Abstract: The invention relates to a hand-held apparatus for emitting intense pulsed light comprising a body configured to be hand held, said body having an aperture accommodating a treatment interface (8) configured to be placed against a skin, the body housing a lamp (14) suitable for emitting a light pulse through the treatment interface in an emission direction, the treatment interface comprising a light guide (10) that protrudes from the body of the hand-held apparatus, the light guide (10) forming a polyhedron having end faces (10a) that are opposite in the emission direction and side faces (10b) joining said end faces, the light guide (10) having a thickness, between the end faces (10a) in the emission direction, larger than 6 mm, and the side faces (10b) having an arithmetic mean roughness Ra lower than or equal to 3.2.

Abstract: The present invention relates to a method of producing an optical filter, characterized in that it comprises effecting the following steps on an optical waveguide (10): controlling the varying interior profile of the waveguide, preferably by melt-drawing, and writing a Bragg grating (20), using techniques allowing independent control of longitudinal variation of the Bragg wavelength and longitudinal variation of the exterior profile of the waveguide.

Abstract: The invention concerns an injection device for optical fibre characterised in that it comprises a main fibre (100), and an auxiliary fibre (200) whereof the beveled end (210) is placed on the edge of the main fibre (10), wherein the auxiliary fibre (200) has a numerical aperture smaller than the numerical aperture of the main fibre (100). The invention also concerns a method for preparing the device.

Abstract: The present invention provides a regenerator device for wavelength division multiplexed optical signals designed to regenerate the N channels of a multiplex simultaneously, the device being characterized in that it comprises at least one regenerator component (112, 152) suitable for coupling the inlet signal with a multiplex of N optical carriers, the regenerator component (112, 152) being constituted by a material presenting a spectrum line with non-uniform broadening so that there is no interaction between the various channels involved within the component.

Abstract: The invention concerns a method for restoring the coating of a previously stripped optical fibre, characterised in that it comprises steps which consist in: applying a drop of viscous substance on one end of the fibre (10) stripped zone, at the interface (22) with the remaining initial coating (20), and shaping said drop into a mass (30) centre on the fibre (10) axis, tapering away from the adjacent initial coating (20), before filling up the fibre stripped space with a mass of substance capable of sheathing said fibre (10) again.

Abstract: An optical fiber for producing energy-dissipative and wavelength—selective filters is presented. The fiber includes a core and a cladding that are photosensitive to radiation and have a periodic perturbation of the refractive index. The periodic perturbation defines at least one Bragg grating with lines tilted with respect to the axis of the fiber. The refractive index difference between the core and the cladding is less than 3×10−3.