Luc Thévenaz

We demonstrate expeimentally a novel approach for fast light generation based on a wideband compound spectral resonance using stimulated Brillouin scattering. The pulses experience fast light with extremely reduced distortion and small amplitude change. ...

OSA2007

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

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

How to play with the spectral sensitivity of interferometers using slow light concepts and how to do it practically

We describe some interesting features that arise when slow and fast light structures are introduced in interferometers. With different configurations, one can obtain a spectral sensitivity enhancement of the interferometer or an enhanced robustness to lase ...

SPIE2007

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

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

Recent progress in Brillouin distributed fibre sensing

This paper will review some recent progresses related to distributed optical fibre sensing using Brillouin Optical Time-Domain Analysis (BOTDA) towards increased performance in range, resolution and acquisition time. Since optical fibre sensing will certai ...

Nanjing University2007

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

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

Zero-gain slow and fast light propagation in an optical fiber

Slow and fast light with null amplification or loss of a light signal is experimentally demonstrated. This novel method for producing zero-gain slow and fast light takes advantage of the great flexibility of stimulated Brillouin scattering in optical fiber ...

2006

Multi-hydrogenated compounds monitoring in optical fibre manufacturing process by photoacoustic spectroscopy

Sub-ppm hydrogen chloride (HCl) and water vapour (H2O) monitoring using photoacoustic spectroscopy in optical fibre manufacturing is reported. The development and performance of a sensor based on an acoustic resonant configuration is described, and on-site ...

Springer Verlag2006

Slowing light in optical fibres sees fast progress

Luc Thévenaz, Kwang-Yong Song

Slowing down light to produce optical delay lines for communication networks has advanced enormously in the last year. Luc Thévenaz and Miguel Gonzalez-Herraez chart this recent progress and describe the new challenges facing developers of practical device ...

IOP Publishing2006

Time biasing due to the slow-light effect in distributed fiber-optic Brillouin sensors

The influence of the slow-light effect on the performance of distributed Brillouin sensors is studied. We show that, while in most situations it can be neglected, it may greatly affect the results obtained for certain experimental configurations. More spec ...

Optical Society of America2006

Wavelength modulation photoacoustic spectroscopy: Theoretical description and experimental results

Luc Thévenaz, Kwang-Yong Song

A theoretical description of photoacoustic spectroscopy generated by wavelength modulation of a semiconductor laser source is reported for a Lorentzian absorption line. This model describes the first- and second-harmonic photoacoustic signals produced by a ...

Elsevier2006

Arbitrary-bandwidth Brillouin slow light in optical fibers

Brillouin slow light in optical fibers is a promising technique for the development of all-optical buffers to be used in optical routers. The main drawback of this technique up to now has been its narrow bandwidth, normally restricted to 35 MHz in conventi ...

2006

Progress in Brillouin Slow Light and Its Impact in Fiber Sensing

Luc Thévenaz, Kwang-Yong Song, Sang Hoon Chin

This paper reviews the major advances in Brillouin slow light devices along the last two years. We also focus on the positive and negative implications of this effect in the development of fiber sensors. ...

Optical Society of America2006

Highly efficient Brillouin slow and fast light using As2Se 3 chalcogenide fiber

Luc Thévenaz, Kwang-Yong Song

We demonstrate the generation of slow and fast light based on stimulated Brillouin scattering in As2Se3 chalcogenide fiber with the best efficiency ever reported. The Brillouin gain of 43 dB is achieved with only 60-mW pump power in a 5-m single-mode chalc ...

2006

Frequency-stabilised laser reference system for trace-gas sensing applications from space

Luc Thévenaz, Laura Abrardi, Daniela Werner, Sang Hoon Chin

A four-wavelength low-power continuous-wave frequency laser reference system has been realised in the 935.4-nm range for water vapour differential absorption lidar (DIAL) applications. The system is built around laboratory extended-cavity and DFB diode las ...

ESA2006

Sub-ppm multi-gas photoacoustic sensor

A photoacoustic multi-gas sensor using tuneable laser diodes in the near-infrared region is reported. An optimized resonant configuration based on an acoustic longitudinal mode is described. Automatic tracking of the acoustic resonance frequency using a pi ...

Elsevier2006

Fibre Distributed Sensing for a More Secure Society

Brillouin time-domain analysis in optical fibres is a novel technique making possible a distributed measurement of temperature and strain over long distance and will deeply modify our view about monitoring large structures, such as dams, bridges, tunnels a ...

Wroclaw University of Technology2006

Ammonia trace measurements at ppb level based on near-IR photoacoustic spectroscopy