Centre National De La Recherche Scientifique

France Telecom

France Telecom Etablissement Autonome De Droit Public (centre National

Institut Francais Des Sciences Et Technologies Des Transports, De L'amenagement Et Des Reseaux

Orange

Jean-Louis Oudar

Yves Nissim

Marcel Bensoussan

Elchuri K Rao

Sophie Bouchoule

Constantin Nelep

Aghiad Khadour

Houtai Choumane

Guy Georges Aubin

Jérémie Renaudier

Christophe Gosset

A measurement system for performing measurement by Brillouin scattering analysis, the system comprising a laser emitter device () configured to emit an incident wave (&#x3bd;) and a reference wave (&#x3bd;&#x2212;&#x3bd;B), the incident wave presenting an incident frequency (&#x3bd;) and the reference wave presenting a reference frequency (&#x3bd;&#x2212;&#x3bd;B), the reference frequency (&#x3bd;&#x2212;&#x3bd;B) being shifted from the incident frequency (&#x3bd;) by a predetermined value (&#x3bd;B). The system is configured to: Advantageously, the incident wave and the reference wave come from a dual-frequency vertical-cavity surface-emitting laser source () forming part of the laser emitter device.

Measurement system and temperature and/or shape change sensor using brillouin scattering analysis

The invention relates to a method for manufacturing mirrors with saturable semiconducting absorptive material, which includes: depositing a saturable semiconducting absorptive material () onto a growth substrate () in order to form a structure; depositing at least one metal layer onto the structure such as to form a first mirror (); and depositing a heat-conductive substrate () onto the metal layer by electrodeposition through an electrically insulating mask (), allowing the selective deposition of the thermally conductive substrate, in order to predefine the perimeter of the mirrors with saturable semiconducting absorptive material.

Method for manufacturing mirrors with semiconductor saturable absorber

This invention relates to a saturable absorber component comprising an absorbent material located between a front mirror and a rear mirror as well as a method for manufacturing a saturable absorber component. The metallic rear mirror is a metallic buried mirror fixed via a welding joint on a heat conductive substrate. The invention applies to the field of high-rate optical transmission.

Saturable absorber component and method for manufacturing a saturable absorber component

A vertical cavity laser emission component emitting via the surface at a wavelength lying in the range 1.3 .mu.m to 1.55 .mu.m, the component comprising a stack having two mirrors which reflect at the emission wavelength, plus one or more layers which are interposed between the two mirrors and which constitute an amplifying medium for the emitted radiation, wherein, in the vicinity of the amplifying medium, at least one of the mirrors presents a layer of Al.sub.x Ga.sub.1-x As where x lies in the range 0.8 to 1, which layer is selectively oxidized around an active central zone of the amplifying medium. In the method, two samples are grown epitaxially, one on an InP substrate and the other on a GaAs substrate, the two samples obtained in this way are assembled together by epitaxial adhesion of a GaAs layer of the second sample on an InP layer of the first sample, and the resulting sample is subsequently etched and then oxidized by hydrolysis.

Vertical cavity laser emission component that emits via the surface at a

This invention relates to a process for producing a matrix of 'all optical' vertically-structured quantum well components. This process consists in the encapsulation of a half-structure constituted by a lower mirror (2) and an active zone (3) partially covered by a self-alignment mask (4) with a negative dielectric layer (7) whose thickness is given by the Bragg condition at the working wavelength. The encapsulated half-structure is thermally treated to induce an alloy interdiffusion (9) in the non-covered parts of the active zone, and covered with one or several negative and positive layers (10,11) so as to complete the upper Bragg mirror.

Process for producing a matrix of 'all optical' vertically-structured

The system disclosed includes a light source (12) able to emit an intense, coherent, monochromatic beam, called the control beam, whose frequency is equal to the center optical frequency of one of several frequency multiplexed signals, which has been selected, an optical coupler (14) for coupling the signals and the control beam and an optical switching device (16) having an active material with a non-linear optical response, whose passband is narrower than the intervals separating the frequency band occupied by the selected siganl. The device receives the light from the optical coupler and supplies a beam reproducing the information of the selected signal. The invention can be used in telecommunications.

Growing community of inventors

Chatenay Malabry, France

Jean-Louis Oudar