Recherche

Afficher tous les résultats pour

Accueil

Personne

Marcelo Alfonso Soto Hernandez

Cette personne a quitté l’EPFL

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (104)

Page 5 sur 6

Distributed Alarm System Based on OTDR Interrogation of Side Air-Hole Fibers

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Yuting Yang

A distributed sensor for multi-event alarm triggering is demonstrated by measuring the loss change induced by the liquefaction of pressured CO2 trapped along a side air-hole fiber. ...

2023

Double-pulse Brillouin distributed optical fiber sensors: analytical model and experimental validation

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Sang Hoon Chin

An analytical model is presented to describe the behavior of the acoustic wave, probe signal and Brillouin gain in double-pulse Brillouin optical time-domain analysis (DP-BOTDA) sensors. The proposed model is a tool that provides a full physical insight in ...

Spie-Int Soc Optical Engineering2012

Novel technique for distributed fibre sensing based on coherent Rayleigh scattering measurements of birefringence

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Xin Lu

A novel distributed fibre sensing technique is described and experimentally validated, based on birefringence measurements using coherent Rayleigh scattering. It natively provides distributed measurements of temperature and strain with more than an order o ...

Spie-Int Soc Optical Engineering2016

Towards 1’000’000 resolved points in a distributed optical fibre sensor

Luc Thévenaz, Marcelo Alfonso Soto Hernandez

Increasing the number of resolved points, by either improving the spatial resolution or extending the measurement range, is one of the main challenges being currently faced in distributed optical fibre sensing. This paper explores the main parameters affec ...

SPIE2014

Curvature and shape distributed sensing using Brillouin scattering in multi-core fibers

Luc Thévenaz, Marcelo Alfonso Soto Hernandez

Distributed curvature and shape sensing using Brillouin scattering in multi-core fiber (MCF) is presented for the first time to the best of our knowledge, by exploiting bend-dependent Brillouin frequency shift (BFS) in off-center cores. ...

Optical Society of America2016

Highly Sensitive Dispersion Map Extraction from Highly Nonlinear Fibers Using BOTDA Probing of Parametric Amplification

Luc Thévenaz, Camille Sophie Brès, Marcelo Alfonso Soto Hernandez, Armand Vedadi-Comte, Andrey Denisov, Fatemeh Alishahi

Using an enhanced scheme for probing the distribution of parametric processes along fibers, a rapid and simple technique to map zero dispersion wavelength fluctuations of less than 0.02 nm with 2 meters resolution is demonstrated. ...

2013

Generation of Nyquist sinc pulses using intensity modulators

Luc Thévenaz, Camille Sophie Brès, Marcelo Alfonso Soto Hernandez, Armand Vedadi-Comte, Mohammad Amin Shoaie, Mohammad Mehdi Alem Karladani

Optical sinc-shaped Nyquist pulses are produced based on the generation of an ideal frequency comb using cascaded intensity modulators. Nyquist pulses with 9.8-ps temporal width, 82-fs jitter and more than 40 dB SNR are achieved. ...

2013

Highly tunable method to generate sinc-shaped Nyquist pulses from a rectangular frequency comb

Luc Thévenaz, Camille Sophie Brès, Marcelo Alfonso Soto Hernandez, Mohammad Amin Shoaie, Armand Vedadi-Comte, Mohammad Mehdi Alem Karladani

A method to produce highly-stable optical sinc-shaped pulses is proposed based on the generation of a rectangular-spectrum frequency comb. Nyquist pulses with

OSA2013

Brillouin distributed fiber sensing at ultra-high spatial resolution

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Andrey Denisov

Sophisticated techniques have been recently developed to achieve centimetric spatial resolution in distributed Brillouin fibre sensing, by-passing the slow response of this optoacoustic interaction by creating a localized stationary material vibration. Mor ...

IEEE2015

Distributed Temperature Alarm System Based on Incoherent Optical Time-Domain Reflectometry and Side Air-Hole Optical Fibers

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Yuting Yang

This paper proposes and experimentally validates a distributed temperature alarm system based on carbon dioxide (CO2)-filled 18 m side air-holes fiber (SAHF), interrogated through a conventional (incoherent) optical time-domain reflectometer (OTDR). Custom ...

IEEE Institute of Electrical and Electronics Engineers2024

Minimizing distortion and enlarging group delay in Brillouin slow light systems by gain profile optimization

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Li Zhang

Optimal gain spectra minimizing distortion and enhancing delaying efficiency in linear slow light systems are predicted and experimentally validated by shaping the gain spectral profile in a Brillouin fiber amplifier. ...

Optical Society of America2014

System and method for producing optical sinc-shaped pulses

Luc Thévenaz, Camille Sophie Brès, Marcelo Alfonso Soto Hernandez, Mohammad Amin Shoaie, Armand Vedadi-Comte, Mohammad Mehdi Alem Karladani

System and methods for producing a plurality of Sinc shaped pulses in the time domain include a light source for providing an input light signal having an input frequency, and at least one spectrum shaper for producing the plurality of Sinc shaped pulses f ...

United States Patent and Trademark Office2015

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

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

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

Optical sinc-shaped Nyquist pulses with very low roll-off generated from a rectangular frequency comb

Luc Thévenaz, Camille Sophie Brès, Marcelo Alfonso Soto Hernandez, Mohammad Amin Shoaie, Armand Vedadi-Comte, Mohammad Mehdi Alem Karladani

High-quality optical sinc-shaped Nyquist pulses with a virtual zero roll-off factor are obtained from the generation of a phase-locked, rectangular-spectrum frequency comb. Tunability over more than 4 frequency decades is demonstrated with

Optical Society of America2013

High-Resolution Distributed Differential Curvature Measurement Based on Phase-Sensitive Optical Time Domain Reflectometry and Multi-Core Fiber

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Zhisheng Yang, Alejandro Dominguez Lopez

A distributed curvature sensor based on multicore fiber and phase-sensitive optical time domain reflectometry is presented, demonstrating a resolution of 10 cm over ~25 m of sensing range. ...

Optical Society of America2018

1’000’000 resolved points along a Brillouin distributed fibre sensor

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Andrey Denisov

The challenge to resolve a record of one million points along a single optical fibre is demonstrated using a Brillouin distributed fibre sensor. The proposed system is based on a phase-correlation technique combined with a temporal pump gating, making poss ...

SPIE2014

Closed-loop Controlled Brillouin Optical Time-Domain Analysis

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Zhisheng Yang

A closed-loop controlled BOTDA distributed optical fibre sensor is proposed for tracking fast temperature-strain evolution. The measurement time is reduced by two orders of magnitude with respect to classical BOTDA sensing, while keeping the same accuracy ...

IEEE2017

Impact of Fitting and Digital Filtering on Signal-to-Noise Ratio and Brillouin Frequency Shift Uncertainty of BOTDA Measurements

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

The intricate relationships linking signal-to-noise ratio and Brillouin frequency shift uncertainty after post-processing of Brillouin optical time-domain analysis measurements are investigated, highlighting the crucial impact of fitting. ...

OSA2018

Brillouin distributed fiber sensors: Practical limitations and guidelines for the making of a good sensor

Luc Thévenaz, Marcelo Alfonso Soto Hernandez

By analyzing the fundamentals of the operation of Brillouin sensors it will be shown that all efforts must be focused on obtaining the largest signal-to-noise ratio on the raw optical signal, which ultimately scales all performance of the sensor. Guideline ...

IEEE2014

Mapping the Uniformity of Optical Microwires Using Phase-Correlation Brillouin Distributed Measurements

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Kenny Hey Tow, Andrey Denisov, Desmond Chow Ming Chia

The distributed Brillouin gain profile of an ultrathin optical microwire made of chalcogenide-glass is characterized using a phase-modulated correlation-domain measurement technique. Method resolves variations of uniformity below 5% along a 13 cm-long micr ...

OSA2015