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Title: Multiplexing of polarization-maintaining photonic crystal fiber based Sagnac interferometric sensors
Authors: Fu, HY
Wong, ACL
Childs, P
Tam, HY 
Liao, YB
Lu, C 
Wai, PKA 
Keywords: Crystal whiskers
Discrete wavelet transforms
Fiber optic sensors
Fiber optics
Laser pulses
Mathematical transformations
Issue Date: 12-Oct-2009
Publisher: Optical Society of America
Source: Optics express, 12 Oct. 2009, v. 17, no. 21, 18501-18512 How to cite?
Journal: Optics express 
Abstract: Three multiplexing schemes are presented for polarization-maintaining photonic crystal fiber based Sagnac interferometric sensors. The first technique is wavelength division multiplexing using coarse wavelength division multiplexers (CWDMs) to distinguish signals from each multiplexed sensor in different wavelength channels. The other two schemes are to multiplex sensors in series along a single fiber link and in parallel by using fiber-optic couplers. While for the CWDM scheme, the multiplexed sensing signal can be obtained by direct measurement; for the other two multiplexing techniques, the sensing signal is more complex and cannot be easily demultiplexed. Thus, some signal processing methods are required. In this regard, two mathematical transformations, namely the discrete wavelet transform and Fourier transform, have been independently and successfully implemented into these two schemes. The operating principles, experimental setup, and overall performance are discussed.
ISSN: 1094-4087
DOI: 10.1364/OE.17.018501
Rights: © 2009 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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