TASCU , Sorin

In this paper, we present a non-standard fibre amplifier specially designed to amplify scar modes of a multimode chaotic optical fibre. More precisely, we introduce Ytterbium in the optical fibre as a gain medium localised on the maximum of intensity of the scar modes. After briefly recalling the relevance of a chaotic optical fibre as a device...

A multimode optical fiber with a D-shaped cross section is an experimental paradigm of a wave system with chaotic rays' dynamics. We show that seldom but usable modes, called scar modes, localized along some particular direction of the geometrical trajectories can be selectively excited. We report numerical simulations that demonstrate the...

We propose a new mode adapter which allows more efficient launching of the optical power selectively in the fundamental mode of a multimode waveguide. Theoretical and experimental results confirm that such a mode adapter increases the performances in terms of coupling efficiency, coupling tolerances and transmitted power with respect to...

Dans ce papier nous montrons comment l'échange protonique sous vide poussé (High Vacuum Proton Exchange : HiVacPE) permet de fabriquer sur LiNbO 3 , des guides présentant un fort confinement et de faibles pertes à la propagation en vue de réaliser des circuits optiques intégrés compacts et efficaces. MOTS-CLEFS : niobate de lithium, guides...

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We present the results of an experimental study of waveguide tapers realized in LiNbO3 using the soft-protonexchange process and the waveguide segmentation technique. Measurements show that they can be favorably introduced between the nonlinear or electrooptic part of the components, which require strong mode confinement to increase efficiency,...

Des systèmes simples, linéaires et conservatifs peuvent exhiber des dynamiques complexes du fait de leur géométrie. Le propos du chaos ondulatoire est d'étudier l'implication de ces dynamiques complexes sur le comportement des ondes[1]. Les fibres optiques hautement multimodes (les " f.o.h.m ") se révélent ainsi être de précieux supports...

—High-index contrast waveguides fabricated with precise control and reproducibility are of high interest for nonlinear and/or electro-optical highly efficient and compact devices for quantum and classical optical data processing. Here we present a new process to fabricate planar and channel optical waveguides on lithium niobate substrates that...

Le niobate de lithium périodiquement polarisé (PPLN) sur des périodes courantes de 6 à 22 µm trouve actuellement de nombreuses applications en optique non linéaire (ONL). La micro-structuration à plus courte période, c'est-à-dire de 2,5 µm à 300 nm, permettrait de nouvelles fonctionnalités, non seulement en ONL mais aussi en électro-optique....

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Up-conversion, or hybrid, detectors have been investigated in quantum communication experiments to replace Indium-Gallium-Arsenide avalanche photodiodes (InGaAs-APD) for the detection of infrared and telecom single photons. Those detectors are based on the supposedly noise-free process of frequency up-conversion, also called sum-frequency...

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We demonstrate supermode-based second harmonic generation in an integrated nonlinear interferometer made of linear and nonlinear directional couplers. We use a fully-fibered pump shaper to demonstrate second harmonic generation pumped by the symmetric or anti- symmetric fundamental spatial modes. The selection of the pumping mode and thus of a...

We demonstrate supermode-based second harmonic generation in an integrated nonlinear interferometer made of linear and nonlinear directional couplers. We use a fully-fibered pump shaper to demonstrate second harmonic generation pumped by the symmetric or anti-symmetric fundamental spatial modes. The selection of the pumping mode and thus of a...

We demonstrate supermode-based second harmonic generation in an integrated nonlinear interferometer made of linear and nonlinear directional couplers. We use a fully-fibered pump shaper to demonstrate second harmonic generation pumped by the symmetric or anti-symmetric fundamental spatial modes. The selection of the pumping mode and thus of a...

Progress in integrated photonics enables combining several elementary functions on single substrates for realizing advanced functionnalized chips. We report a monolithic integrated quantum photonic realization on lithium niobate, where nonlinear optics and electro-optics properties have been harnessed simultaneously for generating heralded...