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Siatki Bragga w wodorowanych włóknach telekomunikacyjnych

100%

Jędrzejewski K. , Lewandowski L. , Helsztyński J. , Jasiewicz W.

tom Vol. 46, nr 2-3

7-8

Zrealizowano technologię wysokociśnieniowego wodorowania standardowych włókien telekomunikacyjnych. Efekt fotoczułości był nadal widoczny w wiele miesięcy po procesie wodorowania dzięki przechowywaniu próbek w warunkach silnego zamrożenia. Otrzymano źródło taniego fotoczułego materiału wyjściowego potrzebnego do wykonywania siatek Bragga.

The technology of hydrogen loading into fibers was developed. Photosensitivity effect was visible several months after the hydrogenation process if samples were kept in deep freezing conditions. Cheap and simple source of photosensitized fiber samples was realized.

Analysis of nonlinear parity-time symmetric four-layer Bragg grating

100%

Witoński P. , Mossakowska-Wyszyńska A.

tom Vol. 52, nr 3

329--344

The one dimensional PT (parity time) symmetric four-layer Bragg grating with gain and loss saturation effects is analyzed taking into account the evolution of the field amplitudes. The investigated structure has modulated real and imaginary parts of refractive index. The functional configurations of the Bragg grating have been considered, showing the behavior of this structure acting as a discrete device and as a component of an integrated circuit. The obtained characteristics illustrate the influence of the saturation effect on the intensity of the output wave at a given intensity of the incident plane wave for different values of gain and loss saturation intensities of the PT structure. The performed analysis shows the bistability of the structure and a strong influence of the incident wave intensity on the properties of light propagation nonreciprocity.

Experiment of the monitoring prestress loss of prestressed concrete beams with damages under static loading

51%

Wang J. , Li G. , Lan C. , Guo N.

tom Vol. 69, nr 1

437--451

In this paper, based on the feasible method and sensors for the full-scale prestressed monitor, the novel optical fiber sensors and the traditional monitoring sensors will be set up into two prestressed concrete beams with the same geometrical dimensions, material properties, and construction conditions, etc. to investigate the working state of the novel sensors and obtain the evolution law of prestress loss of the prestressed feature component under the static load. The results show that the evolution law of prestress loss of the loaded beam under the condition of no damage state and initial crack is the same as the non-loaded one; however, the prestress loss increases with the increase of time under the situation with the limit crack. The total loss of the prestressed beam with the limit crack is 36.4% without damage. The prestress loss of the prestressed beam under the static load increase with the development of the crack (injury).