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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 7 — Apr. 2, 2007
  • pp: 3715–3728

Interrogation of fiber Bragg-grating resonators by polarization-spectroscopy laser-frequency locking

G. Gagliardi, S. De Nicola, P. Ferraro, and P. De Natale  »View Author Affiliations

Optics Express, Vol. 15, Issue 7, pp. 3715-3728 (2007)

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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.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(140.2020) Lasers and laser optics : Diode lasers
(260.1440) Physical optics : Birefringence

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: January 8, 2007
Revised Manuscript: February 21, 2007
Manuscript Accepted: February 21, 2007
Published: April 2, 2007

G. Gagliardi, S. De Nicola, P. Ferraro, and P. De Natale, "Interrogation of fiber Bragg-grating resonators by polarization-spectroscopy laser-frequency locking," Opt. Express 15, 3715-3728 (2007)

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