Furthermore, using ray-tracing software and radiometric simulation tools, we perform a sensitivity analysis for misalignment and fibrication errors on these plastic micro-optical modules and we study industrial fabrication and material issues related to the mass-replication of these components through injecton-molding techniques. Finally, we provide evidence that these components can be mass-fabricated in dedicated, highly-advanced optical plastics at low cost and with the required precision.
10
Content available remote Functional properties of dual-rail photonic image processor using comparator arrays
Buczyński R., Szoplik T., Jankowski S., Veretennicoff I., Thienpont H.
Optica Applicata
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2001
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Vol. 31, nr 2
453-465
EN
We extend the description of a discrete-time cellular neural network, depicting the behaviour of both cellular and morphological processors, to any type of dual-rail processors. We show that a system with two arrays of differential pairs of transceivers can be treated as a two-layer cellular network and that it can perform morphological and rank order filter operations. As an illustration we built and tested a dual-rail processor composed of arrays of GaAs optical thyristor differential pairs and highlight experimental results on median filtering
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