Sistema com Laser Sintoniz´ avel para Caracterizac ¸ ˜ ao de Dispositivos ´ Oticos

This paper describes the implementation of an interrogation system with a tunable Erbium-doped fiber ringlaser. The laser is used to illuminate optical devices like Bragg gratings, so that it can also be used as an interrogation system to determine the spectral characteristics of optical devices. An intra-cavity Fabry-Perot filter tunes the laser and is driven by a voltage ramp generator. The resulting optical signal is captured by a photodetector and analyzed in a computer, that can be used as an optical spectrum analyzer for passive components and as an interrogation system for multiple fiber Bragg grating based sensors. As an application example, the temperature inside a concrete beam, which was under systematic heating and vibrations, has been measured remotely with the system.