Abstract: The present invention relates to a method for manufacturing vertical optical coupling structures (1) between first optical or optoelectronic components (2) and second optical or optoelectronic components (3). Said vertical optical coupling structures are made by: (1) depositing a main layer (A) onto a substrate (25) including second optical or optoelectronic components; and (ii) lithography and/or physico-chemical etching of the main layer. Each vertical optical coupling structure is made such as to be located facing and making contact with a second optical component located in the substrate. The unitary main layer comprises generally frusto-conical coupling portions (12) consisting of a material having a refractive index greater than the refractive index of air.
Type:
Grant
Filed:
February 6, 2015
Date of Patent:
September 11, 2018
Assignees:
CNAM—Conservatoire National Des Arts Et Metiers, Chambre de Commerce et D'Industrie de Region Paris Ile de France (ESIEE Paris)
Abstract: The invention relates to a method for manufacturing an aluminum/metal assembly including the steps involving: thermally processing an aluminum sheet by heating said sheet to a temperature of between 80% and 100% of the melting temperature of the material of which it consists for a sufficiently long duration to create and stabilize by allotropic conversion an alpha alumina layer at the surface of said aluminum sheet, and then cooling same; providing a metal layer having a ductility less than or equal to the ductility of the aluminum sheet after cooling, said layer having surface irregularities having a depth greater than or equal to the thickness of the alpha alumina layer; and roll bonding the aluminum layer and the metal layer to produce the metal assembly.
Type:
Grant
Filed:
March 11, 2011
Date of Patent:
July 5, 2016
Assignees:
Centre National de la Recherche Scientifique (CNRS), CNAM—Conservatoire National Des Arts Et Metiers, Ecole Normale Superieure De Cachan
Inventors:
Laurent Prevond, Nicolas Collard, Renaud Caplain, Pierre Francois
Abstract: The invention relates to a method for manufacturing an aluminum/metal assembly consisting of a metal layer made of a first metal on the surface of a metal object made of a second metal, the first or second metal being aluminum, wherein said method includes the following steps: placing a metal foam having an open porosity on a surface of the metal object, and applying mechanical stress to the metal foam in such a manner that said foam becomes embedded in the surface of the object.
Type:
Grant
Filed:
March 11, 2011
Date of Patent:
June 21, 2016
Assignees:
Centre National de la Recherche Scientifique (CNRS), CNAM—Conservatoire National des Arts Et Metiers, Ecole Normale Superieure de Cachan
Inventors:
Laurent Prevond, Nicolas Collard, Renaud Caplain, Pierre Francois
Abstract: This method for the estimation of a channel between an emitter and a receiver, where the said emitter emits a signal comprising symbol frames distributed in time and frequency, among which pilot symbols known to the receiver, is characterized in that it comprises the following steps: •—computation (30) of a covariance matrix MF and MT of the channel in the frequency and time domains respectively; •—decomposition (32) of the covariance matrices MF and MT into eigenvectors according to the relations MF?WFHNFWF and MT?WTHNTWT; •—computation (34) of the Kronecker product of the matrices NVF and WT to obtain an eigenvector matrix W; •—computation (34) of a diagonal eigenvalue matrix N equal to the Kronecker product of the eigenvalue matrices NF and NT; and •—estimation of the channel with the help of pilot symbols and matrices W and N using the maximum a posteriori or quadratic error minimisation criterion.
Type:
Grant
Filed:
November 28, 2012
Date of Patent:
October 20, 2015
Assignees:
CASSIDIAN SAS, CNAM—CONSERVATOIRE NATIONAL DES ARTS ET MÉTIERS
Inventors:
Philippe Mege, Laurent Martinod, Luc Fety, Olivier Perrin