3D sensing by capturing depth images, is a key function in numerous emerging applications such as facial recognition, augmented reality, robotics or drones. CEA targets the development of an innovative 3D sensing module, inspired from frequency modulated Lidar, with simultaneous illumination of the whole scene. To miniaturize the system, the proposed PhD will focus on the definition of an optical architecture including integrated optics elements. The objective is the integration of the main optical functions of the system inside the pixel, in particular the coupling of the light retro-reflected by the scene and the heterodyne mixing with a local oscillator. The candidate will identify one or several optimized optical architectures, propose designs and simulate light propagation and interference, participate to the realization in clean room and the electro-optical characterization of the technological building blocks, and validate the proof-of-principle on experimental test bench. The work will be performed in close collaboration with a research team that will develop in parallel a first version of the system in free space. A transfer to the industry is targeted in the end.