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.

Q-switched thulium-doped fiber laser

Abstract: A tunable Q-switched thulium-doped single-mode silica fiber laser is presented for the first time. Its performance is analyzed as a function of pulse repetition rate and pumping power. The optimization of laser parameters resulted in 4 W/1 30 ns, 1 .92-jrm wavelength pulses generated at a 4-kHz repetition rate. From the measured values of small- signal attenuation and intrinsic saturation power, the thulium ion param- eters at the pump and signal wavelength are derived and used in the- oretical modeling of the laser. The moderate power required from the Ti:sapphire pump laser used in the experiment suggests that similar re- suIts can be obtained using a laser diode pump.

Response of a Bloch oscillator to a THz-field

Abstract: In this paper we report on the observation of response of a Bloch oscillator at room temperature to a THz-field of a frequency larger than the Bloch frequency. The oscillator consisted of a semiconductor superlattice structure, with an applied dc voltage giving rise to a dc electron drift current. Submitting the oscillator to a field at a frequency of 3.3 THz caused a sizeable reduction of the current; the THz-field was generated by use of intense THz-radiation pulses focused on an antenna coupled to the superlattice. We attribute the THz-field induced reduction of the current to a frequency modulation of the Bloch oscillations of electrons at the frequency of the THz-field, leading to reduction of the electron drift velocity and, consequently, of the current.

GLONEMO: global and accurate formal models for the analysis of ad-hoc sensor networks

Abstract: We describe an approach for the formal modeling and analysis of ad-hoc sensor networks, at various levels of abstraction. It is global because it takes into account all the following aspects: a precise modeling of the hardware that implements a single node; the protocol layers; the application code; an abstract model of the physical environment as viewed by the sensors. The global model is executable, to enable validation by simulations, but we also aim at analyzing the global model with various formal validation tools (automatic test, runtime verification techniques, model-checking and abstract interpretations). Each technique or tool may need particular abstractions of the model. In this paper, we illustrate the whole approach with a simple model, and show what formal analysis can be performed on the model.

On-chip integration of dipole antenna and VCO using standard BiCMOS technology for 10 GHz applications

Abstract: The study of on-chip integration of a 10 GHz dipole antenna with a VCO using standard BiCMOS7 (0.25/spl mu/m) STm technology has been carried out. The antenna configuration, which has been chosen, is a folded dipole, which allows reducing the chip dimension to 2.7 /spl times/ 4.48 mm/sup 2/. The first measurement results are in rather good agreement with the simulated results. For a RF power injected from VCO to the antenna of -7dBm (90.2mW), the EIRP of antenna is about -15dBm. Thus the estimated value of antenna isotropic gain is about -8dBi. This result is consistent with simulation values of radiation efficiency of the order of 10%.

Method for Transmitting Information for a Collective Rendering of Information on Emotions

Abstract: A method is provided for transmitting information concerning at least two persons. The method for transmitting information inside a group includes at least the following steps: obtaining emotional conditions associated with the persons; converting each of the emotional conditions into condition information; transmitting the condition information to emotion rendering device capable of associating with each person at least two predetermined conditions representative of at least two respective different emotional conditions.