Abstract: A base for wireless connection of terminals to a communications network, said base including a transmit/receive unit adapted to exchange information with a remote terminal also provided with a transmit/receive unit. The transmit/receive unit of the base includes a transmitter including an extended infrared light source.

Abstract: A controllable source of few photons operating at a predetermined wavelength. The source comprises a solid material (10) having a dilute concentration of elements (11) implanted therein that emit light at said predetermined wavelength, an excitation device (20) for exciting said light-emitting elements, and a probe (30) suitable for capturing, by near field coupling, at least one photon emitted by one of the light-emitting elements. The source is applicable to optical telecommunications.

Abstract: A controllable source of few photons at predetermined wavelength. According to the invention, said source comprises a solid material (10) having a dilute concentration of elements (11) implanted therein that emit light at said predetermined wavelength, an excitation device (20) for exciting said light-emitting elements, and a probe (30) suitable for capturing, by near field coupling, at least one photon emitted by one of the light-emitting elements. The source is applicable to optical telecommunications.

Abstract: An integrated optical component structure designed to operate at a rare earth ion fluorescence wavelength .lambda..sub.1 comprises at least a thin layer of a mixed rare earth fluoride solid solution having the formula (1-x)(M.sub.1-y M'.sub.y F.sub.2)-x TRF.sub.z deposited on a substrate of a monocrystalline semiconductor material where M and M' denote an alkaline earth ion, TRF.sub.z denotes a rare earth fluoride, x is in the range ]0,1[ and y is in the range [0,1]. The component structure finds applications in telecommunications using optical waveguides.

Abstract: A device for the electric characterization of samples, comprises a UHF resonator intended to be coupled locally to the sample. The resonator is formed by a microstrip or triplate line loop (20) carried by a conducting plane (16) and having a gap of small length with respect to the length of the loop and an assembly (32) for receiving the sample in a position in which the sample is coupled selectively to the edges of the gap without being interposed therebetween. The edges of the gap of the loop are fixed to two electrodes of small area passing through a thin plate of dielectric material having a flat face for application against the sample.