Abstract: A device for multi-plane conversion of a first light radiation having a conversion block comprising a plurality of optical parts and implementing a plurality of phase masks to apply a spatiofrequential phase shift for producing a second light radiation—a predetermined transformation, known as a transformation with separable variables. The predetermined transformation may link N modes of index {i, j}k, 1<=k<=N, of a first used mode family with separable spatial variables (x,y) describing the first light radiation in a first transverse plane with n modes of the same index {i, j}k 1<=k<=N, of a second used mode family with separable spatial variables (x,y) describing the second light radiation at a second transverse plane. The N modes of the second mode family are not Hermite-Gaussian modes. The N modes of the first mode family are not arranged on the first transverse plane in the form of a triangle.

Abstract: A device for connection to an on-board multiplexed network of communication by multi-mode optical fibers for an aircraft, the device comprising a first optical component for modifying the spatial profile of a light beam, comprising a multi-mode optical input terminal configured to be connected to a first multi-mode optical fiber and single-mode optical output terminals, and a second optical component for modifying the spatial profile of a light beam, comprising single-mode optical input terminals and a multi-mode optical output terminal configured to be connected to a second multi-mode optical fiber. It further comprises an optical harness for switching and reassigning a transmission channel including single-mode optical inputs coupled to the single-mode optical output terminals of the first component, single-mode optical outputs coupled to the single-mode optical input terminals of the second optical component, and single-mode waveguides.

Abstract: A device for processing light radiation, comprises: an optical input for receiving an input beam from an optical source and for propagating in the device an input radiation, an optical output for emitting an output beam having predetermined spatial parameters, an MPLC device, which is arranged between the optical input and the optical output, and which is configured to spatially separate, in a separation plane, the input radiation into useful radiation, in a target mode, which is propagated to the optical output and into an interference radiation. The processing device also comprises at least one blocking device for blocking the interference radiation, which blocking device is arranged in the separation plane so that it does not contribute to the output beam.

Abstract: A method for designing a device for multi-plane conversion of light radiation, the device implementing a plurality M of phase masks intercepting the light radiation in order to phase-shift the radiation for applying a predetermined transformation to the light radiation. First and second mode families (u,v) with separable variables (x,y) are defined. A number N of pairs of indices {i,j}k is chosen to form first and second used mode families, respectively, by selecting the modes of index pairs {i,j}k from the first mode family and from the second mode family, respectively. Next, the phase-shift quantities ?1(x,y) are established, the M phase masks making it possible to transform each mode of index pairs {i,j)k of the first used mode family into the mode of the same index pair {i,j}k of the second used mode family. A phase plate may be obtained by means of the design method and used in a multi-plane conversion device.

Abstract: A device is provided for processing a light/optical radiation including at least two reflective optical elements defining a multi-pass cavity so that at least one of the optical elements reflects the light radiation at least twice, at at least two different reflection positions, and including at least one element, called a corrective element, having at least one position, called a corrective position, producing a reflection or a transmission of the optical radiation, and the surface of which is irregular so that the spatial phase profile of the corrective position has a different phase shift for several different reflection/transmission points of the corrective position.