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Proceedings Paper

Enhanced fiber Bragg grating sensor demodulation technique using cascade wavelength division multiplex couplers
Author(s): Keke Tian; Songwei Zhang; Fang Li; Yuliang Liu; Qiming Wang
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Paper Abstract

An enhanced technique for interrogating fiber Bragg grating wavelength shift using cascade wavelength division multiplexer(WDM) couplers was proposed and demonstrated. Three WDM couplers which show a linear filter function over the expected wavelength range are employed and cascaded to track Bragg wavelength shifts. Compared with single WDM demodulator, sharper spectral slope is obtained and considerable linear filter range is kept. The static and dynamic strain sensor demodulation experiments demonstrated that the simple passive technique improves the sensitivity approximately two times and keeps 5nm linear demodulation range based on our devices. The cascade WDM coupler demodulation system has high scan rate which can be used to monitor fast vibration.

Paper Details

Date Published: 17 January 2005
PDF: 8 pages
Proc. SPIE 5644, Optoelectronic Devices and Integration, (17 January 2005); doi: 10.1117/12.570135
Show Author Affiliations
Keke Tian, Institute of Semiconductors, CAS (China)
Songwei Zhang, Institute of Semiconductors, CAS (China)
Fang Li, Institute of Semiconductors, CAS (China)
Yuliang Liu, Institute of Semiconductors, CAS (China)
Qiming Wang, Institute of Semiconductors, CAS (China)

Published in SPIE Proceedings Vol. 5644:
Optoelectronic Devices and Integration
Hai Ming; Xuping Zhang; Maggie Yihong Chen, Editor(s)

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