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Luc Thévenaz

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Related publications (373)

Page 9 of 19

Slow and Fast Light in Optical Fibers: Review and Perspectives

Luc Thévenaz

Fiber slow light systems are at a turning point moving from a laboratory research to real applications. The possibility to shape the spectral resonance in Brillouin slow light leads to optimized configurations and innovative solutions. ...

Optical Society of America2009

Time and frequency pump-probe multiplexing to enhance the signal response of Brillouin optical time-domain analyzers

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Li Zhang

A technique to enhance the response and performance of Brillouin distributed fiber sensors is proposed and experimentally validated. The method consists in creating a multi-frequency pump pulse interacting with a matching multi-frequency continuous-wave pr ...

Optical Society of America2014

Distributed sensing employing stimulated Brillouin scattering in optical fibers

Luc Thévenaz

Disclosed are methods and devices for distributed sensing of a measurable parameter employing stimulated Brillouin scattering in an optical fiber. A frequency-modulated or phase-modulated light wave is transmitted into the optical fiber. A scattered light ...

World Intellectual Property Organization2012

Slow, superluminal and negative group velocity in optical fibres using stimulated Brillouin scattering

Luc Thévenaz

Active control of the group velocity in optical fibres is demonstrated, allowing long delays, faster-than-light propagation and even negative velocity, for which the peak of a pulse exits the fibre before entering the input end ...

IET2005

Flexible Slow and Fast Light in Optical Fibers

Luc Thévenaz, Sang Hoon Chin, Kwang-Yong Song

A method to achieve an extremely wide and flexible control of the group velocity in an optical fiber using stimulated Brillouin scattering is presented. Group velocities below 71,000 km/s on one hand, well exceeding the speed of light in vacuum on the othe ...

IEEE2006

Distributed Brillouin Fiber Sensor Assisted by First-Order Raman Amplification

Luc Thévenaz

Distributed optical fiber Brillouin sensors provide innovative solutions for the monitoring of temperature and strain in large structures. The effective range of these sensors is typically of the order of 20–30 km, which limits their use in certain ...

IEEE Institute of Electrical and Electronics Engineers2010

Slow Light in Optical Fibers: State-of-the-Art and Perspectives 10 Years After the First Demonstration

Luc Thévenaz

The possibility to directly realize all-optical delay lines in optical fibers has triggered efforts of research during the past decade, with few practical outcomes. The reason is fundamental, caused by the unescapable relation between delay and distortion. ...

IEEE2015

Weaving our way towards a new generation of ﬁbre-optic chemical sensors based on spider silk

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

From the spider’s perspective, silk is not only a building material but also a safety net, a weapon and a sensory organ to detect the presence of preys on its web. Indeed, this primeval material has been shaped over hundreds of millions of years by spiders ...

Ieee2016

Experimental observation of Brillouin linewidth broadening and decay time in photonic crystal fiber

Luc Thévenaz

We present a novel distributed sensing technique that makes possible the observation of Brillouin gain spectral distribution and acoustic decay time in photonic crystal fiber as well as in standard single-mode fiber. ...

IEEE2010

Short spatial resolutions retrieval from a long pulse BOTDA trace

Luc Thévenaz, Zhisheng Yang, Simon Adrien Zaslawski, Sheng Wang

A novel technique is proposed to obtain a flexible and variable spatial resolution from a conventional Brillouin optical time-domain analyzers using a fast post-processing algorithm. The approach is very attractive since a fine spatial resolution can be ob ...

SPIE2019

From Spider Webs to a Biomimetic Optical Fibre Sensor

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

Can we use spider silk threads as natural, biological optical fibre sensors? In this communication, we will see how we can harness the optical properties of spider dragline silk and use it for sensing. ...

2018

Self-Advanced Propagation of Light Pulse in an Optical Fiber Based on Brillouin Scattering

Luc Thévenaz, Sang Hoon Chin

We propose a novel method to realize self-induced fast light and signal advancement with no distinct pump source in optical fibers, based on stimulated Brillouin scattering. This scheme will be helpful for real application systems. ...

OSA2007

Dual-pump sweep-free stimulated Brillouin optical distributed sensing method and device

Luc Thévenaz, Sang Hoon Chin

The present invention concerns a Brillouin optical distributed sensing method, comprising steps of: (i) providing a first and a second optical pulsed pump wave (20, 23) and an optical probe wave comprising at least one probe spectral component (26), (ii) d ...

World Intellectual Property Organization2014

Boosting the performance of distributed optical fiber sensors based on adaptive decoder

Luc Thévenaz, Zhisheng Yang, Simon Adrien Zaslawski, Sheng Wang

An adaptive decoder is proposed to derive the fiber single-pulse response. This experimentally simple technique simultaneously improves the measurement time and the noise level, boosting to an uncommon degree the overall performance of distributed fiber se ...

Optical Society of America2018

Near-infrared laser photoacoustic detection of methane: The impact of molecular relaxation

Luc Thévenaz, Jean-Philippe Besson

A photoacoustic sensor has been developed for trace-gas monitoring using a near-infrared semiconductor laser emitting in the 2ν3 band of methane at 1.65 μm. The apparatus was designed for on-line process control in the manufacturing of the novel low-water- ...

Springer Verlag2006

Opto-acoustic coupling and Brillouin phenomena in microstructure optical fibers

Luc Thévenaz

Like photonic crystals have revolutionized the way of manipulating optical waves at the sub-micron scale, phononic crystals have more recently played similar decisive role for sound waves, or more generally elastic waves. Then, the idea of coupling light a ...

IEEE2012

Extending the Real Remoteness of Long-Range Brillouin Optical Time-Domain Fiber Analyzers

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Sang Hoon Chin

The real remoteness of a distributed optical fiber sensor based on Brillouin optical time-domain analysis is considerably extended in this paper using seeded second-order Raman amplification and optical pulse coding. The presented analysis and the experime ...

IEEE Institute of Electrical and Electronics Engineers2014

Fundamental aspects of linear slow light systems

Luc Thévenaz

In a linear slow light system the delaying process is necessarily inducing distortion for fundamental reasons, strictly bounding the maximum delay-bandwidth product to unity. Slowing the light does not directly enhance light-matter interaction, but is a co ...

City University London2015

Design of simulator for seepage detection in an embankment based on distributed optic fibre sensing technology

Luc Thévenaz

Based on the temperature change in an embankment, a seepage flow simulator and monitoring system based on distributed optical fiber sensing are proposed. A simulator is designed that consists of scale model of embankment with definite length, seepage flow ...

2007

Random-access distributed fiber sensing

Luc Thévenaz, Andrey Denisov, Nikolay Primerov

Optical sensing offers an attractive solution to the societal concern for prevention of natural and human-generated threats and for efficient use of natural resources. The unprecedented properties of optical fibers make them ideal for implementing a ‘nervo ...

Wiley-VCH Verlag Berlin2012