Opto-electronic device comprising an integrated laser and an integrated modulator and associated method of production
View Patent ↗The field of the invention is that of integrated optical emission devices comprising a laser emission section and a section for modulating the optical power emitted by the laser, also known as ILM devices, the acronym standing for Integrated Laser Modulator. The invention is aimed at an ILM device comprising a laser section and a modulation section produced in a common structure of P.I.N type, the said structure successively comprising a substrate produced from n-doped semi-conductor material, a buried active zone, a p-doped vertical confinement layer and a semi-insulating lateral confinement layer, the part of the structure belonging to the laser section comprising a blocking layer produced from n-doped semi-conductor material disposed between the semi-insulating lateral confinement layer and the vertical confinement layer so as to reduce the leakage current existing between the said layers. The performance and the reliability of the final device is thus improved.
1. Opto-electronic device, of the type with laser and integrated modulator comprising: a laser section and a modulation section produced in a common structure of P.I.N type, the said structure successively comprising a substrate produced from n-doped semi-conductor material, a buried active zone, a p-doped vertical confinement layer, the lateral faces of the active zone being surrounded by a semi-insulating lateral confinement layer produced from doped semi-conductor material, wherein the part of the structure belonging to the laser section comprises a blocking layer limited to the laser section produced from n-doped semi-conductor material disposed between the semi-insulating lateral confinement layer and the vertical confinement layer, the modulation section not comprising any blocking layer.
2. Opto-electronic device according to claim 1 , wherein the substrate, the vertical confinement layer, the lateral confinement layer and the blocking layer are essentially produced from a first semi-conductor material whose components belong to groups III and V of the periodic table.
3. Opto-electronic device according to claim 1 , wherein the blocking layer is produced from Indium Phosphide (InP) or from InGaAsP (Indium-Gallium-Arsenic-Phosphorus) or from InAlAs (Indium-Aluminium-Arsenic) or from a combination of the family of AIInGaAsP materials.
4. Opto-electronic device according to claim 1 , wherein the active zone is produced from InGaAsP (Indium-Gallium-Arsenic-Phosphorus) or from a combination of the family of AIInGaAsP materials.
5. Opto-electronic device according to claim 1 , wherein the width of the active zone equals about 1 .5 microns and the thickness of the common structure equals a few microns.
6. Opto-electronic device according to claim 1 , wherein the thickness of the blocking layer is less than a micron.
7. Opto-electronic device according to claim 1 , wherein the structure comprises a screen layer disposed between the substrate and the active layer, the said layer also being produced from Indium Phosphorus (InP).