title: Spectral characterization of integrated acousto-optic tunable filters by means of laser frequency modulation spectroscopy.
abstract: The spectral characteristics of an integrated acousto-optic tunable filter (AOTF) as well as its responsivity to the rf driving signal and sensitivity to temperature changes are experimentally investigated and quantified using a diode-laser-based interrogation system. A spectroscopic technique, exploiting the rf frequency modulation of the laser beam and the phase-sensitive detection of the AOTF transmission, has been used for this purpose. That allows for the generation of a dispersivelike signal, which serves as a reference for tracking any wavelength change of the filter's peak with high resolution. The possibility of using the integrated AOTF as a spectrum analyzer with this interrogation scheme for fiber Bragg grating (FBG) strain sensing is also discussed.
authors.affiliation: CNR-Istituto Nazionale di Ottica Applicata and European Laboratory for Non-Linear Spectroscopy, Naples, Itlay.
authors.forename: Antonio
authors.initials: A
authors.lastname: Di Maio
authors.forename: Mario
authors.initials: M
authors.lastname: Salza
authors.forename: Gianluca
authors.initials: G
authors.lastname: Gagliardi
authors.forename: Pietro
authors.initials: P
authors.lastname: Ferraro
authors.forename: Paolo
authors.initials: P
authors.lastname: De Natale