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Reconfigurable optical multiplexer based on liquid crystals for polymer optical fiber networks

100%

Lallana P. C. , Vázquez C. , Pena J. M. S. , Vergaz R.

tom Vol. 14, No. 4

311-318

In this work, different novel 3×1 multiplexer structures for being used in polymer optical fiber networks are proposed. Designs are compact, scalable, and of low consumption, capable of operating in a large wavelength range simultaneously 660, 850, and 1300 nm, due to the use of nematic liquid crystal cells. Light that comes from each input port is handled independently and eight operation modes are possible. Control electronics has been made using a programmable integrated circuit. Electronic system makes available the managing of the optical stage using a computer. An additional four optical sensors have been included for allowing the optical status checking. Finally, a polarization independent multiplexer has been implemented and tested. Insertion losses less than 4 dB and isolation better than 23 dB have been measured. In addition, 30-ms and 15-ms setup and rise times have been obtained. The proposed multiplexer can be used in any polymer optical fiber network, even in perfluorinated graded index one, and it can be specially useful in optical sensor networks, or in coarse wavelength division multiplexing networks.

Badanie układów komutacyjnych w kształceniu inżynierów informatyki

63%

MARSZAŁEK A.

nr 3

107-112

W artykule ukazano i uzasadniono umiejscowienie problematyki badań elektronicznych układów komutacyjnych w treściach kształcenia inżynierów kierunku informatyka. Na bazie analizy rozwiązań istniejących opisano projekt i realizację stanowiska do badania multipleksera, demultipleksera oraz szyny przesyłu danych. Stanowisko poddano wielokryterialnej ocenie sędziów kompetentnych, dokonano analizy wyników badań i wyciągnięto wnioski.

The article presents and justifies the position of the research issues of electronic switching circuits within the curriculum of educating computer science engineers. Based on the analysis of existing solutions we have described the design and implementation of a stand to study the multiplexer, demultiplexer and data transfer bus. The stand has undergone assessment of competent judges, analysis of the research results and conclusions reached thereafter.

Four-channel multiplexer on surface plasmon polaritons development and research

51%

Nevinskyі D. V. , Zakalyk L. I. , Lebid S. Y. , Korzh H. I. , Pavlysh V. A.

tom Vol. 7, no. 1

7--11

Simulation of the surface plasmon polariton (SPP) distribution in the 10 μm long four-channel multiplexer is conducted in present paper. The excitation of the SPP was done using the 632.8 nm pulse laser with 50 fs pulse duration. The simulation processes of the SPP propagation in the fourchannel multiplexer were performed for the latter switched as a splitter as an adder. Though the obtained signal strength is low due to ohmic losses and signal reflections in the middle of the waveguide it is possible to registrate it. The detailed procedure of waveguides preparation, analysis and registration of SPP propagation is described in the paper. For the proposed model verification the two-channel 20 μm long splitter was formed by optical projection lithography. Studies have shown that the SPP is distributed throughout the whole structure of the 20 μm long two-channel splitter with a partial extinction due to ohmic losses.