Fiber sensor technology is one of the key areas of sensor technology. Modern fiber optic cables are increasingly opening up new applications in the field of sensor and illumination technology. Over the past few years, fiber sensors based on integrated Bragg gratings in particular have been frequently used for temperature and strain measurements. The use of laser technology for the functionalization of fiber end surfaces and the optimization of fiber construction and fiber bonding technology opens up a wide range of design possibilities. For example, fibers on the shell surface could be structured in a targeted way using laser beams to use decoupled light for illumination applications or to couple signals into the fiber.