In this letter, we propose and experimentally demonstrate an efficient and scalable photonic superstructure employed for ultrawideband (UWB) pulses modulation purposes. This design is based on the combination of a phase modulation to intensity modulation stage with a customized pulse shaper. Pulse shaping is achieved by means of a photonic structure composed by concatenated fiber Bragg gratings. The proposed scheme holds the capacity of generating high-order UWB signals, a feature that enables the implementation of widely employed modulation formats such as: pulse position modulation, pulse shape modulation, and bi-phase modulation. Theoretical and experimental measurements are exposed to sustain the validity of this system. This work was supported in part by the Ministerio de Ciencia y Tecnologia under Grant TEC2014-60378-C2-1-R and Grant TEC2014-58048-C2-2-P and in part the Regional Project PROMETEO FASE II/2013/012 through the Generalitat Valenciana. Moreno, V.; Mora Almerich, J.; Barrera Vilar, D.; Muriel, M.; Capmany Francoy, J. (2016). UWB Pulses Generation and Modulation Through a Customized FBG-Based Photonic Device. IEEE Photonics Technology Letters. 28(21):2319-2322. doi:10.1109/LPT.2016.2592920