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Luc Thévenaz

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Publications associées (373)

Distributed fiber-optic temperature sensing for hydrologic systems

Luc Thévenaz, Marc Parlange, Wolf Hendrik Huwald, Nicolaas Cornelis van de Giesen

Instruments for distributed fiber-optic measurement of temperature are now available with temperature resolution of 0.01°C and spatial resolution of 1 m with temporal resolution of fractions of a minute along standard fiber-optic cables used for communicat ...

2006

La lumière lente et rapide: une future pièce maîtresse pour la photonique

Luc Thévenaz, Kwang-Yong Song, Sang Hoon Chin

Nous présentons une technique permettant de réaliser un contrôle extensif et très souple de la vitesse de groupe de signaux se propageant dans une fibre optique. Ce contrôle, directement piloté par une source lumineuse, est effectué par le truchement de ga ...

2006

Review and Progress on Distributed Fibre Sensing

Luc Thévenaz

Optical fibers have crucially contributed to promote the concept of distributed sensing with a large impact. The different types of fiber optics distributed sensing techniques are reviewed and their performances and limits are presented. ...

Optical Society of America2006

Mesure distribuée du gain d'un amplificateur paramétrique à fibre optique par rétro-diffusion Brillouin

Luc Thévenaz, Dario Alasia

Nous avons réalisé, pour la première fois à notre connaissance, une mesure distribuée du gain paramétrique d’un amplificateur à fibre optique. La technique repose sur une analyse de la rétrodiffusion Brillouin dans le domaine temporel. Elle a permis de met ...

2006

Broad-bandwidth Brillouin slow light in optical fibers

Luc Thévenaz, Kwang-Yong Song

We experimentally demonstrate that Brillouin slow light with an arbitrary large bandwidth can be readily obtained in conventional optical fibers using a simple and inexpensive pump spectral broadening technique ...

IEEE2006

Fast and Efficient Light Intensity Modulation in SOI with Gate-All-Around Transistor Phase Modulator

Luc Thévenaz, Mihai Adrian Ionescu, Kirsten Emilie Moselund

We report fast modulation (>30 GHz) in a SOI resonant cavity using integrated Bragg mirrors and a gate-all-around transistor as active element. Modulation depth >90% can be obtained in 12.5 μm long devices. ...

IEEE2006

Flexible Slow and Fast Light Using Tailored Brillouin Spectra in Optical Fibers

Luc Thévenaz, Kwang-Yong Song, Sang Hoon Chin

Stimulated Brillouin scattering makes possible the generation of synthesized gain spectra, so that innovative slow light schemes can be realized, ranging from broadband tunable delays to a zero-gain situation identical to an ideal electromagnetically-induc ...

OSA2006

Diode laser frequency stabilisation for water-vapour differential absorption sensing

Luc Thévenaz, Daniela Werner

We describe a low-power continuous-wave laser system for water-vapour sensing applications in the 935-nm region. The system is based on extended-cavity diode lasers and distributed-feedback lasers and delivers four single-mode frequency-stabilised optical ...

Springer Verlag2006

The effects of gamma-radiation on the properties of Brillouin scattering in standard Ge-doped optical fibres

Luc Thévenaz, Dario Alasia, Laura Abrardi

We have experimentally studied the effects of gamma-radiation up to very high total doses on the physical properties of Brillouin scattering in standard commercially available optical fibres. A frequency variation of about 5 MHz for both Brillouin frequenc ...

Institute of Physics2006

Optical Sensor for the Detection of OH- Contamination during Optical Fibre Manufacturing

Luc Thévenaz, Jean-Philippe Besson

Sub-ppm (HCl) and (H2O) monitoring using photoacoustic spectroscopy is reported in optical fibre manufacturing for the production of low-water-peak fibres. Contamination sources of the carrier gas used for fibre preforms manufacturing were identified and d ...

Optical Society of America2006

Highly Efficient Slow and Fast Light Generation via Brillouin Scattering in As2Se3 Chalcogenide Fiber

Luc Thévenaz, Kwang-Yong Song

Delaying and advancement of optical pulses using stimulated Brillouin scattering in As2Se3 fiber is demonstrated. Pulses can be delayed by 37 ns in a 5-m-long fiber with a pump power as low as 60 mW. ...

Optical Society of America2006

Zero-Gain Slow Light in Optical Fibres

Luc Thévenaz, Sang Hoon Chin

Generation of optical delays with minor amplitude change are realized through the superposition of gain and loss profiles generated by stimulated Brillouin scattering. It results in synthesized spectral profiles identical to an ideal electromagnetically-in ...

IEEE2006

Flexible Slow and Fast Light in Optical Fibers

Luc Thévenaz, Kwang-Yong Song, Sang Hoon Chin

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

Simultaneous frequency stabilization of four laser diodes in the 935-nm water vapour spectrum for space application

Luc Thévenaz, Daniela Werner

Connecticut College, New London, Connecticut USA2005

Scaling SOI photonics to micron and sub-micron devices

Luc Thévenaz, Mihai Adrian Ionescu, Kirsten Emilie Moselund, Marco Mazza

SPIE2005

Health Monitoring for Large Structures using Brillouin Distributed Sensing

Luc Thévenaz

2005

Continuous and simultaneous multigas monitoring using a highly sensitive and selective photoacoustic sensor

Luc Thévenaz, Jean-Philippe Besson, Marcel Gyger

A multi-gas photoacoustic sensor is reported. Simultaneous measurement of ammonia, carbon dioxide and water vapor is demonstrated at ppm level using semiconductor lasers. In-situ measurements to control the housing conditions of laboratory animals are pres ...

IEEE2005

Observation of pulse delaying and advancement in optical fibers using stimulated Brillouin scattering

Luc Thévenaz, Kwang-Yong Song

We demonstrate experimentally that it is possible to control optically the group velocity of an optical pulse as it travels along an optical fiber. To achieve this control we use the effect of Stimulated Brillouin Scattering. In our experiments we have ach ...

2005

Methane monitoring by near infrared photoacoustic spectroscopy: The importance of relaxation phenomena

Luc Thévenaz, Jean-Philippe Besson

The importance of molecular relaxation in photoacoustic spectroscopy is discussed. The particular case of methane monitoring in dry oxygen using a 1.65-μm laser-based photoacoustic sensor is reported. The slow vibration-to-translation energy transfer occur ...

2005

Gain-assisted pulse advancement using single and double Brillouin gain peaks in optical fibers

Luc Thévenaz, Kwang-Yong Song

We report the first experimental demonstration of pulse advancement with gain in optical fibers based on stimulated Brillouin scattering. Two experimental configurations are investigated and compared. One is to make the pulse propagate in a region slightly ...

Optical Society of America2005

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