Abstract: A line attenuation device for monomode fibers having at least one attenuating element with at least one graded-index multimode fiber section placed between two monomode fibers and coupled to at least one coreless silica fiber section.

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: A method and apparatus for wavelength switching a laser source. An external cavity (2) having a Bragg grating (5) is provided in an optical fiber (4). Space division switching is performed in the external cavity between a plurality of optical fibers (4) each having a different Bragg grating (5). A space division switch (3) is provided in the external cavity for switching between a plurality of optical fibers (4) each carrying a different Bragg grating (5).

Abstract: A method for the collective production of microlenses at the end of a set of aligned optical fibers. The method consists in heating the end of all the fibers by means of an electric arc in order to form the microlenses, the plane in which the ends of the fibers are situated being distant from the line of the hottest points in the electric arc in order to round their end homogeneously. Useful for making optical and optoelectric modules.

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 present invention relates to a method and to Apparatus for wavelength switching a laser source comprising an external cavity (2) having a Bragg grating (5) in an optical fiber (4). The method consists in performing space division switching in the external cavity between a plurality of optical fibers (4) each having a different Bragg grating (5). The apparatus comprises a space division switch (3) in the external cavity for switching between a plurality of optical fibers (4) each carrying a different Bragg grating (5).

Abstract: A device for collective optical coupling between a single-mode fiber bundle and an electronic module in the optical telecommunications field which includes joining the single-mode fiber bundle to a graded-index fiber bundle and fracturing the fibers of the graded-index fiber bundle so as to produce graded-index fiber sections in order to form a lens at each end of the single-mode fibers.