D. Kinet

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Optical power-based interrogation of plasmonic tilted fiber Bragg grating biosensors

25th International Conference on Optical Fiber Sensors, 2017

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FBG-based smart textiles for continuous monitoring of respiratory movements for healthcare applications

The 12th IEEE International Conference on e-Health Networking, Applications and Services, 2010

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OFSETH: A breathing motions monitoring system for patients under MRI

2010 Annual International Conference of the IEEE Engineering in Medicine and Biology, 2010

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$Research paper thumbnail of Refractive index sensors based on optical fiber hetero-core structures and Fabry-Pérot interferometers$

Refractive index sensors based on optical fiber hetero-core structures and Fabry-Pérot interferometers

Fifth European Workshop on Optical Fibre Sensors, 2013

ABSTRACT

Recent progress in passively stabilized single-frequency Brillouin fiber lasers with doubly-resonant cavities

2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, 2013

ABSTRACT Single longitudinal mode (SLM) fiber lasers have attracted interest due to many applicat... more ABSTRACT Single longitudinal mode (SLM) fiber lasers have attracted interest due to many applications in optical fiber sensing and fiber optical communication. Among SLM fiber lasers, Brillouin lasers with doubly-resonant cavity demonstrate low threshold, low intensity noise and perfect spectral performance. Such lasers employ a short ring cavity that has to be simultaneously resonant for the pump and Stokes waves. For stabilization of such lasers against environment noise two tasks have to be solved: 1) to lock the generated pump radiation to the frequency of one of the cavity modes; 2) to adjust the ring cavity length such that the Brillouin frequency shift for the locked pump frequency be exactly equal to an integer number of the ring cavity mode spacing.Here we report two recent and completely passive solutions enabling perfect stabilization of the Brillouin lasers with doubly-resonant cavities. In our experiments (Fig.1), the first laser configuration is stabilized through self-injection locking mechanism [1] implemented to the laser cavity with DFB laser diode used as a pump. The second configuration employs a nonlinear narrow-band mirror based on population inversion dynamical gratings induced in low-absorbed Er-doped fiber [2]. In both cases, once the pump laser gets a resonance with the ring laser cavity mode, the growing optical feedback to the DFB diode in the first case or nonlinear mirror reflectivity in the second case push the pump laser to operate the ring resonance frequency with the linewidth -500Hz. After such locking any slow detuning of the cavity resonance caused, for example, by temperature variations is compensated by the corresponding detuning of the pump operating wavelength. In order to adapt the cavity for operation in the second resonance, i.e. in resonance with the Stokes wave, the ring cavity length was adjusted employing the algorithm recently reported in Ref. [3]. After this adjustment, the pump wave radiation becomes locked to the ring cavi- y mode and causes efficient generation of a single Brillouin cavity mode wave.Pump-to-Stokes conversion efficiency up to -40% and Stokes linewidths &lt;;500Hz and &lt;; 100Hz measured through self-heterodyne technique have been successfully achieved in the experiment with first and second laser configuration, respectively. Dynamical Stokes power behaviors are similar in both configurations. Stable power generation is observed during time intervals of several seconds and could be interrupted by short-time jumping provoked by extended external perturbations. The physical mechanism behind such lasers behavior, the ways of further system stabilization and corresponding results will be discussed on the presentation. This research was supported by the European FEDER-Wallonia “Mediatic” and FP7 IRSES projects, the Interuniversity Attraction Pole program VII/35 of the Belgian Science Policy and programs of Russian Federal Agency on Science and Innovation.

In-line quasi-distributed sensor interrogated by a wavelength tunable narrow band reflectometric technique

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009

This article demonstrates a simple experiment based on a proper design of fiber Bragg gratings th... more This article demonstrates a simple experiment based on a proper design of fiber Bragg gratings that can be used for quasi-distributed sensing purposes. Results show that the demodulation technique, which utilized a commercial optical time-domain reflectometer and some passive components, is cost-effective and offers good accuracy. A good correlation is also obtained with a reference spectrum.

OFSETH: smart medical textile for continuous monitoring of respiratory motions under magnetic resonance imaging

Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2009

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Optical fibre sensors embedded into technical textile for a continuous monitoring of patients under Magnetic Resonance Imaging

Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2008

Temperature and strain effects discrimination inside composite materials with embedded weakly tilted fibre Bragg grating

Fifth European Workshop on Optical Fibre Sensors, 2013

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<title>Kerr effect in structured superluminal media</title>

Advances in Slow and Fast Light V, 2012

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OFSETH: optical technologies embedded in smart medical textile for continuous monitoring of respiratory motions under magnetic resonance imaging

SPIE Proceedings, 2010

The potential impact of optical fiber sensors embedded into medical textiles for the continuous m... more The potential impact of optical fiber sensors embedded into medical textiles for the continuous monitoring of the patient during Magnetic Resonance Imaging (MRI) is now proved. We report how two pure optical technologies can successfully sense textile elongation between, 0% and 3%, while maintaining the stretching properties of the textile substrates for a good comfort of the patient. Investigating influence of different patients' morphology as well as textile integration issues to let free all vitals organs for medical staff actions, the OFSETH harness allows a continuous measurement of respiration movements. For example, anaesthesia for MRI examination uses the same drugs as for any surgical procedure. Even if spontaneous respiration can be preserved most of the time, spontaneous respiration is constantly at risk of being impaired by anaesthetic drugs or by upper airway obstruction. Monitoring of the breathing activity is needed to assess adequate ventilation or to detect specific obstruction patterns. Moreover artefacts due to physiological motions induce a blooming effect on the MRI result. The use of synchronisation devices allows reducing these effects. Positioned at certain strategic places according to the investigated organ, the presented sensors could constitute an efficient and adapted solution for respiratory synchronisation of the MRI acquisition.

Smart medical textiles with embedded optical fibre sensors for continuous monitoring of respiratory movements during MRI

SPIE Proceedings, 2010

ABSTRACT We report on three respiration sensors based on pure optical technologies developed duri... more ABSTRACT We report on three respiration sensors based on pure optical technologies developed during the FP6 EU project OFSETH. The developed smart medical textiles can sense elongation up to 3%, while maintaining the stretching properties of the textile substrates for a good comfort of the patient. The sensors, based on silica and polymer fibre, are developed for monitoring of patients during MRI examination. The OFSETH harness allows a continuous measurement of respiration movements while all vitals organs are free for medical staff actions. The sensors were tested in MRI environment and on healthy adults.

Surface plasmon resonance in eccentric femtosecond-laser-induced fiber Bragg gratings

Optics Letters, 2014

Highly localized refractive index modulations are photo-written in the core of pure silica fiber ... more Highly localized refractive index modulations are photo-written in the core of pure silica fiber using point-by-point focused UV femtosecond pulses. These specific gratings exhibit a comb-like transmitted amplitude spectrum, with polarization-dependent narrowband cladding mode resonances. In this work, eccentric gratings are surrounded by a gold sheath, allowing the excitation of surface plasmon polaritons (SPP) for radially-polarized light modes. The spectral response is studied as a function of the surrounding refractive index and a maximum sensitivity of 50 nm/RIU (refractive index unit) is reported for a well-defined cladding-mode resonance among the spectral comb. This novel kind of plasmonic fiber grating sensor offers rapidity of production, design flexibility, and high temperature stability.

<title>Self-referenced wavelength-sensitive monitoring technique for quasi-distributed fiber Bragg gratings sensors</title>

Fourth European Workshop on Optical Fibre Sensors, 2010

In this work, we demonstrate the operating principle of a quasi-distributed monitoring system bas... more In this work, we demonstrate the operating principle of a quasi-distributed monitoring system based on the concatenation of identical low reflective fiber Bragg gratings (FBGs) interrogated by means of an optical time domain reflectometer (OTDR). A filter inserted between the OTDR and the FBGs allows the height of the FBG reflection peaks in the OTDR trace to depend on their

Vibration sensor based on highly birefringent Bragg gratings written in standard optical fiber by a femtosecond laser

SPIE Proceedings, 2014

We present a vibration sensor based on highly birefringent fiber Bragg gratings written in standa... more We present a vibration sensor based on highly birefringent fiber Bragg gratings written in standard single mode optical fiber and realized with UV femtosecond pulses. This vibration sensor takes advantage of the stress-induced phase shift between the two orthogonally polarized fiber eigenmodes which induces intensity distribution changes in the two fiber Bragg grating reflection modes. The gratings are inscribed with the femtosecond line by line technique and have a birefringence value of 6 10-4. We demonstrate that theses gratings are temperature birefringence insensitive and ideal for vibration measurements.

Fiber Bragg Grating Sensors toward Structural Health Monitoring in Composite Materials: Challenges and Solutions

Sensors, 2014

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A single-longitudinal-mode Brillouin fiber laser passively stabilized at the pump resonance frequency with a dynamic population inversion grating

Laser Physics Letters, 2012

We demonstrate a single-longitudinal-mode Brillouin ring fiber laser passively stabilized at the ... more We demonstrate a single-longitudinal-mode Brillouin ring fiber laser passively stabilized at the resonance frequency with a 1.7 m section that is an unpumped polarization-maintaining erbium-doped fiber. The two coupled all-fiber Fabry–Perot interferometers that comprise the cavity, in combination with the dynamical population inversion gratings self-induced in the active fiber, provide adaptive pump-mode selection and Stokes wave generation at the same time. The laser is shown to emit a single-frequency Stokes wave with a linewidth narrower than 100 Hz.

Gamma Radiation Induced Short-Wavelength Shift of the Bragg Peak in Type I Fiber Gratings

IEEE Transactions on Nuclear Science, 2010

ABSTRACT We have studied the gamma-radiation induced effect on the Bragg peak position in fiber g... more ABSTRACT We have studied the gamma-radiation induced effect on the Bragg peak position in fiber gratings. For the first time, to the best of our knowledge, a short-wavelength shift was observed for the Type I gratings written in an intrinsically photosensitive fiber. Based on the kinetics of the peak shift observed under irradiation and during post-irradiation annealing, we propose that two different types of defects are generated by ionizing radiation. One type is responsible for the refractive index increase during irradiation, while the creation of the defects of another type results in the index decrease. The concurrence of the two types of defects can be a way to obtain high stability of the gratings under irradiation.

Optical Fiber Sensors Embedded Into Medical Textiles for Healthcare Monitoring

IEEE Sensors Journal, 2008

... Available: http://www.ofseth.org [4] J. De Jonckheere, M. Jeanne, A. Grillet, S. Weber, P. Ch... more

Medical Textiles With Embedded Fiber Optic Sensors for Monitoring of Respiratory Movement

IEEE Sensors Journal, 2012

For patients under Magnetic Resonance Imaging (MRI) spontaneous respiration is constantly at risk... more For patients under Magnetic Resonance Imaging (MRI) spontaneous respiration is constantly at risk of being impaired by anesthetic drugs or by upper airway obstruction. Therefore, continuous monitoring of the breathing activity is needed to assess adequate ventilation or to detect specific ob- struction patterns. The paper describes three MRI compatible respiration sensors based on pure optical technologies developed within the

Optical power-based interrogation of plasmonic tilted fiber Bragg grating biosensors

25th International Conference on Optical Fiber Sensors, 2017

Download

FBG-based smart textiles for continuous monitoring of respiratory movements for healthcare applications

The 12th IEEE International Conference on e-Health Networking, Applications and Services, 2010

Download

OFSETH: A breathing motions monitoring system for patients under MRI

2010 Annual International Conference of the IEEE Engineering in Medicine and Biology, 2010

Download

$Research paper thumbnail of Refractive index sensors based on optical fiber hetero-core structures and Fabry-Pérot interferometers$

Refractive index sensors based on optical fiber hetero-core structures and Fabry-Pérot interferometers

Fifth European Workshop on Optical Fibre Sensors, 2013

ABSTRACT

Recent progress in passively stabilized single-frequency Brillouin fiber lasers with doubly-resonant cavities

2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, 2013

In-line quasi-distributed sensor interrogated by a wavelength tunable narrow band reflectometric technique

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009

OFSETH: smart medical textile for continuous monitoring of respiratory motions under magnetic resonance imaging

Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2009

Download

Optical fibre sensors embedded into technical textile for a continuous monitoring of patients under Magnetic Resonance Imaging

Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2008