Abstract: The present invention relates to an improved nozzle assembly for the high-frequency dispensing of (small) volumes of a dosing fluid in a container, as well as a dosing system according to the nozzle assembly of the invention. The invention also relates to an improved volumetric device for a dosing system.

Abstract: The invention relates to an interactive multi-user TV method and system and to a TV receiver for using such a method. The invention method consists of broadcasting a TV program (23) and at least one related interactive program (22) to a TV receiver (3), in downloading the sequences of the related interactive program into terminals (4) connected to a mobile telephony network from said TV receiver device (3) according to a client-server configuration and in performing said interactive program sequences by the terminals (4), each of which exchanges data with the TV receiver (3) via a local communication channel (5). Said invention is particularly suitable for interactive services provided by the same TV receiver to a plurality of users located in proximity thereto.

Abstract: Optical fiber having a multimode core (10) comprising:—a first zone (11), which is homogeneous, made of a first material, which has a first refractive index;—a second zone (12) made of at least one second material, which has a second refractive index, which is less than the first index, that second zone (12) being peripherally arranged with respect to the first zone (11), said first and second zones being configured so that the interface between those zones defines, in a transverse plane, a contour which has a star shape such that the multimode transmission characteristics of the fiber are equivalent to those of a graded-index fiber. Application in dual-core amplifying fibers or lasers or in transmission fibers for local networks.

Abstract: The invention relates to an optical fibre having a coating comprising at least two layers (4, 5). The first layer 91) comprises the reaction product of a first composition containing at least one polyether urethane (meth) acrylate oligomer, a first (meth)acrylate monomer and a second (meth) acrylate monomer. The second layer (2) comprises the reaction product of a second composition containing at lest one first polyether urethane (meth)acrylate oligomer, a second epoxy (meth) acrylate oligomer, a first (meth)acrylate monomer and a second (meth)acrylate monomer. The invention also relates to an optical fibre stripping method comprising a step (a) consisting in supplying the inventive optical fibre (1) and the stripping means, a step (b) consisting in bringing the optical fibre (1) and the stripping means into contact with each other, and a step (c) consisting in moving the fibre and the stripping means in relation to one another.

Abstract: Optical fiber having a multimode core (10) comprising:—a first zone (11), which is homogeneous, made of a first material, which has a first refractive index;—a second zone (12) made of at least one second material, which has a second refractive index, which is less than the first index, that second zone (12) being peripherally arranged with respect to the first zone (11), said first and second zones being configured so that the interface between those zones defines, in a transverse plane, a contour which has a star shape such that the multimode transmission characteristics of the fiber are equivalent to those of a graded-index fiber. Application in dual-core amplifying fibers or lasers or in transmission fibers for local networks.

Abstract: A method is provided for producing a fibered element (FO). The method consists in i) forming an assembly (E) by surrounding a first part (C) of vitreous material, with a second part (G) having first optical properties, ii) then drawing the assembly (E) in a longitudinal direction so as to increase its longitudinal dimension while reducing at least one of its transverse dimensions, this increase and reduction being chosen so as to transform at least certain of the said first optical properties of the second part (G) into second optical properties allowing it to selectively filters in a direction substantially perpendicular to the longitudinal direction of the drawn assembly, photons of which the wavelengths fall in at least one selected spectral band.

Abstract: A method of coating an optical fiber includes a step of coating the fiber with a curable coating composition and a step of curing the composition, which contains an unsaturated compound having a double bond and an oxidation catalyst. The curing step includes an in-line first phase consisting in exposing the coated fiber to UV radiation for a time shorter than the time needed for complete curing followed by an off-line second phase consisting in placing the coated fiber in an oxidizing medium in order to complete curing.

Abstract: The present invention relates to an optical fiber (1?) having at least one Bragg grating (11), the fiber comprising a core (2) surrounded successively by cladding (3) and a coating (4), said fiber being obtained by writing said grating in the core and/or the cladding directly through the coating which is made of a material containing an organic substance that is substantially transparent to the ultraviolet type radiation used for writing said grating, wherein the material of said coating contains an inorganic substance that is not miscible with the organic substance and that is distributed in substantially uniform manner in said material.

Abstract: The present invention concerns a method of manufacturing a graded index plastic optical fiber having an index that varies continuously between the center and the periphery of the fiber, from at least one polymer P and at least one reactive diluent D1 to allow the refractive index of said fiber to be varied.

Abstract: An optical fiber includes a primary covering layer, a secondary covering layer transparent to a laser beam, an intermediate covering layer less than 100 nm thick between the primary covering layer and the secondary covering layer and including a coloring element whose coloring properties can be modified by using the laser beam to irradiate the intermediate covering layer to write data.

Abstract: The invention concerns a tunable filter comprising an optical fiber incorporating a Bragg grating on a portion of the fiber. Said fiber portion is coated with a material retained within a confined space and adapted to exert pressure on said Bragg grating to compress said portion of fiber radially and to stretch it longitudinally.

Abstract: The present invention relates to an optical device comprising an ionic conductor and a pair of electrodes, the ionic conductor being made of a material that is transparent to light and contains mobile ions and the electrodes being suitable for absorbing and desorbing the ions and being in ionic contact with the ionic conductor. The refractive index in at least a zone of the ionic conductor can be varied under the effect of the voltage applied between the electrodes. The electrodes contain an electrochemically active material selected from an active carbon, a conductive polymer, and an insertion material suitable for inserting ions in its structure.

Abstract: A method of coating an optical fiber constituted by a doped silica core (1) and by silica cladding (2) consists in surrounding the doped silica core (1) and the silica cladding (2) in coating constituted by a first coating portion (3) of photocurable resin and a second coating portion (4) made by extruding a thermoplastic polymer.

Abstract: The present invention relates to an optical fiber (1?) having at least one Bragg grating (11), the fiber comprising a core (2) surrounded successively by cladding (3) and a coating (4), said fiber being obtained by writing said grating in the core and/or the cladding directly through the coating which is made of a material containing an organic substance that is substantially transparent to the ultraviolet type radiation used for writing said grating, wherein the material of said coating contains an inorganic substance that is not miscible with the organic substance and that is distributed in substantially uniform manner in said material.

Abstract: The present invention concerns a method of manufacturing a graded index plastic optical fiber having an index that varies continuously between the center and the periphery of the fiber, from at least one polymer P and at least one reactive diluent D1 to allow the refractive index of said fiber to be varied.

Abstract: The present invention concerns a method of manufacturing a plastic optical fiber from at least one polymer P, said method being characterized in that said polymer P is a copolymer comprising at least two repeating units P1 and P2 with the following general formulae, i and j corresponding to a repeat number of units: said copolymer P being transparent, amorphous in nature and having a motif P2 content in the range from substantially 30 mole % to 70 mole % when X?F or Cl in P1.

Abstract: A method of coating an optical fiber includes a step of coating the fiber with a curable coating composition and a step of curing the composition, which contains an unsaturated compound having a double bond and an oxidation catalyst. The curing step includes an in-line first phase consisting in exposing the coated fiber to UV radiation for a time shorter than the time needed for complete curing followed by an off-line second phase consisting in placing the coated fiber in an oxidizing medium in order to complete curing.

Abstract: An optical fiber comprises a silica multimode optical core having a refractive index n1 and at least one polymer optical cladding having a refractive index n2, with n1>n2. It further comprises a heterogeneous polymer intermediate optical cladding situated between the multimode core and the optical cladding and having a refractive index substantially equal to the refractive index n1 of the multimode core.

Abstract: The present invention concerns an optical fiber cable including a hydrogen-absorbing composition comprising a catalyst and a hydrogen-absorbing component, characterized in that said hydrogen-absorbing component is a mixture of a non-absorbing polymer matrix and a hydrogen-absorbing organic compound including at least one carbon-carbon triple bond.

Abstract: In a thin conductor cable configured as a flat ribbon cable and surrounded by a common exterior sheath, the plurality of thin conductors are adhesively grouped together using an emulsion polymer.