Abstract: An optical probe that measures the level of a liquid in a tank includes a transparent and refracting optical waveguide for receiving an injection of a collimated light beam. The optical waveguide internally reflects the collimated light beam according to a total reflection regime in any part of the optical waveguide located in a gaseous medium and refracts the collimated light beam according to a refraction regime in any part of the optical waveguide immersed in a liquid medium. The optical waveguide switches from the total reflection regime to the refraction regime at the interface between the gaseous medium and the liquid medium, and mirrors are arranged around said optical waveguide and reverse the path of a light beam collimated and refracted by the optical waveguide, the optical path covered by the collimated light beam representing the level of the liquid in the tank.

Abstract: The invention concerns an embedded optical ring communication network (10) suitable for transmitting data between equipment (12a-12h), characterised in that it comprises an assembly of distribution boxes (14a-14h) each connected to two other distribution boxes (14a-14h) by multimode bidirectional optical fibres (16a-16h) so as to form a ring, suitable for also being connected to a multiplexer/demultiplexer (18a, 18b, 18c) by multimode bidirectional optical fibres, and in that each optical fibre (16a-16h) is suitable for transporting optical signals of at least three different modes (32, 32, 34).

Abstract: An optical probe that measures the level of a liquid in a tank includes a transparent and refracting optical waveguide for receiving an injection of a collimated light beam. The optical waveguide internally reflects the collimated light beam according to a total reflection regime in any part of the optical waveguide located in a gaseous medium and refracts the collimated light beam according to a refraction regime in any part of the optical waveguide immersed in a liquid medium. The optical waveguide switches from the total reflection regime to the refraction regime at the interface between the gaseous medium and the liquid medium, and mirrors are arranged around said optical waveguide and reverse the path of a light beam collimated and refracted by the optical waveguide, the optical path covered by the collimated light beam representing the level of the liquid in the tank.

Abstract: The invention concerns an embedded optical ring communication network (10) suitable for transmitting data between equipment (12a-12h), characterised in that it comprises an assembly of distribution boxes (14a-14h) each connected to two other distribution boxes (14a-14h) by multimode bidirectional optical fibres (16a-16h) so as to form a ring, suitable for also being connected to a multiplexer/demultiplexer (18a, 18b, 18c) by multimode bidirectional optical fibres, and in that each optical fibre (16a-16h) is suitable for transporting optical signals of at least three different modes (32, 32, 34).