Long fiber Bragg grating sensor interrogation using discrete-time microwave photonic filtering techniques

A novel technique for interrogating photonic sensors based on long fiber Bragg gratings (FBGs) is presented and experimentally demonstrated, dedicated to detect the presence and the precise location of several spot events. The principle of operation is based on a technique used to analyze microwave photonics (MWP) filters. The long FBGs are used as quasi-distributed sensors. Several hot-spots can be detected along the FBG with a spatial accuracy under 0.5 mm using a modulator and a photo-detector (PD) with a modest bandwidth of less than 1 GHz. The proposed interrogation system is intrinsically robust against environmental changes.


Published in:
Optics Express, 21, 23, 28175-28181
Year:
2013
Publisher:
Optical Society of America
ISSN:
1094-4087
Keywords:
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 Record created 2013-11-26, last modified 2018-10-01

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