Optical system comprising a photoelectric transducer coupled to a waveguide, and manufacturing method therefor

An optical system comprising a substrate, a reflective structure, a photoelectric transducer and a waveguide,

• the reflective structure being formed by a cylindro-parabolic pillar disposed on the substrate, the cylindro-parabolic pillar being delimited by a cylindrical surface comprising a parabolic side surface and a planar side surface, and by two planar faces parallel to a plane of the substrate, and comprising:
• a first inner reflection face with a parabolic profile disposed on the parabolic side surface of the cylindrical surface of the reflective structure, the first inner reflection face being defined by a plurality of parabolic sections parallel to the plane of the substrate, each parabolic section being defined by a parabola having an optical axis and a focus and extending from the vertex of the parabola to the straight line perpendicular to the optical axis and passing through the focus,
• a second inner planar reflection face and a third inner planar reflection face disposed on the planar side surface of the cylindrical surface of the reflective structure, the second and third inner planar reflection faces being orthogonal to the plane of the substrate and to the plane including the optical axes of the plurality of parabolic sections and located on either side of said plane including the optical axes at the foci of the plurality of parabolic sections,
• the photoelectric transducer comprising an active region configured to emit light waves or configured to receive light waves, and arranged so that the active region is positioned in the reflective structure, at a part of the foci of the plurality of parabolic sections, the material of the reflective structure being chosen to be transparent to light waves, the waveguide having a proximal end, a distal end and a longitudinal axis parallel to the optical axes of the plurality of parabolic sections, and arranged on the substrate so that the proximal end is adjoining the reflective structure, between the second and third inner planar reflection faces and at the active region.