Over the past decade, Additive Manufacturing has made tremendous progress. In particular, the applications of Laser Powder Bed Fusion (LPBF) have dramatically increased due to its ability to manufacture complex shapes as lattice structures. In parallel, fiber optic sensors have demonstrated their ability to measure physical parameters such as temperature or stress inline. Recent studies suggest the possibility of inserting optical fiber-based sensors in LPBF parts. This allows the sensor to be located in the desired position within the complex structure during manufacturing.  Three types of optical fiber sensors are considered  Fabry-Pérot interfermetry, Bragg gratings, Rayleigh detection. After briefly presenting the position of the study and optical fiber sensors, the presentation introduces the proposed approach for inserting the sensors during LPBF manufacturing and the related experiments. A particular design of the cavity to place the sensor is proposed. A particular local scanning strategy is used to limit as much as possible the thermal effect induced by the laser scanning around the fiber. The results show the quality of the integration and the impact on the mechanical properties of the parts. Three examples of possible applications in nuclear field are given : control of integrity of lattice structure shock absorber, new design are control of lattice structure in W/Cu interface, inline detection of radiation of different types.