An optical fibre connection device comprising, - a metallic prism having a planar base to lay on a composite structure, the prism having an inner conduit connecting opposing lateral surfaces of the prism, the conduit ending in first and second bores (8, 9), the first bore being configured to receive an input optical fiber embedded in the composite structure, - a first connection element having a tubular shaped configuration with inner and outer ends (3a, 3b), the inner end configured to be inserted into the second bore of the prism to receive the input optical fiber, and - a second connection element having a tubular shaped configuration with inner and outer ends (4a, 4b), the inner end configured to be inserted into the first connection element, and the outer end configured to receive an output optical fiber, wherein - the outer end of the first connection element has an inner box configured to receive an outer protruding provided at the inner end of the second connection element to provide a unique position for the connection of the input and output optical fibers (21, 22), and wherein - the inner conduit of the prism comprises two sections (7', 7") following different orientations, said orientations forming a ramp to lead the input optical fiber towards the input and output optical fibers (21, 22) connection, and wherein the optical fibre connection device further comprises: - inner and outer ferrules (11, 12) to respectively receive the input and output optical fiber (21, 22) ends, - the inner and outer ferrules (11, 12) consecutively disposed along the inner end of the second connection element to provide tight connection between the input and output optical fibers (21, 22), and - an elastic element retained into the outer end of the second connection element pressing the inner and outer ferrules (11, 12) together, to thus connect the input and output optical fibers (21, 22), characterized in that it further comprises a closure coaxially disposed around the outer end (4b, 3b) of the second and first connection elements (4, 3) to close the first and second connection elements (3, 4) together. - a metallic prism having a planar base to lay on a composite structure, the prism having an inner conduit connecting opposing lateral surfaces of the prism, the conduit ending in first and second bores (8, 9), the first bore being configured to receive an input optical fiber embedded in the composite structure, - a first connection element having a tubular shaped configuration with inner and outer ends (3a, 3b), the inner end configured to be inserted into the second bore of the prism to receive the input optical fiber, and - a second connection element having a tubular shaped configuration with inner and outer ends (4a, 4b), the inner end configured to be inserted into the first connection element, and the outer end configured to receive an output optical fiber, wherein - the outer end of the first connection element has an inner box configured to receive an outer protruding provided at the inner end of the second connection element to provide a unique position for the connection of the input and output optical fibers (21, 22), and wherein - the inner conduit of the prism comprises two sections (7', 7") following different orientations, said orientations forming a ramp to lead the input optical fiber towards the input and output optical fibers (21, 22) connection, and wherein the optical fibre connection device further comprises: - inner and outer ferrules (11, 12) to respectively receive the input and output optical fiber (21, 22) ends, - the inner and outer ferrules (11, 12) consecutively disposed along the inner end of the second connection element to provide tight connection between the input and output optical fibers (21, 22), and - an elastic element retained into the outer end of the second connection element pressing the inner and outer ferrules (11, 12) together, to thus connect the input and output optical fibers (21, 22), - the outer end of the first connection element has an inner box configured to receive an outer protruding provided at the inner end of the second connection element to provide a unique position for the connection of the input and output optical fibers (21, 22), and wherein - the inner conduit of the prism comprises two sections (7', 7") following different orientations, said orientations forming a ramp to lead the input optical fiber towards the input and output optical fibers (21, 22) connection, and wherein the optical fibre connection device further comprises: - inner and outer ferrules (11, 12) to respectively receive the input and output optical fiber (21, 22) ends, - the inner and outer ferrules (11, 12) consecutively disposed along the inner end of the second connection element to provide tight connection between the input and output optical fibers (21, 22), and - an elastic element retained into the outer end of the second connection element pressing the inner and outer ferrules (11, 12) together, to thus connect the input and output optical fibers (21, 22), - inner and outer ferrules (11, 12) to respectively receive the input and output optical fiber (21, 22) ends, - the inner and outer ferrules (11, 12) consecutively disposed along the inner end of the second connection element to provide tight connection between the input and output optical fibers (21, 22), and - an elastic element retained into the outer end of the second connection element pressing the inner and outer ferrules (11, 12) together, to thus connect the input and output optical fibers (21, 22),