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Design and performance analysis of InP/InGaAsP-MMI based 1310/1550-nm wavelength division demultiplexer with tapered waveguide geometry

100%

Chack D. , Kumar V. , Raghuwanshi S. K.

tom Vol. 23, No. 4

271-277

The design and performance analysis of a 1310/1550-nm wavelength division demultiplexer with tapered geometry based on InP/InGaAsP multimode interference (MMI) coupler has been carried out. Wavelength response of demultiplexer of conventional MMI and tapered input and tapered output (tapered I/O) waveguides geometry of the MMI have been discussed. The demultiplexing function has been first performed by choosing a suitable refractive index of the guiding region and geometrical parameters such as the width and length of MMI structure have been achieved. Access width of tapered I/O waveguides have been adjusted to give a low insertion loss (IL) and high extinction ratio (ER) for the considered wavelengths of 1310 nm and 1550 nm. The total size of the demultiplexer has been significantly reduced over the existing MMI devices. Numerical simulations with finite difference beam propagation method are applied to design and optimize the operation of the proposed demultiplexer.

Integrated 25 GHz and 50 GHz spectral line width dense wavelength division demultiplexer on single photonic crystal chip

100%

Balaji V. R. , Murugan M. , Robinson S. , Nakkeeran R.

tom Vol. 26, No. 4

285--295

We propose a new integrated demultiplexer model using the two-dimensional photonic crystal (2D PC) through the hexagonal resonant cavity (HRC) for the International Telecommunication Union (ITU) standard. The integrated model of demultiplexer for both 25 GHz and 50 GHz has been designed for the first time. The demultiplexer consists of bus input waveguide, drop waveguide, Hexagonal Resonant Cavity (HRC), 6 Air Hole Filter (6-AHF), 7 Air Hole Filter (7-AHF). The 7-AHF is used to filter 25GHz wavelength, and the 6-AHF filter is used to filter 50 GHz wavelength. The Q-factor on the designed demultiplexer is flexible based on the idea of increasing the number of air holes between drop waveguide and resonant cavity. The demultiplexer is designed to drop maximum 8 resonant wavelengths. One side of demultiplexer is able to drop 50 GHz ITU standard wavelengths, which are of 1556.3 nm, 1556.7 nm, 1557.1 nm and 1557.5 nm, and further the other facet is able to drop 25 GHz wavelengths, which are of 1551.4 nm, 1551.6 nm, 1551.8 nm, and 1552.0 nm. The proposed demultiplexer may be carried out within the integrated dual system. This system is able to lessen the architecture cost and the size is miniaturized substantially.

Badanie układów komutacyjnych w kształceniu inżynierów informatyki

72%

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.