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Luc Thévenaz

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Publications associées (373)

Observation of Brillouin linewidth broadening and decay time in photonic crystal fiber

Luc Thévenaz, Stella Foaleng Mafang

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

IEEE2010

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

Luc Thévenaz, Stella Foaleng Mafang

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

Simplex-coded BOTDA fiber sensor with 1 m spatial resolution over a 50 km range

Luc Thévenaz, Marcelo Alfonso Soto Hernandez

In this Letter, we propose the use of optical pulse coding techniques for long-range distributed sensors based on Brillouin optical time-domain analysis (BOTDA). Compared to conventional BOTDA sensors, optical coding provides a significant sensing-range en ...

Optical Society of America2010

True Time Reversal through Dynamic Brillouin Gratings in Polarization Maintaining Fibers

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

A novel technique to realize true time reversal of an optical signal, using dynamic Brillouin gratings in high-birefringence fibers, is proposed. A data sequence of optical pulses with 2-ns duration was efficiently time-reversed. A numerical simulation of ...

2010

Advanced Brillouin-based distributed optical fibre sensors with sub-meter scale spatial resolution

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

Classical configurations of Brillouin distributed optical fibre sensors show a spatial resolution limited by the phonon lifetime to 1 meter. Novel approaches can substantially overcome this limit through the prior activation of the acoustic wave. ...

IEEE2010

Broadband true time delay for microwave signal processing, using slow light based on stimulated Brillouin scattering in optical fibers

Luc Thévenaz, Sang Hoon Chin

We experimentally demonstrate a novel technique to process broadband microwave signals, using all-optically tunable true time delay in optical fibers. The configuration to achieve true time delay basically consists of two main stages: photonic RF phase shi ...

Optical Society of America2010

On-chip stimulated Brillouin scattering

Luc Thévenaz

We report the first demonstration of on-chip stimulated Brillouin scattering (SBS) with low average power. The measured Brillouin shift and line width are ∼7.7 GHz and ∼6 MHz in a 7 cm long chalcogenide waveguide. ...

2010

“Slow Light” in stimulated Brillouin scattering: on the influence of the spectral width of pump radiation on the group index: Comment

Luc Thévenaz

In a recent paper by Kovalev et al [Optics Express 17, 17317 (2009)] the coupled equations describing stimulated Brillouin scattering (SBS) were solved in the Fourier domain. The main conclusion driven by the authors was that SBS pump spectral broadening w ...

Optical Society of America2010

Brillouin distributed time-domain sensing in optical fibers: state of the art and perspectives

Luc Thévenaz

Optical fiber sensors based on stimulated Brillouin scattering have now clearly demonstrated their excellent capability for long-range distributed strain and temperature measurements. The fiber is used as sensing element, and a value for temperature and/or ...

Springer Verlag2010

Impact of self phase modulation on the performance of Brillouin distributed fibre sensors

Luc Thévenaz, Stella Foaleng Mafang

The spectral broadening of the pump pulse through self phase modulation in a time domain distributed Brillouin sensor is demonstrated to have a non-negligible detrimental effect, leading to a doubling of the effective gain linewidth after some 20 km in sta ...

The International Society for Optical Engineering2010

High spatial resolution distributed sensing in optical fibers by Brillouin gain-profile tracing

Luc Thévenaz

A novel BOTDA technique for distributed sensing of the Brillouin frequency in optical fibers with cm-order spatial resolution is proposed. The technique is based upon a simple modulation scheme, requiring only a single long pump pulse for acoustic excitati ...

Optical Society of America2010

Brillouin optical time-domain analysis assisted by second-order Raman amplification

Luc Thévenaz

We propose and experimentally demonstrate a new method to extend the range of Brillouin optical time domain analysis (BOTDA) systems. It exploits the virtual transparency created by second-order Raman pumping in optical fibers. The idea is theoretically an ...

2010

Dynamic Microwave Photonic Filter Using Separate Carrier Tuning Based on Stimulated Brillouin Scattering in Fibers

Luc Thévenaz, Sang Hoon Chin

Dynamic reconfiguration of a microwave photonic filter by tuning its basic delay based on stimulated Brillouin scattering-induced slow light and optical phase shift of the optical carrier is experimentally implemented. The measurements confirm that the fre ...

2010

True Time Reversal via Dynamic Brillouin Gratings in Polarization Maintaining Fibers

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

Optical Society of America2010

Effect of inhomogeneities on backward and forward Brillouin scattering in Photonic Crystal Fibers

Luc Thévenaz

Photonic Crystal Fibers (PCF) play a crucial role for fundamental investigations such as acousto-optical interactions as well as for applications, such as distributed sensors. One limiting factor for these experiments is the fiber inhomogeneity owing to th ...

2010

Analytical modeling of the gas-filling dynamics in photonic crystal fibers

Luc Thévenaz, Isabelle Dicaire

We present useful expressions predicting the filling time of gaseous species inside photonic crystal fibers. Based on the theory of diffusion, this gas-filling model can be applied to any given fiber geometry or length by calculating diffusion coefficients ...

Optical Society of America2010

Optimized conditions for gas light interaction in photonic crystal fibres

Luc Thévenaz, Isabelle Dicaire

This paper presents helpful expressions predicting the filling time of gaseous species inside photonic crystal fibres. Based on the theory of diffusion, our gas-filling model can be applied to any given fibre geometry or length by calculating diffusion coe ...

The International Society for Optical Engineering2010

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

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

Photonic delay line for broadband optical signals, based on dynamic grating reflectors in fibers

Luc Thévenaz, Sang Hoon Chin, Nikolay Primerov

We experimentally demonstrate that a novel type of photonic delay line based on movable dynamic grating reflectors generated in polarization maintaining fibers can provide continuously tunable signal delaying for high capacity optical data streams and wide ...

IEEE2010

High spatial and spectral resolution long-range sensing using Brillouin echoes

Luc Thévenaz, Stella Foaleng Mafang

High spatial (~cm) and spectral (~MHz) resolution Brillouin sensing is realized with enhanced signal to noise ratio using a pre-activated acoustic field and an optical phase control over the interrogating pulse. Pre-activation of the acoustic field preserv ...

IEEE Institute of Electrical and Electronics Engineers2010

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