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Proceedings Paper

Phase modulation to intensity modulation conversion for sensitive FBG sensor interrogation
Author(s): Javier Hervás; David Barrera; Javier Madrigal; Salvador Sales
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Paper Abstract

An interrogation technique based on phase modulation to intensity modulation conversion due to FBG filtering is presented. A 10 GHz tone is used to phase modulate an optical carrier located at the Bragg wavelength of a given FBG. The modulation index is set to a small value to keep Bessel identities close to 0 in order to avoid higher harmonics. Changes of the Bragg wavelength cause a power change in the photodetected 10 GHz tone. A remarkable linear sensitivity of 1 dB/pm for a shift up to 10 pm of the Bragg wavelength is demonstrated through experimental measurements. The range with linear sensitivity can be enlarged sweeping the source wavelength. This proves that the presented interrogation technique is able to interrogate FBGs with a resolution far below 1 pm and no need of extra postprocessing.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 1032342 (23 April 2017); doi: 10.1117/12.2265400
Show Author Affiliations
Javier Hervás, Univ. Politècnica de València (Spain)
David Barrera, Univ. Politècnica de València (Spain)
Javier Madrigal, Univ. Politècnica de València (Spain)
Salvador Sales, Univ. Politècnica de València (Spain)

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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