High-speed and high-resolution interrogation of FBG sensors using wavelength-to-time mapping and Gaussian filters

In this work we report a novel technique for simultaneous high-speed and high-resolution interrogation of fiber Bragg grating (FBG) sensors. The method uses the wavelength-to-time mapping effect in a chromatic dispersive medium and a couple of intensity Gaussian filters. The Bragg wavelength is retr...

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Bibliographic Details
Published in:arXiv.org 2019-09
Main Authors: FernÁndez, Manuel P, Bulus-Rossini, Laureano A, Cruz, JosÉ L, AndrÉs, Miguel V, Costanzo-Caso, Pablo A
Format: Article
Language:English
Subjects:
Bragg gratings
High resolution
High speed
Interrogation
Mapping
Questioning
Sensors
Sidelobes
Wave filters
Waveforms
Online Access:Get full text
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Summary:In this work we report a novel technique for simultaneous high-speed and high-resolution interrogation of fiber Bragg grating (FBG) sensors. The method uses the wavelength-to-time mapping effect in a chromatic dispersive medium and a couple of intensity Gaussian filters. The Bragg wavelength is retrieved by means of the amplitude comparison between the two filtered grating spectrums, which are mapped into a time-domain waveform. In this way, measurement distortions arising from residual power due to the grating sidelobes are completely avoided, and the wavelength measurement range is considerably extended with respect to the previously proposed schemes. We present the mathematical background for the interrogation of FBGs with an arbitrary bandwidth. In our proof-of-concept experiments, we achieved sensitivities of ~20 pm with ultra-fast rates up to 264 MHz.
ISSN:2331-8422
DOI:10.48550/arxiv.1909.08070