Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

Safran

Aryballe

Commissariat a L'energies Alternatives

Alcatel Lucent

Aryballe Technologies

Biom Rieux S.a.

Pierre Labeye

Laurent Duraffourg

Patrick Pouteau

Sergio Nicoletti

Salim Boutami

Boris Taurel

Eric Ollier

Mickaël Brun

Jean-Marc Fedeli

Serge Gidon

Thierry Livache

Mathieu Dupoy

Claude Chabrol

Gilles Grand

Maryse Fournier

Alain Gliere

Frederic Revol-Cavalier

Guillaume Laffont

Cyril Herrier

François Perraut

Justin Rouxel

Herve Denis

Alexandros Kapsalis

Francois Ladouceur

Loïc Laplatine

Dimitris Syvridis

Adonis Bogris

Grégory Maisons

A signal-distributing device that includes an arrayed-waveguide-grating demultiplexer and at least one receiving module. Each receiving module includes a multimode interference coupler and two output waveguides, the multimode interference coupler being located between the arrayed-waveguide-grating demultiplexer and the two output waveguides. The multimode interference coupler is configured to distribute, to the two output waveguides, an optical signal delivered by the arrayed-waveguide-grating demultiplexer. Such a device allows wavelength shifts in the signal delivered by a set of one or more sensors, in particular Bragg grating reflectors inscribed in a given optical fibre, to be measured. It allows a wavelength shift to be measured with a high linearity and a signal-to-noise ratio.

Device for distributing a signal for measuring wavelength shifts

A photonic integrated circuit for an interferometric sensor includes a first waveguide called sensitive arm wherein a first portion of the light radiation is propagated, the sensitive arm being exposed to a first ambient medium and to at least one compound to be detected inducing a modification of the local refractive index perceived by the evanescent part of the electromagnetic field of the first portion of the light radiation, and a second waveguide called reference arm wherein a second portion of the light radiation is propagated, an encapsulation layer encapsulating the reference arm, the encapsulation layer being impermeable to the compound or compounds to be detected, so that the reference arm is exposed only to a second ambient medium, substantially of the same nature as the first ambient medium and without the compound to be detected and interferometric sensor comprising a photonic integrated circuit according to the invention.

Photonic integrated circuit with encapsulated reference arm

An opto-mechanical resonator including a waveguide formed by a plurality of first strips spaced apart from one another; and two mirrors disposed facing one another, which mirrors are optically reflective over at least part of a guide wavelength range of the waveguide. The waveguide extends between the two mirrors, and forms therewith an optically resonant cavity. At least part of the waveguide is held such that it is suspended over a substrate by at least one deformable mechanical element.

Subwavelength waveguide opto-mechanical resonator

The invention relates to an optical coupler () in a vertical configuration, capable of working for a wavelength and comprising a first waveguide () and a second waveguide (). The second waveguide () has a patterning () in the form of a series of patterns (), the patterns () extending along a transverse direction (X) perpendicular to the longitudinal direction (Z), being parallel to each other and orthogonal to the general direction of the first waveguide (), each pattern () being arranged both in the core () and the cladding () of the second waveguide () and having parameters influencing the evanescent wave coupling between the first waveguide () and the second waveguide (), said parameters being chosen such that the coupling (C) is greater than 15%.

Optical coupler provided with a structuration

An element of a photoacoustic sensor combines an optomechanical resonator and a photoacoustic cavity. The photoacoustic cavity is formed by a measurement chamber, traversed by a pulsed excitation beam. The optomechanical resonator is formed by an optical resonator, a mechanical element for being set in rapid oscillations, by an optical signal confined in the optomechanical resonator, and in slow oscillations, by an acoustic wave generated in the photoacoustic cavity. A measurement beam is sent into the optical resonator, where it carries out several passages via the mechanical element. The optical properties thereof at the output of the optical resonator are therefore dependent on the oscillations of the mechanical element. A low-frequency-amplitude-modulated high-frequency signal can be obtained, with the amplitude modulation representing the acoustic wave in the measurement chamber. An accurate, low-noise, and highly compact method is enabled for making measurements with a photoacoustic effect.

Photoacoustic sensor with optomechanical coupling

A measuring device includes a first light source for emitting an excitation beam at an excitation wavelength; and an excitation optical cavity, optically resonant at the excitation wavelength, and arranged such that it receives the excitation beam; a second light source for emitting a measurement beam at a measurement wavelength; and a mechanical element mounted such that it can move about an elastic recovery position and/or such that it is elastically deformable, located both on the optical path of the excitation beam in the excitation optical cavity and on the optical path of the measurement beam, and capable of being displaced and/or deformed by the excitation beam. One of either the excitation beam or the measurement beam is capable of causing the movable and/or deformable mechanical element to oscillate. The measuring device can in particular be used as a gas sensor or as a mass spectrometer.

Measuring device based on an optical measurement in an opto-mechanical cavity

An optomechanical system including a guide structure, to guide a light beam; and two waveguide segments. Each guide structure include beams that together form two combs partially nested one in the other. At least one beam is free to move in translation along an axis orthogonal to the long axis of the guide structure. A displacement into an optical phase shift, while limiting additional effects on the intensity.

System for transduction of displacement to optical phase shift

The invention relates to an optical coupler () in a vertical configuration, comprising a first waveguide () and a second waveguide (). The optical coupler () comprises a third waveguide () distinct from the first and second waveguides () and extending parallel to the first and second waveguides (), the third waveguide () being arranged between the first waveguide () and the second waveguide () in a transverse direction (X) perpendicular to the longitudinal direction (Z) and having parameters influencing the evanescent wave coupling between the first waveguide () and the second waveguide (), those parameters being chosen such that the coupling (C) is greater than 15%.

Optical coupler provided with an intermediate waveguide

A device for non-linear conversion of first infrared signal into a second infrared signal with a wavelength that is less than that of the first infrared signal by means of four-wave mixing, which includes at least one portion of SiGe arranged on at least one first layer of material with a refractive index which is less than that of silicon, a germanium concentration in the portion of SiGe which varies continuously between a first value and a second value which is greater than the first value, in a direction which is approximately perpendicular to a face of the first layer on which the portion of SiGe is arranged, and in which a summital part of the portion of SiGe where the germanium concentration is equal to the second value is in contact with a gas and/or a material with a refractive index which is less than that of the silicon.

Device for non-linear signal conversion by four-wave mixing

Microelectronic photoacoustic detection device comprising:

Helmholtz type differential acoustic resonator detection device

A micromonochromator is formed on a substrate and includes a diffraction device ( ) associated with an entry that includes at least one entry point and an exit that includes at least one exit point. A mobile arrangement of light guidance ( - - ) is associated with the entry or the exit or both, and a recovery device ( ) is provided by the exit. The mobile arrangement includes at least one mobile beam integrated in the substrate and equipped with at least one light guide. The mobile beam is able to sweep the entry and/or exit in a continuous manner.

Micromonochromator and method for producing same

A positioning system for an optical microstructure (,) in a devise (,) operating under the action of a control means includes a flexible element (,) supporting the optical microstructure and connected to the device. The orientation of the flexible element with respect to the device can be varied under the action of control means in order to put the optical microstructure (,) into at least one determined position. The flexible element is immobilized with respect to the device in order to hold the optical microstructure (,) in the determined position when the control means no longer act.

Optical microstructure positioning system

The invention relates to an integrated optical device having an optical microguide (,) of index n,between two media of respective refractive indices n,and n&prime;,, such that n,<n,and n&prime;,>n,, and filtering means (,) constituted by at least one reflector element placed on at least one side of the microguide, the reflector elements having at least one element etched in layers of index n,and/or n&prime;,and/or n,.

Integrated optical filter

A device for the positioning and holding of an optical fiber having a substrate, a groove for receiving the optical fiber, and at least one first and one second groove widenings along a longitudinal axis of said groove. An adhesive substance is introduced in one of the two widenings, said adhesive substance fixing the fiber to the substrate. A process for fixing a fiber to a substrate includes the steps of positioning the fiber, holding said fiber with a tool, and introducing an adhesive substance for fixing the fiber to a substrate.

Process and system for positioning and holding optical fibers

An optomechanical sensor for measuring or detecting an acceleration or a vibration in at least one direction. The sensor has a frame, and a flexible beam having two ends. A first end is attached to the frame and a second end is mobile in the at least one direction, in response to an acceleration movement of the frame. The flexible beam includes an optical guiding structure having an input and an output. The frame has N light collection elements, where N is an integer .gtoreq.2. The frame also includes a multi-mode coupler having an input facing the output of the optical guiding structure and N outputs, the coupler coupling an optical signal at the output of the optical guiding structure to the N light collection elements. The multi-mode coupler may also transform an input light beam having a maximum into a distribution having N maxima at the output of the coupler.

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Grenoble, France

Pierre Labeye