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Proceedings Paper

Coherence multiplexing of sensors based on long-period fibre grating Mach-Zehnder interferometers
Author(s): Zu-Guang Guan; A. Ping Zhang; Ran Liao; Meng Jiang; Sailing He
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Paper Abstract

A novel interrogation scheme for multiplexing the sensors based on long-period grating (LPG) Mach-Zehnder interferometers (MZIs) is proposed. Each LPG-MZI is formed by a pair of cascaded identical LPGs and induces an additional optical path difference (OPD) proportional to the centre-to-centre interval between the two LPGs. A sub-reflectogram including sensing information can be achieved when the OPD induced in one LPG-MZI is compensated by scanning one arm of a Michelson interferometer to a certain range. For multiple sensors, the grating intervals of different LPG-MZIs are set to different values to ensure that their sub-reflectograms can be well separated in time domain. The spectral response of the LPG-MZI is reconstructed from the corresponding sub-reflectogram with a fast Fourier transformation. Applications of the bending and temperature monitoring are demonstrated by measuring the signals in time domain and wavelength domain, respectively.

Paper Details

Date Published: 5 October 2006
PDF: 9 pages
Proc. SPIE 6351, Passive Components and Fiber-based Devices III, 635124 (5 October 2006); doi: 10.1117/12.688307
Show Author Affiliations
Zu-Guang Guan, Zhejiang Univ. (China)
A. Ping Zhang, Zhejiang Univ. (China)
Ran Liao, Zhejiang Univ. (China)
Meng Jiang, Zhejiang Univ. (China)
Sailing He, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 6351:
Passive Components and Fiber-based Devices III
Sang Bae Lee; Yan Sun; Kun Qiu; Simon C. Fleming; Ian H. White, Editor(s)

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