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1

Investigation of 2D-photonic crystal resonant cavity based WDM demultiplexer

Kannaiyan V., Savarimuthu R., Dhamodharan S. K.

Opto-Electronics Review

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2018

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Vol. 26, No. 2

108--115

EN

In this attempt, Two Dimensional Photonic Crystal (2DPC) Quasi Square Ring Resonator (QSRR) based four channel demultiplexer is proposed and designed for Wavelength Division Multiplexing systems. The performance parameters of the demultiplexer such as transmission efﬁciency, passband width, line spacing, Q factor and crosstalk are investigated. The proposed demultiplexer is composed of bus waveguide, drop waveguide and QSRR. In the proposed demultiplexer, the output ports are arranged separately in odd and even number, where an odd number of ports are located on the right side and even number of ports are located on the left side of the bus waveguide that are used to reduce the channel interference or crosstalk. Further, the refractive index of rods around the center rod is increased linearly one to another in order to improve the signal quality. The resonant wavelengths of the proposed demultiplexer are of 1521.1 nm, 1522.0 nm, 1523.2 nm and 1524.3 nm, respectively. The footprint of the device is of 180.96 µm². Then, a four channel point to point network is designed and the proposed four channel demultiplexer is implemented by replacing a conventional demultiplexer. Finally, functional parameters of the network, namely, BER, receiver sensitivity and Q factor are estimated by varying the link distance. This attempt could create new dimensions of research in the domain of photonic networks.

2

Open source ELMER software based FEM modeling of waveguides and resonant cavities for microwave heating and drying devices

Szałatkiewicz J., Szewczyk R., Kalinowski M., Kataja J., Råback P., Ruokolainen J., Kachniarz M.

Archives of Electrical Engineering

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2017

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Vol. 66, nr 4

745--750

EN

Microwave devices are widely used in the industry and in the specialized laboratory analyses. Development of such devices requires the possibility of modeling of microwave energy distribution in the specific resonant chambers. Until now, such modeling was possible only with the use of commercial software or was limited to specific cases. The paper presents an open-source module for ELMER software for solving timeharmonic Maxwell’s equations, allowing modeling of microwave waveguide lines. Three test cases of different resonant chambers are investigated at 2.45 GHz frequency. Modeling results obtained from the open-source ELMER Vectorial Helmholtz module show that the application of this software can be effective in R&D works, enabling high-tech small and medium enterprises involvement in advanced microwave technology.

3

Wyładowanie mikrofalowe (915 MHz) dużej mocy w argonie pod ciśnieniem atmosferycznym

Miotk R., Jasiński M., Mizeraczyk J.

Zeszyty Naukowe Akademii Morskiej w Gdyni

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2012

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nr 75

181--192

PL

W niniejszym artykule przedstawiono wyniki pomiarów spektroskopowych wyładowania mikrofalowego w argonie pod ciśnieniem atmosferycznym. Badania przeprowadzono dla wyładowania mikrofalowego podtrzymywanego mikrofalami o częstotliwości 915 MHz w mikrofalowym aplikatorze plazmy typu rezonator wnękowy. Na podstawie uzyskanych wyników określono temperaturę wzbudzenia elektronowego, temperaturę cząstek ciężkich plazmy oraz koncentracje elektronów.

EN

In this paper we present results of spectroscopic study of atmospheric pressure microwave argon plasma at high flow rate. The plasma was generated in resonant cavity type microwave plasma source operated at 915 MHz. The aim of research was determination of electron excitation temperature, plasma temperature and electron number density.

4

Spektroskopowe badania wyładowania mikrofalowego w źródle plazmy typu komora rezonansowa zasilana falowodowo

Hrycak B., Miotk R., Jasiński M., Dors M., Scapinello M., Mizeraczyk J.

Zeszyty Naukowe Akademii Morskiej w Gdyni

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2012

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nr 75

169--180

PL

W pracy przedstawiono wyniki spektroskopowych badań wyładowania mikrofalowego (2,45 GHz) pod ciśnieniem atmosferycznym, generowanego w źródle plazmy typu komora rezonansowa. Gazami roboczymi były: argon, azot oraz metan, a także mieszaniny argon/metan oraz azot/metan. Natężenie przepływu gazu roboczego zmieniano w zakresie od 50 do 100 l/min, natomiast moc mikrofal absorbowanych przez wyładowanie wynosiła od 300 do 4000 W. Zmierzone zostały widma z zakresu 300–600 nm. Zmierzone widma emisyjne porównywane były z widmami uzyskanymi przy użyciu programów symulacyjnych w celu wyznaczenia temperatur rotacyjnych i oscylacyjnych jonów azotu N₂+ oraz molekuł węgla C₂, azotu N₂ i cyjanu CN.

EN

In this paper, results of spectroscopic study of microwave (2.45 GHz) plasma at atmospheric pressure in waveguide-supplied resonant-cavity-based plasma source are presented. Pure argon, nitrogen and methane, as well as mixtures argon/methane and nitrogen/methane were used as working gases. Working gas flow rate and microwave absorbed power varied from 50 up to 100 l/min and from 300 up to 4000 W, respectively. The emission spectra in the range of 300-600 nm were recorded. The rotational and vibrational temperatures of N₂+ ions, C₂, N₂ and CN molecules were determined by comparing the measured and simulated spectra.

5

Oparta o układy Spartan 6 wielokanałowa karta pomiarowo-sterująca w systemach sterowania piezoelektrycznych elementów wykonawczych

Przygoda K., Poźniak T., Kacperski D.

Pomiary Automatyka Kontrola

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2012

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R. 58, nr 7

668-670

PL

Prezentowany system umożliwia jednoczesną kompensację 16 wnęk rezonansowych zaopatrzonych w podwójne piezoelektryczne elementy wykonawcze. Pracę urządzenia nadzoruje nowoczesny układ reprogramowalny rodziny Spartan 6, umożliwiający nie tylko równoległe przetwarzanie sygnałów cyfrowych, ale także wymianę informacji cyfrowych z wykorzystaniem szybkich interfejsów szeregowych. Artykuł przedstawia pierwsze wyniki testów działania systemu po zainstalowaniu go w hali eksperymentalnej.

EN

The system presented in the paper allows simultaneous compensation of 16 resonant cavities equipped with double piezoelectric actuators, as depicted in Fig. 1. The device operation is assured by Spartan 6 FPGA equipped with digital signal processing units and fast serial links. The analog part of the system is based on a matrix of power amplifiers that allows driving the piezo elements with voltages up to š70 V. Since the piezo elements can be also used as mechanical vibration sensors, multichannel ADCs have been applied to provide fast data acquisition. The piezo actuator and sensor functionality can be exchanged remotely using switching relays. The input and output voltage as well as output current of the power amplifiers have been used for monitoring purpose. The piezo control system sends and receives data from the main signal processing unit (?TCA). The usage of fast serial links enables data throughput up to 125 Mb/s. The paper presents the results of the system performance measurements after its installation in a cryomodule test bench (CMTB). During the tests the main functionality of the module has been checked, as shown in Tab. 1. The system has been also used for adaptive compensation of cavity detuning during RF pulse operation with accelerating field gradients up to 18 MV/m (see Fig. 7). The presented solution will be applied in the incoming X-Ray Free Electron Laser

6

Narrow spectral band monolithic lead-chalcogenide-on-Si mid-IR photodetectors

Zogg H., Arnold M.

Opto-Electronics Review

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2006

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Vol. 14, No. 1

33-36

EN

Narrow spectral band infrared detectors are required for multispectral infrared imaging. Wavelength selectivity can be obtained by placing passive line filters in front of the detectors, or, the preferred choice, by making the detectors themselves wavelength selective. We review the first photovoltaic resonant cavity enhanced detectors (RCED) for the mid-IR range. The lead-chalcogenide (PbEuSe) photodetector is placed as a very thin layer inside an optical cavity. At least one side is terminated with an epitaxial Bragg mirror (consisting of quarter wavelength PbEuSe/BaF2 pairs), while the second mirror may be a metal. Linewidths are as narrow as 37 nm at a peak wavelength of 4400 nm, and peak quantum efficiencies up to above 50% are obtained.

7

InGaAs for infrared photodetectors. Physics and technology

Kaniewski J., Piotrowski J.

Opto-Electronics Review

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2004

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Vol. 12, No. 1

139--148

EN

InGaAs is a variable band gap semiconductor with excellent transport and optical properties. This makes it attractive for electronic and optoelectronic devices. One of the most important applications is short wavelengh (1–3.6 µm) infrared photodetectors. Such devices are based on multilayer heterostructures with complex band gap and doping profiles. Significant progress in technology of the InGaAs heterostructures has been achieved with MBE and MOCVD growth. We discuss here the status and perspectives of infrared photodetectors based on advanced InGaAs heterostructures.