France Telecom

France Telecom Etablissement Autonome De Droit Public

Alcatel

Adrien Bruno

Arnaud Rigny

Pascal Win

Louis Menigaux

Catherine Ramus

Boumedienne Mersali

Louis Giraudet

Frederic Ghirardi

A method of controlling movement of a line of sight of a video camera mounted on a mobile videoconferencing terminal includes: a) a step () of using at least two microphones spaced apart from each other in three dimensions and attached to the mobile terminal to pick up a sound uttered by a user of the mobile terminal, b) a step () of responding to the signals from the microphones to establish a direction in which the mouth of the user is located, and c) a step () of controlling movement of the line of sight as a function of the direction established during step b).

Method and a device for controlling the movement of a line of sight, a videoconferencing system, a terminal and a program for implementing said method

Image taking system and a telephone, a mobile telephone and a telephone holder used by said system

The invention relates to a system for interchanging optical signals over an optical fiber. The system comprises an optical component of the spectrograph type having an array of waveguides, an optical signal emitter and an optical signal receiver, a channel of one of the couplers of the optical component being connected to the optical fiber, a first channel and a second channel of the other coupler of the optical component being connected respectively to an inlet of the receiver and to an outlet of the emitter, and the said other coupler having a third channel connected to a port of another optical component of the system.

System for interchanging optical signals over an optical fiber

The present invention relates to an optical component of the waveguide array spectrograph type, the component comprising an inlet coupler and an outlet coupler between which said array extends, and including optical channels constituting inlets and outlets for the inlet and outlet couplers, the component being suitable for multiplexing and/or demultiplexing two optical signals of different wavelengths conveyed by two channels of the same coupler, wherein the waveguides of the array have lengths that are distributed in such a manner that two spectrum ranges of different center wavelengths both occur in said same coupler, said different wavelengths that are conveyed by the two channels each belonging to a different one of the free spectrum ranges.

Optical component of the waveguide array spectrograph type, having centered outlet channels

The present invention concerns a device forming an optical multiplexer and/or demultiplexer of the type including two plane optical surfaces separated by an array of waveguides having controlled differences in length, wherein each waveguide comprises at least two spans placed in series and having respective lengths and refractive indices that are suitable for controlling the influence of temperature variations on the device.

Temperature-independent optical multiplexer and/or demultiplexer

The present invention relates to a multiplexer and/or demultiplexer optical component of the waveguide array spectrograph type, the component comprising an inlet coupler and an outlet coupler in a star configuration between which said array extends, the array having a first directed mean direction on departure of the waveguides of the array from the inlet coupler, and a second directed mean direction on arrival of the waveguides of the array at the outlet coupler, and presenting a directed general axis defined as being the axis passing through the centers of the couplers and on which a single positive direction is defined, and in which the first and second directed directions have respective directive angles measured algebraically from the general directed axis, which angles have the same sign.

Optical component having a waveguide array spectrograph with improved

The present invention relates to a multiplexer and/or demultiplexer optical component of the waveguide array spectrograph type, wherein the waveguides are numbered in order of increasing optical path length, the optical path lengths of the waveguides describing a function of waveguide number which varies about a mean linear function, a difference measured between said waveguide number function and said mean linear function describing a difference function not limited to a set of two linear functions, said difference function being suitable for giving the optical component a spectral response that is square in shape.

Demultiplexer with a square spectral response

A spectrographic type multiplexer and/or demultiplexer optical component having an array of waveguides, the component comprising a star inlet coupler and a star outlet coupler with said array extending therebetween, and also comprising an inlet light guide and an outlet light guide for said inlet and outlet couplers, respectively, wherein the spectrum response of the component is the sum of two substantially Gaussian spectrum responses of peaks that are offset in wavelength.

Spectrographic multiplexer component having an array of waveguides

The invention relates to a multi-wavelength filter that is insensitive to polarization, comprising a bundle of optical waveguides made on a common substrate and organized in such a manner that the wavelength response of the filter depends on the phase shifting to which the light propagating in the waveguides is subject. The filter also comprises polarization rotators placed on the path of the light in such a manner that in each of the optical waveguides the light paths for the TE and TM polarization modes are of equal length. The polarization rotators are of the type comprising means for loading each optical waveguide and for creating asymmetry in the effective refractive index thereof.

Multi-wavelength filter that is insensitive to polarization with means

The invention relates to a multi-wavelength filter having a bundle of optical waveguides formed on a common substrate and organized in such a manner that the wavelength response of the filter depends on the phase shifting to which light is subjected in the optical waveguides of the bundle. The filter is of the type in which polarization insensitivity is obtained by varying the birefringence of the optical waveguides. The optical waveguides of said bundle have the same birefringence in two end zones while in an intermediate zone they have birefringence that is different from that of said end zones. In the bundle of waveguides, the transitions between intermediate zone and the end zones extend along respective planes that are inclined relative to the direction of light propagation along the waveguides. The portions of the waveguides situated respectively in the intermediate zone and in an end zone are interconnected by means of respective mode matchers that are hourglass-shaped.

Polarization-insensitive demultiplexer and a method of manufacture

A semiconductor opto-electronic device including at least one electronic function component (62), at least one optical function component (60) and a mode transformer associated with the optical function component. At least some layers of semiconductor material constituting the electronic function component also form optical layers in the mode transformer zone and, at least in the mode transformer zone, these semiconductor material layers are non-absorbent at the operating wavelength. The mode transformer is preferably etched in the shape of an hourglass.

Opto-electronic semiconductor device including an integrated mode

This invention concerns an optoelectronic device, characterized in that it comprises, integrated by deposition in a single epitaxy on a semi-insulating substrate: at least one mode adapter (T), at least one optical amplifier (OA), at least one filter (MUX) capable of separating different wavelengths of the signal, at least one photodetector (D) and at least one guide (G) ensuring the link between the above-mentioned elements.

Technical field of optoelectronics

Optoelectronic device integrating a photodetector having two diodes arranged side by side, constructed from layers of semiconductor material on a substrate that also incorporates a light guide for directing light to the diodes. The two identical, juxtaposed diodes (D1, D2) are arranged head to tail. The diode ensuring the photodetection is that which is reverse biased.

Optoelectronic device integrating a light guide and a photodetector

In a process for producing integrated structures having at least one cleaved optical guide, the following are successively epitaxied onto a planar surface of a monocrystalline substrate parallel to a plane of the substrate having crystal orientation &lt;1,0,0&gt;: an etching barrier layer for the substrate, a lower optical confinement layer, an active layer and an upper optical confinement layer. Then, the epitaxied layers are etched to form an optical guide strip having a portion oriented parallel to a first direction of crystal orientation &lt;0,1,1&gt; of the substrate.

Process for producing a structure integrating a cleaved optical guide

An optoelectronic device having an optical guide and photodetector integrated on a common substrate is provided with a light coupling means for increasing the absorption of light within the photodetector. This means consists of freeing the lower portion of the guide layer--opposite the photodetector--to bring it into contact with air. The use of air has the effect of repelling the light propagating through the guide layer towards the absorbent layer of the photodetector thereby increasing the photodetector efficiency.

Growing community of inventors

Palaiseau, France

Adrien Bruno