Abstract: An optical collimator for single mode fibers includes a fiber segment (S1) with mode expansion including an entry and an exit for a light beam. The entry of the fiber segment with mode expansion is on the side at which the core diameter is the smallest, and the exit is on the side at which the core diameter is the largest. The collimator further includes a fiber segment (S2) with expansion holding coupled to the exit, the core diameter of which is equal to or greater than the largest core diameter of the fiber segment with mode expansion, so that the diameter of the light beam guided for this segment is kept constant.

Abstract: The invention concerns a switch for optical beams comprising a series of optical input channels (110 . . . 150) and a series of optical output channels (410 . . . 450), two liquid crystal cells respectively adapted to deflect an optical beam coming out of an input channel (110 . . . 150) or arriving onto an output channel (410 . . . 450), said two cells comprising each a series of electrodes adapted to orient liquid crystals when one such electrode is subjected to a supply voltage said electrodes being distributed in zones (210 . . . 250, 310 . . . 350), each zone corresponding to a single input channel (110 . . . 150) or a single output channel (410 . . . 450), the switch further comprising means for supplying the electrodes with selected voltages. The invention is characterised in that it comprises a series of separate electronic circuits, each being connected to at least a different zone (210 . . .

Abstract: Liquid crystal device for the space modulation of light having at least one control electrode structured in the form of a first active matrix defining a plurality of first elementary zones, and at least one counter-electrode which is structured in the form of a second active matrix defining a plurality of second elementary zones. Also disclosed is a method of liquid crystal space modulation of light.

Abstract: The invention concerns a switch for optical beams comprising a series of optical input channels (110 . . . 150) and a series of optical output channels (410 . . . 450), two liquid crystal cells respectively adapted to deflect an optical beam coming out of an input channel (110 . . . 150) or arriving onto an output channel (410 . . . 450), said two cells comprising each a series of electrodes adapted to orient liquid crystals when one such electrode is subjected to a supply voltage said electrodes being distributed in zones (210 . . . 250, 310 . . . 350), each zone corresponding to a single input channel (110 . . . 150) or a single output channel (410 . . . 450), the switch further comprising means for supplying the electrodes with selected voltages. The invention is characterised in that it comprises a series of separate electronic circuits, each being connected to at least a different zone (210 . . .

Abstract: The invention concerns an optical switch for optical beams comprising a series of optical input channels (110) and a series of optical output channels (210), two optical index spatial modulating cells (300, 400) adapted to respectively deflect an optical beam coming out of an input channel and arriving onto an output channel, each series of optical channels (110, 210) being distributed according to two dimensions transverse to the direction of the channels and the index spatial modulating cells (300, 400) being each designed to produce deflections according to said two dimensions.

Abstract: The invention concerns an optical collimator for monomode fibres, characterised in that the collimator comprises a fibre section with mode expansion (S1) and a fibre section with expansion maintenance (S2). The invention is applicable to monomode optical fibres with extended field.

Abstract: The invention concerns an optical switch for optical beams comprising a series of optical input channels (110) and a series of optical output channels (210), two optical index spatial modulating cells (300, 400) adapted to respectively deflect an optical beam coming out of an input channel and arriving onto an output channel, each series of optical channels (110, 210) being distributed according to two dimensions transverse to the direction of the channels and the index spatial modulating cells (300, 400) being each designed to produce deflections according to said two dimensions.

Abstract: The method of manufacturing optical fiber arrays comprises the steps consisting in: placing optical fibers in an enclosure in the form of a deformable parallelogram, the fibers being in an array of rows and of columns that are at an angle relative to the rows; and deforming the enclosure so as to vary the angle.

Abstract: A photorefractive apparatus is exposed to a write beam or radiation for creating a system of interference fringes in the apparatus, as well as to a read beam or radiation which diffracts the system created and includes at least one elementary pattern (1) having an electrooptical material (6) with a high electrooptical coefficient with respect to the read radiation, which is transparent to the read radiation and which is surrounded by photoconductive materials (2, 4). The photoconductive materials are transparent to the read radiation and under the effect of the write radiation are able to respectively produce electrons and holes having a high mobility. Application to the optical processing of signals.

Abstract: An optical operator designed to be subjected to write radiation for processing read radiation that it receives, the operator comprising an electro-optical material (Q2), first and second materials (Q1, Q3) distributed on either side of the electro-optical material (Q2), said first and second materials (Q1, Q3) being collection quantum wells. Quantum barrier forming materials (6, 8) are interposed between said two materials (Q1, Q3) and the electro-optical material (Q2), with one of the quantum barrier forming materials (6) constituting a filter such that charges of a certain sign photoexcited by the write radiation in a material (4, Q1) on one side of said filter pass through it in the absence of an external electric field to relax in the collection quantum well (Q3) situated on the other side of the filter (6), while charges of opposite sign are blocked by the filter (6) in the other collection well (Q1).