Orange S.A.

About: Orange S.A. is a company organization based out in Paris, France. It is known for research contribution in the topics: Terminal (electronics) & Signal. The organization has 6735 authors who have published 9190 publications receiving 156440 citations. The organization is also known as: Orange SA & France Télécom.

Solipsis: A Decentralized Architecture for Virtual Environments

Abstract: Lack of scalability is a key issue for virtual-environment technology, and more generally for any large-scale online experience because it prevents the emergence of a truly massive virtual-world infrastructure (Metaverse) The Solipsis project tackles this issue through the use of peer-to-peer technology, and makes it possible to build and manage a world-scale Metaverse in a truly distributed manner Following a peer-to-peer scheme, entities collaborate to build up a common set of virtual worlds In this paper, we present a first draft of the \sol architecture as well as the communication protocol used to share data between peers The protocol is based on Raynet, an n-dimensional Voronoi-based overlay network Its data-dissemination policy takes advantage of the view-depedent representation of 3D contents Moreover, the protocol effectively distributes the execution of computationally intensive tasks that are usually executed on the server-side, such as collision detection and physics computation Finally, we also present our web component, a 3D navigator that can easily run on terminals with scarce resources, and that provides solutions for smooth transitions between 3D Web and Web 20

The UV-induced refractive index grating in Ge: preforms: additional CW experiments and the macroscopic origin of the change in index

Abstract: Bragg gratings have been written within MCVD germanosilicate preform slices using CW laser light at 244 nm. Afterwards, scanning light interferometry was used to perform a 3D imaging analysis of the sample surface topography. The results show that the same process (namely densification) pointed out in a previous work in which we used UV pulsed exposure of preform slices is also active here. A simplified model which assumes that the UV-induced periodic corrugations result from both permanent and elastic strains, is presented. This model accounts not only for a large part of the measured refractive index change but also for the localization of the UV-induced birefringence along the grating wavevector. It also gives a satisfactory interpretation of the observations made by Fonjallaz et al, according to whom grating inscription within a germanosilicate fibre increased the axial tensile core stress.

In-plane polarized intraband absorption in InAs/GaAs self-assembled quantum dots

Abstract: In-plane polarized photoinduced intraband absorption is reported in InAs/GaAs self-assembled quantum dots in the 90--600-meV energy range. This in-plane absorption mainly originates from bound-to-continuum transitions in the conduction and valence bands and lies in the 4--8-\ensuremath{\mu}m spectral range. The continuum is constituted either by the dot quasibound states hybridized with the wetting layer subbands or by the delocalized states of the barriers. A weak in-plane polarized bound-to-bound hole transition is also observed at 11 \ensuremath{\mu}m. Its in-plane absorption cross section is estimated to be around $1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}{\mathrm{cm}}^{2}.$ The energy position of the p-polarized and in-plane polarized intraband transitions is analyzed as a function of the average quantum dot size. An experimental energy diagram of the quantum dots is presented, as deduced from the interband and intraband measurements. The existence, directions, and lengths of the intraband transition dipoles are compared to the ones deduced from the numerical resolution of the three-dimensional effective mass Schr\"odinger equation taking into account the flat lens-shape geometry of the dots.

Telephone apparatus for a prison medium

Abstract: Dispositif telephonique destine au milieu carceral, comprenant au moins une unite de supervision (1) connectee, d'une part a une pluralite de combines telephoniques (2) destines aux detenus, et d'autre part a une pluralite d'autres combines telephoniques (3) destines aux surveillants, l'unite de supervision (1) etant, d'une part parametrable suivant plusieurs modes possibles selon le reglement interne propre a l'etablissement penitentiaire ainsi equipe, de maniere a permettre un controle des acces au reseau telephonique et d'autre part offre a l'Administration ou a l'exploitant la possibilite d'acceder a tout ou partie des fonctions de controle, au niveau de peripheriques optionnels (4), egalement connectes a l'unite de supervision, caracterise en ce que les combines telephoniques destines aux detenus sont du type telephone public a carte (6) a puce. Telephone device for the prison environment, including at least a supervision unit (1) connected on the one hand to a plurality of telephone sets (2) for inmates, and the other to a plurality of other handsets ( 3) for supervisors, the supervisory unit (1) being a configurable share according to several possible modes according to their own internal rules in prison and equipped to allow control of access to the telephone network on the other hand offers the Administration or the operator can access to any or all of the control functions at the level of optional devices (4), also connected to the monitoring unit, characterized in that handsets for inmates are of the public telephone card (6) chip.

Downlink fluid model of CDMA networks

Abstract: Classical CDMA models mostly consider hexagonal networks. In spite of their simplicity, the hexagonal networks need complex calculations. We develop an analytical fluid model of the network, simpler than the hexagonal one. It can provide explicit formulas of capacity. As an application of this model, we indicate the densification problem of a UMTS network which means the increase of the number of base stations in a limited zone to satisfy a traffic need.