Photonic device comprising: - a support, - an intermediate layer in contact with the support comprising at least one dielectric material, - a first waveguide, - a first to a fifth waveguide section (211, 212, 213, 214, 215) distinct from the first waveguide, the first to the fifth waveguide section succeeding each other while being optically connected two by two, and being optically connected to the first waveguide by at least one of the first and the fifth waveguide sections (211, 215), - a dielectric filling material, to form with the first waveguide and the first to the fifth waveguide sections (211, 212, 213, 214, 215) a wave guiding level of the photonic device, the optical guiding level including a first face through which it is in contact with the intermediate layer and a second face opposite to the first face, - a first dielectric layer comprising a dielectric material, the first dielectric layer covering the optical guiding level on its second face, - a gain structure in contact with the first dielectric layer and comprising at least one gain medium capable of emitting light, the gain structure having a central portion facing the third waveguide section and a first and a second end facing second and fourth waveguide sections (212, 214), thus, the central portion of the gain structure forms with the third waveguide section a laser hybrid waveguide, the second and fourth waveguide sections (212, 214) and the first and second ends of the gain structure forming a first and a second zone of optical transition (312, 314) of an optic mode between the laser hybrid waveguide and respectively the first and the fifth waveguide sections (211, 215), wherein the third section is in contact with the intermediate layer and includes a pattern arranged uniquely in a first part of its thickness, said pattern forming a distributed Bragg grating under the gain structure to form a feedback structure and a resonant cavity including at least one part of the gain medium so doing so as to form a laser optically connected to the waveguide by at least one of the first and the fifth waveguide sections (211, 215), wherein the second and fourth waveguide sections (212, 214) are in contact with the intermediate layer on a part of the intermediate layer which is constituted uniquely of dielectric materials, the photonic device being characterised in that the third waveguide section includes at least one second part of its thickness that separates the first dielectric layer and the first part of the thickness of the third waveguide section. - a support, - an intermediate layer in contact with the support comprising at least one dielectric material, - a first waveguide, - a first to a fifth waveguide section (211, 212, 213, 214, 215) distinct from the first waveguide, the first to the fifth waveguide section succeeding each other while being optically connected two by two, and being optically connected to the first waveguide by at least one of the first and the fifth waveguide sections (211, 215), - a dielectric filling material, to form with the first waveguide and the first to the fifth waveguide sections (211, 212, 213, 214, 215) a wave guiding level of the photonic device, the optical guiding level including a first face through which it is in contact with the intermediate layer and a second face opposite to the first face, - a first dielectric layer comprising a dielectric material, the first dielectric layer covering the optical guiding level on its second face, - a gain structure in contact with the first dielectric layer and comprising at least one gain medium capable of emitting light, the gain structure having a central portion facing the third waveguide section and a first and a second end facing second and fourth waveguide sections (212, 214), thus, the central portion of the gain structure forms with the third waveguide section a laser hybrid waveguide, the second and fourth waveguide sections (212, 214) and the first and second ends of the gain structure forming a first and a second zone of optical transition (312, 314) of an optic mode between the laser hybrid waveguide and respectively the first and the fifth waveguide sections (211, 215), wherein the third section is in contact with the intermediate layer and includes a pattern arranged uniquely in a first part of its thickness, said pattern forming a distributed Bragg grating under the gain structure to form a feedback structure and a resonant cavity including at least one part of the gain medium so doing so as to form a laser optically connected to the waveguide by at least one of the first and the fifth waveguide sections (211, 215), wherein the second and fourth waveguide sections (212, 214) are in contact with the intermediate layer on a part of the intermediate layer which is constituted uniquely of dielectric materials, the photonic device being characterised in that the third waveguide section includes at least one second part of its thickness that separates the first dielectric layer and the first part of the thickness of the third waveguide section.