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Papers by Tomasz Nasiłowski

Optics Express

The possibility to perform distributed measurements of the effective refractive index difference ... more The possibility to perform distributed measurements of the effective refractive index difference between distinct modes in few mode optical fibers is demonstrated using phase sensitive optical time domain reflectometry. Effective refractive index differences between LP02, LP21a and LP21b modes are measured with for a spatial resolution of 24m.

25th International Conference on Optical Fiber Sensors, 2017

CO2 optical fiber sensors based on polymer active materials are presented in this paper. Ethyl ce... more CO2 optical fiber sensors based on polymer active materials are presented in this paper. Ethyl cellulose was proven to be a good candidate for a matrix material of the sensor, since it gives porous, thick and very sensitive layers. Low-cost sensors based on polymer optical fibers have been elaborated. Sensors have been examined for their sensitivity to CO2, temperature and humidity. Response time during cyclic exposures to CO2 have been also determined. Special layers exhibiting irreversible change of color during exposure to carbon dioxide have been developed. They have been verified for a possible use in smart food packaging.

Optical Fiber Sensors Conference 2020 Special Edition, 2021

Optical Fiber Communication Conference

We demonstrate a silicon photonic 4×1 TTD beamformer operated in real-time. Beamforming of a 1 Gb... more We demonstrate a silicon photonic 4×1 TTD beamformer operated in real-time. Beamforming of a 1 Gb/s QPSK signal carried at 28 GHz was validated by a fourfold improvement in output amplitude and EVM.

26th International Conference on Optical Fiber Sensors, 2018

In this paper we discuss optical fiber sensors protected by metal coatings and their industrial a... more In this paper we discuss optical fiber sensors protected by metal coatings and their industrial applications. In particular, we focus on gold-coated temperature sensor for application in temperature up to 900°C based on dual-core fiber.

The Radio astronomy community is entering a new era with the Square Kilometre Array (SKA), a tele... more The Radio astronomy community is entering a new era with the Square Kilometre Array (SKA), a telescope with 100 times improved sensitivity and a 10.000 fold survey speed compared to existing radio telescopes. For this instrument, new technologies are required for telescope design, data transport, computing and software. In particular, new technologies are being investigated to replace the classic parabolic dish with electronically steered antennas, the so-called phased arrays. Beam forming of these very large arrays, with up to 100 million elements, is an important component of the telescope. Photonic beamforming is of particular interest, due to the potential for miniaturization, high capacity and lower power consumption. The recently closed European funded project BEACON made important state of the art advances regarding photonic beamforming, which are reported on this paper.

Nowadays technology allows to create highly effective Intruder Detection Systems (IDS), that are ... more Nowadays technology allows to create highly effective Intruder Detection Systems (IDS), that are able to detect the presence of an intruder within a defined area. In such systems the best performance can be achieved by combining different detection techniques in one system. One group of devices that can be applied in an IDS, are devices based on Fiber Optic Sensors (FOS). The FOS benefits from numerous advantages of optical fibers like: small size, light weight or high sensitivity. In this work we present a novel Microstructured Optical Fiber (MOF) characterized by increased strain sensitivity dedicated to distributed acoustic sensing for intelligent intruder detection systems. By designing the MOF with large air holes in close proximity to a fiber core, we increased the effective refractive index sensitivity to longitudinal strain. The presented fiber can be easily integrated in a floor system in order to detect any movement in the investigated area. We believe that sensors, based ...

L'invention porte sur un capteur de gaz a fibre optique et sur son procede de fabrication. Le... more L'invention porte sur un capteur de gaz a fibre optique et sur son procede de fabrication. Le capteur de gaz a fibre optique est constitue d'au moins une fibre optique revetue d'une couche de gel de silice qui change de couleur avec un changement de la concentration des gaz, tels que le dioxyde de carbone (CO 2 ), le dioxyde d'azote (NO 2 ), le dioxyde de soufre (SO 2 ), l'ammoniac (NH 3 ) et l'eau (H 2 O), la couche de gel de silice etant appliquee sur une surface de fibre optique denudee et contenant au moins une substance indicatrice, telle que le rouge de phenol ou le bleu de thymol, sensible a un changement du pH dans l'environnement de travail de la fibre optique dans une plage allant de 0 a 14 et la substance indicatrice etant placee sur une surface de la fibre optique traitee preparee dans le procede de taillage en pointe, de gravure, de pliage ou de coupe. Le procede de fabrication du capteur de gaz a fibre optique consiste a denuder une fibre op...

Fiber optic sensors (FOS) are insensitive to external EM fields and are intrinsically safe (as no... more Fiber optic sensors (FOS) are insensitive to external EM fields and are intrinsically safe (as no electrical power is needed at the sensing point), so the measurement can be performed in areas where standard electronic devices cannot easily be applied. What is more, due to the very low silica fiber attenuation the measurement point can be located kilometers away from a light source and detector, which makes the sensors independent of a local power source. Furthermore the FOS are small so they can be used for sensing in mechanical mechanisms where there is not much free space. They can also be easily integrated with the structure of different materials for military applications (e.g. in tanks and airplanes). In this work we propose an intrinsically safe temperature sensor based on fiber optic technology. The presented sensor is entirely passive and benefits from all of the advantages mentioned above, which allows it to be applied in the most demanding environments. The construction o...

Journal of Lightwave Technology, 2020

Optical Fiber Sensors Conference 2020 Special Edition, 2021

Optics Express, 2021

In this work, a compact all-fiber bend sensor based on a dual-core microstructured optical fiber ... more In this work, a compact all-fiber bend sensor based on a dual-core microstructured optical fiber has been manufactured and characterized. The sensor relies on the unbalanced Michelson interferometric technique realized by attaching a piece of silica fiber to one of the fiber cores acting as the unbalancing element. Three probes with different lengths of the unbalancing element have been experimentally tested for sensitivity tailoring analysis. Additionally, a theoretical model has been developed for comparison and verification of the results. Good linear behavior of the spectral shift with bend has been measured and it has been proven that the sensitivity of the sensor depends on the length of the unbalancing element and the orientation of the cores. Higher sensitivities are achieved for shorter lengths of the unbalancing element and orientation of the core axis parallel to the bend direction. The highest sensitivity reported is 9.97 pm/µm for the case of 34 µm of unbalancing element and orientation of 0 degrees.

Nature Communications, 2019

Biosensors & bioelectronics, Jan 30, 2018

An optical fiber interferometric microprobe for detection of specific proteins is presented in th... more An optical fiber interferometric microprobe for detection of specific proteins is presented in this paper. The microprobe is an all-fiber device, which is based on Michelson interferometer configuration, which allows for detection of protein antigens in an analyzed solution thanks to antibodies immobilized on the sensor surface. The interferometer is made of dual core fiber and has a precisely formed arm length difference, achieved by splicing a fragment of polarization maintaining fiber to one of the cores. An all-fiber configuration of the sensor decreases substantially cross-sensitivities to temperature and deformation in comparison to other optical fiber interferometers. Reported sensor has a sensing region on the tip of the interferometer and therefore may be used for point measurements in medicine. The immunosensor and optical measuring system are designed to utilize the most common broadband light sources that operate at a central wavelength of 1.55 µm. The results show that ...

Optical Fiber Technology, 2017

Acta Physica Polonica A, 1999

Optics Express

The possibility to perform distributed measurements of the effective refractive index difference ... more The possibility to perform distributed measurements of the effective refractive index difference between distinct modes in few mode optical fibers is demonstrated using phase sensitive optical time domain reflectometry. Effective refractive index differences between LP02, LP21a and LP21b modes are measured with for a spatial resolution of 24m.

25th International Conference on Optical Fiber Sensors, 2017

CO2 optical fiber sensors based on polymer active materials are presented in this paper. Ethyl ce... more CO2 optical fiber sensors based on polymer active materials are presented in this paper. Ethyl cellulose was proven to be a good candidate for a matrix material of the sensor, since it gives porous, thick and very sensitive layers. Low-cost sensors based on polymer optical fibers have been elaborated. Sensors have been examined for their sensitivity to CO2, temperature and humidity. Response time during cyclic exposures to CO2 have been also determined. Special layers exhibiting irreversible change of color during exposure to carbon dioxide have been developed. They have been verified for a possible use in smart food packaging.

Optical Fiber Sensors Conference 2020 Special Edition, 2021

Optical Fiber Communication Conference

We demonstrate a silicon photonic 4×1 TTD beamformer operated in real-time. Beamforming of a 1 Gb... more We demonstrate a silicon photonic 4×1 TTD beamformer operated in real-time. Beamforming of a 1 Gb/s QPSK signal carried at 28 GHz was validated by a fourfold improvement in output amplitude and EVM.

26th International Conference on Optical Fiber Sensors, 2018

In this paper we discuss optical fiber sensors protected by metal coatings and their industrial a... more In this paper we discuss optical fiber sensors protected by metal coatings and their industrial applications. In particular, we focus on gold-coated temperature sensor for application in temperature up to 900°C based on dual-core fiber.

The Radio astronomy community is entering a new era with the Square Kilometre Array (SKA), a tele... more The Radio astronomy community is entering a new era with the Square Kilometre Array (SKA), a telescope with 100 times improved sensitivity and a 10.000 fold survey speed compared to existing radio telescopes. For this instrument, new technologies are required for telescope design, data transport, computing and software. In particular, new technologies are being investigated to replace the classic parabolic dish with electronically steered antennas, the so-called phased arrays. Beam forming of these very large arrays, with up to 100 million elements, is an important component of the telescope. Photonic beamforming is of particular interest, due to the potential for miniaturization, high capacity and lower power consumption. The recently closed European funded project BEACON made important state of the art advances regarding photonic beamforming, which are reported on this paper.

Nowadays technology allows to create highly effective Intruder Detection Systems (IDS), that are ... more Nowadays technology allows to create highly effective Intruder Detection Systems (IDS), that are able to detect the presence of an intruder within a defined area. In such systems the best performance can be achieved by combining different detection techniques in one system. One group of devices that can be applied in an IDS, are devices based on Fiber Optic Sensors (FOS). The FOS benefits from numerous advantages of optical fibers like: small size, light weight or high sensitivity. In this work we present a novel Microstructured Optical Fiber (MOF) characterized by increased strain sensitivity dedicated to distributed acoustic sensing for intelligent intruder detection systems. By designing the MOF with large air holes in close proximity to a fiber core, we increased the effective refractive index sensitivity to longitudinal strain. The presented fiber can be easily integrated in a floor system in order to detect any movement in the investigated area. We believe that sensors, based ...

L'invention porte sur un capteur de gaz a fibre optique et sur son procede de fabrication. Le... more L'invention porte sur un capteur de gaz a fibre optique et sur son procede de fabrication. Le capteur de gaz a fibre optique est constitue d'au moins une fibre optique revetue d'une couche de gel de silice qui change de couleur avec un changement de la concentration des gaz, tels que le dioxyde de carbone (CO 2 ), le dioxyde d'azote (NO 2 ), le dioxyde de soufre (SO 2 ), l'ammoniac (NH 3 ) et l'eau (H 2 O), la couche de gel de silice etant appliquee sur une surface de fibre optique denudee et contenant au moins une substance indicatrice, telle que le rouge de phenol ou le bleu de thymol, sensible a un changement du pH dans l'environnement de travail de la fibre optique dans une plage allant de 0 a 14 et la substance indicatrice etant placee sur une surface de la fibre optique traitee preparee dans le procede de taillage en pointe, de gravure, de pliage ou de coupe. Le procede de fabrication du capteur de gaz a fibre optique consiste a denuder une fibre op...

Fiber optic sensors (FOS) are insensitive to external EM fields and are intrinsically safe (as no... more Fiber optic sensors (FOS) are insensitive to external EM fields and are intrinsically safe (as no electrical power is needed at the sensing point), so the measurement can be performed in areas where standard electronic devices cannot easily be applied. What is more, due to the very low silica fiber attenuation the measurement point can be located kilometers away from a light source and detector, which makes the sensors independent of a local power source. Furthermore the FOS are small so they can be used for sensing in mechanical mechanisms where there is not much free space. They can also be easily integrated with the structure of different materials for military applications (e.g. in tanks and airplanes). In this work we propose an intrinsically safe temperature sensor based on fiber optic technology. The presented sensor is entirely passive and benefits from all of the advantages mentioned above, which allows it to be applied in the most demanding environments. The construction o...

Journal of Lightwave Technology, 2020

Optical Fiber Sensors Conference 2020 Special Edition, 2021

Optics Express, 2021

In this work, a compact all-fiber bend sensor based on a dual-core microstructured optical fiber ... more In this work, a compact all-fiber bend sensor based on a dual-core microstructured optical fiber has been manufactured and characterized. The sensor relies on the unbalanced Michelson interferometric technique realized by attaching a piece of silica fiber to one of the fiber cores acting as the unbalancing element. Three probes with different lengths of the unbalancing element have been experimentally tested for sensitivity tailoring analysis. Additionally, a theoretical model has been developed for comparison and verification of the results. Good linear behavior of the spectral shift with bend has been measured and it has been proven that the sensitivity of the sensor depends on the length of the unbalancing element and the orientation of the cores. Higher sensitivities are achieved for shorter lengths of the unbalancing element and orientation of the core axis parallel to the bend direction. The highest sensitivity reported is 9.97 pm/µm for the case of 34 µm of unbalancing element and orientation of 0 degrees.

Nature Communications, 2019

Biosensors & bioelectronics, Jan 30, 2018

An optical fiber interferometric microprobe for detection of specific proteins is presented in th... more An optical fiber interferometric microprobe for detection of specific proteins is presented in this paper. The microprobe is an all-fiber device, which is based on Michelson interferometer configuration, which allows for detection of protein antigens in an analyzed solution thanks to antibodies immobilized on the sensor surface. The interferometer is made of dual core fiber and has a precisely formed arm length difference, achieved by splicing a fragment of polarization maintaining fiber to one of the cores. An all-fiber configuration of the sensor decreases substantially cross-sensitivities to temperature and deformation in comparison to other optical fiber interferometers. Reported sensor has a sensing region on the tip of the interferometer and therefore may be used for point measurements in medicine. The immunosensor and optical measuring system are designed to utilize the most common broadband light sources that operate at a central wavelength of 1.55 µm. The results show that ...

Optical Fiber Technology, 2017

Acta Physica Polonica A, 1999