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Proceedings Paper

DFB laser based electrical dynamic interrogation for optical fiber sensors
Author(s): J. P. Carvalho; O. Frazão; J. M. Baptista; J. L. Santos; A. P. Barbero
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Paper Abstract

An electrical dynamic interrogation technique previously reported by the authors for long-period grating sensors is now progressed by relying its operation exclusively on the modulation of a DFB Laser. The analysis of the detected first and second harmonic generated by the electrical modulation of the DFB Laser allows generating an optical signal proportional to the LPG spectral shift and resilient to optical power fluctuations along the system. This concept permits attenuating the effect of the 1/f noise of the photodetection, amplification and processing electronics on the sensing head resolution. This technique is employed in a multiplexing sensing scheme that measures refractive index variations.

Paper Details

Date Published: 9 May 2012
PDF: 7 pages
Proc. SPIE 8439, Optical Sensing and Detection II, 84390K (9 May 2012); doi: 10.1117/12.922691
Show Author Affiliations
J. P. Carvalho, INESC TEC (Portugal)
FCUP (Portugal)
O. Frazão, INESC TEC (Portugal)
J. M. Baptista, INESC TEC (Portugal)
Univ. of Madeira (Portugal)
J. L. Santos, INESC TEC (Portugal)
Univ. of Madeira (Portugal)
A. P. Barbero, Fluminense Federal Univ. (Brazil)

Published in SPIE Proceedings Vol. 8439:
Optical Sensing and Detection II
Francis Berghmans; Anna Grazia Mignani; Piet De Moor, Editor(s)

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