Communication system comprising an optical fiber assembly, a modulated light signal receiver and a telescope

A communication system comprising an optical fiber assembly, a modulated light signal receiver and a telescope, the modulated light signal receiver being positioned at a receiving end of the optical fiber assembly, the telescope being positioned at a collecting end of the optical fiber assembly, the modulated light signal receiver being arranged to receive uplink modulated light signals collected by the telescope and travelling in the optical fiber assembly, the telescope comprising an optical concentrator having an inlet face and an outlet face with a surface area smaller than that of the inlet face, the telescope further comprising a gradient-index lens disposed with respect to the optical concentrator so that an inlet face of the gradient-index lens extends opposite the outlet face of the optical concentrator, the collecting end of the optical fiber assembly opening out opposite an outlet face of the gradient-index lens.