Microwave Photonics Filtering Technique for Interrogating a Very-Weak Fiber Bragg Grating Cascade Sensor

A system to interrogate photonic sensors based on a very weak fiber Bragg grating cascade fiber is presented and experimentally validated and dedicated to detecting the presence and location of a spot event. The distributed sensor proposed consists of a 5-m-long fiber, containing 500 9-mm-long Bragg...

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Bibliographic Details
Published in:IEEE photonics journal 2014-12, Vol.6 (6), p.1-10
Main Authors: Ricchiuti, A. L., Hervas, J., Barrera, D., Sales, S., Capmany, J.
Format: Article
Language:English
Subjects:
Bragg gratings
Cascades
Discrete-time sensor
fiber Bragg gratings
Fiber gratings
fiber optic sensors
Fibers
Microwave filters
Microwave photonics
microwave photonics filters
Modulators
Optical fiber sensors
Optical filters
Photonics
Sensors
Spots
weak FBGs
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Description
Summary:A system to interrogate photonic sensors based on a very weak fiber Bragg grating cascade fiber is presented and experimentally validated and dedicated to detecting the presence and location of a spot event. The distributed sensor proposed consists of a 5-m-long fiber, containing 500 9-mm-long Bragg gratings with a grating separation of 10.21 mm. The principle of operation is based on a technique used to analyze microwave photonics filters. The detection of spot events along the sensor is demonstrated with remarkable accuracy under 1 mm, using a photodetector and a modulator with a bandwidth of only 500 MHz. The simple proposed scheme is intrinsically robust against environmental changes and is easy to reconfigure.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2014.2363443