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Advanced methods for Brillouin based distributed optical fiber sensors

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Keeping up with our constantly connected lifestyle of instant messages and video streaming has its repercussions. Data centers have been gobbling up resources becoming a significant share of the energy used worldwide. To keep up with demand and curb the en ...

EPFL2023

Tunable pump compression and fast modulation for pulsed THz generation

Ileana-Cristina Benea-Chelmus, Alessandro Tomasino, Yazan Lampert Almahmoud, Shima Rajabali

We demonstrate tunable dispersion compensation of femtosecond pulses at telecom wavelengths for broadband Terahertz generation in 7.5-meter fiber link using a Silicon prism pair. The prism pair enhances the amplitude of the THz E-field in InGaAs photocondu ...

New York2023

A study of the effect of humidity on acrylate- and polyimide-coated fibres is analysed over a large range of humidity and temperature (-20 °C to +50 °C) using phase-sensitive Rayleigh reflectometry. ...

2020

Opto-mechanical cross-talk reduction in air-holes multicore fibers

Luc Thévenaz, Zhisheng Yang, Simon Adrien Zaslawski, Yun Fu

We report on the use of air-holes in multicore fibers to alleviate intercore perturbations induced by forward stimulated Brillouin scattering. Comparisons with conventional multicore fibers show significant improvement in terms of cross-talk reduction. ...

Optical Society of America2020

The integration of new materials mediating light-matter interaction in nanoscale devices is a persistent goal in nanophotonics. One of these materials is Gallium phosphide, which offers an attractive combination of a high refractive index (n=3.05 at a wave ...

EPFL2019

Light-Matter Interaction in III-Nitride Waveguides: Propagating Polaritons and Optical Gain

Joachim Armand Simonne Ciers

III-nitride waveguides featuring AlInN claddings and GaN/AlGaN quantum wells (QWs) offer promising perspectives for applications in many fields of short-wavelength photonics. Thanks to their nearly lattice-matched nature, these structures exhibit an excell ...

EPFL2018

Recent Advances in Resonant Waveguide Gratings

Olivier Martin, Benjamin Gallinet, Giorgio Quaranta, Guillaume Basset

Resonant waveguide gratings (RWGs), also known as guided mode resonant (GMR) gratings or waveguide-mode resonant gratings, are dielectric structures where these resonant diffractive elements benefit from lateral leaky guided modes from UV to microwave freq ...

2018

Polyimide Coated Fiber as Optomechanical Sensor

Luc Thévenaz, Desmond Chow Ming Chia

A commercially available optical fiber coated with 8 µm-thickness polyimide is used for measuring the acoustic impedance of the surrounding liquid materials, by means of the generation and detection of forward stimulated Brillouin scattering (FSBS). ...

Optical Society of America2018

Impact of modulation instability on distributed optical fiber sensors

Mohammad Mehdi Alem Karladani

Modulation instability (MI) as the main limit to the sensing distance of distributed fiber sensors is thoroughly investigated in this thesis in order to obtain a model for predicting its characteristics and alleviating its effects. Starting from Maxwell's ...

EPFL2016

Owing to the advantages of the optical fibre, such as lightweight, small size, low cost and immunity to electromagnetic interferences, the fibre sensors have been applied in diverse fields and the scientific research on fibre sensing keeps improving to mee ...

EPFL2016