Ultrafast and Ultrahigh-Resolution Interrogation of a Fiber Bragg Grating Sensor Based on Interferometric Temporal Spectroscopy

Wang, Chao and Yao, Jianping (2011) Ultrafast and Ultrahigh-Resolution Interrogation of a Fiber Bragg Grating Sensor Based on Interferometric Temporal Spectroscopy. Journal of Lightwave Technology, 29 (19). pp. 2927-2933. ISSN 0733-8724. (doi:https://doi.org/10.1109/JLT.2011.2164572) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1109/JLT.2011.2164572

Abstract

A novel technique to achieve ultrafast and ultra-high-resolution interrogation of a fiber Bragg grating (FBG) sensor based on interferometric temporal spectroscopy is proposed and experimentally demonstrated. In the proposed system, two FBGs with one serving as the sensor grating and the other serving as the reference grating are connected at two arms of an interferometer. An ultrashort optical pulse from a pulsed laser is sent to the interferometer. Two pulses will be obtained due to the reflection of the two FBGs and then both are sent to a dispersive element to map the sensor grating wavelength shift to a temporal spacing change between the two dispersed pulses due to the dispersion-induced wavelength-to-time mapping. A temporal interference pattern is generated between the temporal pulses. The temporal spacing change is further mapped to the interference pattern frequency change, leading to a greatly improved interrogation resolution due to the inherently high sensitivity of a temporal interferometer. The proposed technique overcomes the fundamental tradeoff between the interrogation speed and resolution in a temporal-spectroscopy-based FBG interrogation system and that between the measurement resolution and dynamic range in a dual-wavelength heterodyne-based interrogation system. An ultrafast real-time interrogation of an FBG strain sensor with a sampling rate of 48.6 MHz and an interrogation resolution as high as 0.61 pm are experimentally demonstrated.

Item Type: Article
Uncontrolled keywords: INSPEC: CONTROLLED INDEXING Bragg gratings fibre optic sensors heterodyne detection high-speed optical techniques light interferometry measurement by laser beam strain sensors INSPEC: NON CONTROLLED INDEXING FBG strain sensor dispersion-induced wavelength-to-time mapping dual-wavelength heterodyne-based interrogation system fiber Bragg grating sensor interference pattern frequency change interferometric temporal spectroscopy ultrafast-resolution interrogation ultrashort optical pulse AUTHOR KEYWORDS Chromatic dispersion fiber Bragg grating (FBG) interferometry interrogation temporal spectroscopy ultrafast ultrahigh resolution wavelength-to-time mapping IEEE TERMS Dispersion Fiber gratings Interference Optical fiber sensors Optical interferometry Optical pulses
Subjects: T Technology
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: Tina Thompson
Date Deposited: 18 Oct 2013 14:21 UTC
Last Modified: 24 Oct 2013 11:26 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/35531 (The current URI for this page, for reference purposes)
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