An electrically pumped tuneable laser source (100, 100') comprising: - a first optical confinement layer (112, 212) extending along an Oxy reference plane and forming a distributed Bragg reflector for a pump wave at a pump wavelength; - an active layer (113, 213) made of non-linear semiconducting material extending on the first optical confinement layer (112, 212), the average refraction index of the active layer (113, 213) being greater than the average refraction index of the first optical confinement layer (112, 212); - a second optical confinement layer (115, 215) extending on the active layer (113, 213), the average refraction index of the second optical confinement layer (115, 215) being less than the average refraction index of the active layer (113, 213); said laser source (100, 100') comprising: - a base (104, 204) with a first width along an Ox axis; - a ribbon (105, 205) extending on the base (104, 204), said ribbon (105, 205) having a second width along an Ox axis less than said first width; said laser source (100, 100') being characterised in that: - the second width is less than 10 μm; - the active layer (113, 213) comprises at least one plane of quantum boxes (114, 214) capable of emitting a pump wave at a pump wavelength; - the ribbon (105, 205) comprises at least: • the part of the active layer (113, 213) comprising the quantum boxes plane (114, 214); • the second optical confinement layer (115, 215); said ribbon (105, 205) enabling emission, by parametric conversion from the pump wave, of two waves, respectively called the "signal wave" and the "complementary wave",, the second width being chosen to match the phase between the pump wave, the signal wave and the complementary wave. - a first optical confinement layer (112, 212) extending along an Oxy reference plane and forming a distributed Bragg reflector for a pump wave at a pump wavelength; - an active layer (113, 213) made of non-linear semiconducting material extending on the first optical confinement layer (112, 212), the average refraction index of the active layer (113, 213) being greater than the average refraction index of the first optical confinement layer (112, 212); - a second optical confinement layer (115, 215) extending on the active layer (113, 213), the average refraction index of the second optical confinement layer (115, 215) being less than the average refraction index of the active layer (113, 213); - a base (104, 204) with a first width along an Ox axis; - a ribbon (105, 205) extending on the base (104, 204), said ribbon (105, 205) having a second width along an Ox axis less than said first width; - the second width is less than 10 μm; - the active layer (113, 213) comprises at least one plane of quantum boxes (114, 214) capable of emitting a pump wave at a pump wavelength; - the ribbon (105, 205) comprises at least: • the part of the active layer (113, 213) comprising the quantum boxes plane (114, 214); • the second optical confinement layer (115, 215); said ribbon (105, 205) enabling emission, by parametric conversion from the pump wave, of two waves, respectively called the "signal wave" and the "complementary wave",, the second width being chosen to match the phase between the pump wave, the signal wave and the complementary wave. • the part of the active layer (113, 213) comprising the quantum boxes plane (114, 214); • the second optical confinement layer (115, 215);