Work Package 4


Any local change in the geometry or the properties of the fiber modifies the propagation of the light in a way that can hardly be accurately predicted. This effect is usually seen as an impairment as it creates unwanted coupling and random fluctuations. However, we can learn the effect of a set of chosen perturbations in order to influence the light propagation to create new types of modulators and multiplexers. Our goal is to fully control the propagation of the light in a multimode fiber by applying and controlling local changes. To test this approach, we will use mechanical actuators to introduce local perturbations. The first objective is to create an all-fiber modulator, i.e. a system that can generate any desired output pattern for one fixed input. The next step is to obtain a mode multiplexer, meaning that different input fields will generate different output profiles.