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Luc Thévenaz

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Publications associées (373)

Nanophotonic supercontinuum based mid-infrared dual-comb spectroscopy

Luc Thévenaz, Tobias Kippenberg, Camille Sophie Brès, Wolfgang Hänsel, Hairun Guo, Junqiu Liu, Wenle Weng

We demonstrate a broadband mid-infrared dual-comb spectroscopy for parallel gas-phase detection in the functional group region from 2800–3600 cm−1, using dispersion engineered silicon nitride dual-core waveguides which produce broadband, intensity-enhanced ...

Optical Society2019

Phase Sensitive OTDR Strain Measurement Using Single Mode Operation in Multimode OM4 Fiber

Luc Thévenaz, Zhisheng Yang, Alejandro Dominguez Lopez

We present the first realization of strain sensing in a multimode OM4 optical fiber using phase-sensitive optical time-domain reflectometry. We demonstrate that single mode operation in an OM4 fiber is achievable and allows the fiber strain to be measured ...

2019

Guest Editorial JLT Special Issue on OFS-26

Luc Thévenaz, Marcelo Alfonso Soto Hernandez

The sixty-two papers in this special issue were presented at the 26th International Conference on Optical Fibre Sensors (OFS-26). ...

IEEE Institute of Electrical and Electronics Engineers2019

Large stimulated Brillouin scattering amplification in gases

Luc Thévenaz, Flavien Gyger

We exploit backward stimulated Brillouin scattering in gases to achieve unprecedented nonlinear optical amplification in fibers. The gain coefficient is 10 times larger than any reported nonlinear gain in gas-filled HC-PCF and 6 times larger than the large ...

SPIE2019

Performance analysis of the differential pulse-width pair Brillouin optical time domain analysis using the log normalized and linearly normalized gain

Luc Thévenaz, Simon Adrien Zaslawski, Zhisheng Yang

The performance of the differential pulse-width pair Brillouin optical time domain analysis (DPP-BOTDA) is evaluated experimentally using either the gain from log normalization or linear normalization for the subtraction of traces collected with pump pulse ...

SPIE2019

Short spatial resolutions retrieval from a long pulse BOTDA trace

Luc Thévenaz, Simon Adrien Zaslawski, Zhisheng Yang, 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

Massive nonlinear optical amplification in gas

Luc Thévenaz, Flavien Gyger

We achieve unprecedented nonlinear optical amplification in gas. The gain is 20 times larger than any reported nonlinear gain in gas-filled HC-PCF and 6 times larger than the largest nonlinear gain in standard silica single-mode fiber (SMF). Furthermore, o ...

2019

Nanophotonic Supercontinuum-Based Mid-Infrared Dual-Comb Spectroscopy

Luc Thévenaz, Tobias Kippenberg, Camille Sophie Brès, Wolfgang Hänsel, Hairun Guo, Junqiu Liu, Wenle Weng

An optically stabilized dual-comb system at telecom wavelength is used to drive a mid-infrared spectroscopy for parallel gas-phase detection in the functional group region from 2800-3600 cm -1 . A coherent broadband intensity-enhanced spectrum in the mid-i ...

IEEE2019

High spatial resolution and intrinsically strain-insensitive distributed temperature sensing based on stimulated Brillouin scattering in gas

Luc Thévenaz, Flavien Gyger

Temperature/strain cross sensitivity is a long-standing issue in Brillouin-based distributed sensors, impairing the reliability of such sensors. So far, all the proposed methods perform the discrimination by measuring two quantities showing distinct respon ...

SPIE2019

Optimizing the signal-to-noise ratio for direct-detection BOTDA

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Zhisheng Yang, Sheng Wang

The signal-to-noise ratio (SNR) of the measurement for direct-detection Brillouin optical time-domain analyzers is modelled and experimentally validated, with and without the use of optical pre-amplification. Results indicate that preamplification associat ...

SPIE2019

Large Brillouin Interaction in Hollow Core Fibers

Luc Thévenaz, Flavien Gyger

Brillouin gain is observed in hollow core fibers filled by standard gases at high pressure. This enables all interactions based on stimulated Brillouin scattering to be realized in hollow core fibers, such as amplification, optical signal processing and di ...

IEEE2019

Distributed forward stimulated Brillouin scattering measurement using broadband BOTDR

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

Brillouin optical time-domain reflectometry is used to perform distributed forward stimulated Brillouin scattering (FSBS) measurements. This configuration suppresses the need for an additional frequency scanning to evaluate the local Brillouin peak gain wh ...

SPIE2019

Opto-acoustics in optical fibres for sensing applications

Luc Thévenaz, Desmond Chow Ming Chia, Zhisheng Yang

IEEE2019

A kilometre-range distributed relative humidity sensor

Luc Thévenaz, Kenny Hey Tow, Li Zhang, 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

Analysis and Reduction of Large Errors in Rayleigh-based Distributed Sensor

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Zhisheng Yang, Li Zhang, Luis Costa

Commonly, the frequency shift of back-reflection spectra is the key parameter to measure quantitatively local temperature or strain changes in frequency-scanned Rayleigh-based distributed fiber sensors. Cross-correlation is the most common method to estima ...

IEEE Institute of Electrical and Electronics Engineers2019

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

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

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

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

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

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

Forward Brillouin scattering acoustic impedance sensor using thin polyimide-coated fiber

Luc Thévenaz, Desmond Chow Ming Chia

The standard single-mode fiber has been demonstrated as an optomechanical sensor recently to measure the acoustic impedances of surrounding liquids by means of the generation and detection of forward-stimulated Brillouin scattering (FSBS). FSBS allows the ...

2018

Hybrid Golay-coded Brillouin optical time-domain analysis based on differential pulses

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Zhisheng Yang, Zonglei Li

Different approaches to implement unipolar Golay coding in Brillouin optical time-domain analysis based on a differential pulse pair (DPP) are investigated. The analysis points out that dedicated post-processing procedures must be followed to secure the sh ...

2018

Opto-acoustic chemical sensor based on forward stimulated Brillouin scattering in optical fiber

Luc Thévenaz, Desmond Chow Ming Chia

Stimulated Brillouin scattering is well-known for providing distributed measurements in the field of optical fiber sensing. For the conventional backward stimulated Brillouin scattering, the sensing capability is nevertheless limited to temperature and mec ...

IEEE2018

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