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Luc Thévenaz

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Related publications (373)

Page 3 of 19

Towards a novel "silky" way to detect chemical species using spider threads

Luc Thévenaz, Kenny Hey Tow, Isabelle Dicaire, Desmond Chow Ming Chia

Silk possesses extraordinary properties that scientists are currently working hard on harnessing. Amongst them, this primeval material has shown early potential of having excellent optical properties. Through a regeneration process, it is possible to obtai ...

2016

Brillouin Distributed Optical Fiber Sensor Based on a Closed-Loop Configuration

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Zhisheng Yang, Desmond Chow Ming Chia

A Brillouin optical time-domain analysis (BOTDA) method based on a closed-loop control system is proposed to track fast variations of the Brillouin frequency shift along the sensing fiber. Whilst the method eliminates the gain spectral scanning, the exact ...

IEEE Institute of Electrical and Electronics Engineers2018

Localized and stationary dynamic gratings via stimulated Brillouin scattering with phase modulated pumps

Luc Thévenaz, Nikolay Primerov

A novel technique for the localization of stimulated Brillouin scattering (SBS) interaction is proposed, analyzed and demonstrated experimentally. The method relies on the phase modulation of two counter-propagating optical waves by a common pseudo-random ...

Optical Society of America2012

Suspended-core fibres as optical gas sensing cells: study and implementation

Luc Thévenaz, Isabelle Dicaire

We have thoroughly studied and modelled many important aspects for the realization of gas-light interactions in suspended-core fibres. The fraction of the optical field propagating in holes could be calculated from the fibre geometry to predict the total a ...

SPIE2009

Variable delay using stationary and localized Brillouin dynamic gratings

Luc Thévenaz, Nikolay Primerov

Reflections from movable, dynamic acoustic gratings in polarization maintaining (PM) fibers are employed in the long variable delay of periodic, isolated pulses. The gratings are introduced by stimulated Brillouin scattering (SBS) interaction between two c ...

Society of Photo-Optical Instrumentation Engineers (SPIE)2012

Time-Domain Distributed Fiber Sensor With 1 cm Spatial Resolution Based on Brillouin Dynamic Grating

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song, Nikolay Primerov

We demonstrate an optical time-domain distributed fiber sensor showing the highest spatial resolution ever reported based on Brillouin dynamic grating in a polarization-maintaining fiber. In our scheme, the acoustic gratings containing the information on t ...

IEEE Institute of Electrical and Electronics Engineers2010

Characterisation of an electrical heating method for metallic-coated optical fibres for distributed sensing applications

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Xin Lu

In several applications a temperature contrast between the sensing fibre and the environment is required to detect changes in the environmental heat capacity. For this purpose the process of electrical heating in metallic-coated fibres is theoretically ana ...

Spie-Int Soc Optical Engineering2016

A kilometre-range distributed relative humidity sensor

Luc Thévenaz, Li Zhang, Kenny Hey Tow, Fan Yang, Tiago Filipe Pimentel Das Neves

Fibre optics sensors have been identified as very good candidates for environmental monitoring inside the silicon detectors operated at CERN’s Large Hadron Collider. In this study, we present the results from the first highly sensitive relative humidity di ...

SPIE2019

Tunable photonic delay lines in optical fibers

Luc Thévenaz, Sang Hoon Chin

A comprehensive overview is presented about optical fiber-based tunable photonic delay lines, which have been steadily developed over the last decade for the realization of all-optically controlled timing functions. The most widely used techniques, such as ...

Wiley-V C H Verlag Gmbh2012

Analytical expression and experimental validation of the Brillouin gain spectral broadening at any sensing spatial resolution

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Mohammad Mehdi Alem Karladani

A novel and simple analytical expression to describe the Brillouin gain spectral broadening as a function of the spatial resolution in time-domain Brillouin distributed fiber sensors is deduced. The proposed model is experimentally validated using a pump-p ...

Ieee2017

Simple technique to achieve fast light in gain regime using Brillouin scattering

Luc Thévenaz, Sang Hoon Chin

We describe a novel technique based on stimulated Brillouin scattering for propagating fast light (signal advancement) with low distortion in optical fibers. The essence of the technique relies on the presence of two separate gain resonances in the Brillou ...

2007

Enhanced response in Brillouin distributed optical fibre sensors by simultaneous time and frequency pump multiplexing

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Li Zhang, Liang Zhang

A technique to enhance the response of Brillouin distributed sensors is proposed and experimentally validated. The method consists in creating a multi-frequency pump pulse interacting with a multi-frequency continuous-wave probe. The power of each pulse at ...

SPIE2014

Tunable and reconfigurable multi-tap microwave photonic filter based on dynamic Brillouin gratings in fibers

Luc Thévenaz, Sang Hoon Chin, Nikolay Primerov

We propose and experimentally demonstrate new architectures to realize multi-tap microwave photonic filters, based on the generation of a single or multiple dynamic Brillouin gratings in polarization maintaining fibers. The spectral range and selectivity o ...

Optical Society of America2012

Modeling and evaluating the performance of Brillouin distributed optical fiber sensors

Luc Thévenaz, Marcelo Alfonso Soto Hernandez

A thorough analysis of the key factors impacting on the performance of Brillouin distributed optical fiber sensors is presented. An analytical expression is derived to estimate the error on the determination of the Brillouin peak gain frequency, based for ...

Optical Society of America2013

Polarization Pulling in Dual-Probe Distributed Brillouin Optical Fiber Sensors

Luc Thévenaz

This paper investigates the so-far unexplored influence of the probes on the state of polarization (SOP) of the pump pulse in a distributed fiber sensor based on dual-probe Brillouin optical-time domain analysis (BOTDA). A theoretical framework, based on a ...

IEEE Institute of Electrical and Electronics Engineers2024

Design rules for optimizing unipolar coded Brillouin optical time-domain analyzers

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Zhisheng Yang, Simon Adrien Zaslawski

The performance of unipolar unicolor coded Brillouin optical time-domain analysis (BOTDA) is evaluated based on both Simplex and Golay codes. Four major detrimental factors that limit the system performance, including decoded-gain trace distortion, coding ...

2018

Long-range and high-resolution distributed Brillouin fiber sensors | Capteur Brillouin réparti à fibre optique à haute résolution et longue portée

Luc Thévenaz

Brillouin-based distributed optical fiber sensors have been the subject of intense research in recent years because they offer a unique solution for continuous, real-time monitoring in civil engineering and petroleum industry. These sensors provide strain ...

2013

Waveguide and Gas: the Advent of a New Tool for Photonics

Luc Thévenaz, Flavien Gyger, Fan Yang

The realisation of hollow-core fibres and nano-waveguides offers a unique opportunity to optimise the interactions between light and a gaseous medium. Stimulated Brillouin scattering is exploited to achieve unprecedented levels of amplification and to real ...

IEEE2021

Roadmap on Optical Sensors

Lei Zhang, Luc Thévenaz

Optical sensors and sensing technologies are playing a more and more important role in our modern world. From micro-probes to large devices used in such diverse areas like medical diagnosis, defense, monitoring of industrial and environmental conditions, o ...

2023

Polarization pulling in Brillouin fiber sensing using orthogonal probes

Luc Thévenaz

While birefringence-induced polarization fading in dual-probe Brillouin optical time-domain analysis has been demonstrated to be mitigated by using sub-mW orthogonally polarized probes, this work investigates consequences of using stronger probes. Experime ...

SPIE2025