Vol. 17 No. 1 (2025)

View Vol. 17 No. 1 (2025)

This special issue, dedicated to the 21st Conference on Optical Fibers and Their Applications (OFTA 2025), taking place in Białystok, Poland, in January 2025, consists of 10 papers. Specifically, the paper on the fabrication and properties of Erbium-doped Gallo-Germanate glass thin films via RF-sputtering explores the potential of Er³⁺-doped thin films for integrated optics emission sources. Research on Europium-doped nanocomposite TiOx:SiOy layers demonstrates how Eu³⁺ ions reduce optical losses by affecting crystallization and surface roughness. Luminescent monitoring of Eu³⁺-doped 13-93 bioactive glass fiber degradation investigates the degradation rate using luminescence monitoring. The investigation of neural networks for temperature and relative humidity measurement with Rayleigh scattering-based distributed optical fiber sensors evaluates neural networks for processing sensor data. The effect of CO₂ laser-induced crystallization on ErF₃-doped tellurite-germanate oxy-fluoride glass examines structural and luminescent enhancements induced by CO₂ laser irradiation. Enhanced sensitivity of absorption spectroscopy glucose detection by machine learning shows the effectiveness of UV-VIS spectroscopy and machine learning in detecting low glucose concentrations in urine samples. Machine learning-enhanced optical fiber sensors for detection of low glucose concentration in samples mimicking tissue present an optical fiber sensor enhanced by machine learning for accurate detection of low glucose concentrations. Investigation of the luminescent properties of SiLiZn glass-ceramic phosphor doped Cr³⁺/Cr⁴⁺ explores the development of Cr²O₃-doped glass-ceramic phosphors for broadband NIR emission, targeting applications in NIR pc-LEDs. Broadband emission in the near-infrared range in glasses doped with PbS quantum dots and Er³⁺ ions showcases borosilicate glasses co-doped with PbS quantum dots and Er³⁺ ions for broadband NIR luminescence. Finally, the ratiometric optical laser power sensor based on a polymer luminescent nanocomposite presents a ratiometric optical laser power sensor using a polymer luminescent nanocomposite for inexpensive laser monitoring systems.

In addition, two other papers are included in the issue. The paper on the near-infrared image-based method for vision enhancement in monitoring the structure and emission character of operating phosphor-converted white light-emitting diodes (pcW-LEDs) demonstrates how incorporating infrared filters significantly improves the observation of pcW-LEDs during operation, reducing glare and enhancing emission efficiency evaluation. The second paper, reconceiving impedance matching and mismatching to mitigate bias-drift in insertion loss of liquid crystal phase delay lines, proposes a novel hardware approach to address amplitude imbalance in phased array antenna feed systems, thereby reducing performance degradation and maintenance costs without relying on conventional amplifiers or attenuators.

Published: 2025-03-31

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