Photonic system comprising a photonic chip and a multi-plane conversion device

A photonic device, comprising:

• a photonic chip extending along a main plane and comprising at least one waveguide arranged in the main plane and at least one transmission zone arranged on a surface of the photonic chip, the waveguide and the transmission zone being optically coupled to each other in order to propagate internal light radiation formed of at least one mode, the internal radiation having a first form at the receiving zone;
• and
• a multi-plane conversion device assembled to the photonic chip and comprising a first optical port, optically associated with the transmission zone in order to receive the internal light radiation, and a second optical port for transmitting external radiation of a given shape, distinct from the first shape, the internal light radiation being capable of propagating from the first optical port to the second optical port during a plurality of reflections and/or transmissions on microstructured zones of the multi-plane conversion device, the microstructured zones being configured to guide the at least one mode of the internal light radiation received at the first optical port and to shape the at least one mode of the internal light into the given shape at the second optical port.