Open AccessInterrogation of fiber Bragg-grating resonators by polarization-spectroscopy laser-frequency locking
Author(s) -
G. Gagliardi,
S. De Nicola,
Pietro Ferraro,
P. De Natale
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.003715
Subject(s) - optics , fiber bragg grating , materials science , resonator , fiber laser , laser , phosfos , polarization maintaining optical fiber , distributed feedback laser , optoelectronics , optical fiber , semiconductor laser theory , polarization (electrochemistry) , fiber optic sensor , physics , chemistry
We report on an optically-based technique that provides an efficient way to track static and dynamic strain by locking the frequency of a diode laser to a fiber Bragg-grating Fabry-Pérot cavity. For this purpose, a suitable optical frequency discriminator is generated exploiting the fiber natural birefringence and that resulting from the gratings inscription process. In our scheme, a polarization analyzer detects dispersive-shaped signals centered on the cavity resonances without need for additional optical elements in the resonator or any laser-modulation technique. This method prevents degradation of the resonator quality and maintains the configuration relatively simple, demonstrating static and dynamic mechanical sensing below the picostrain level.