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3 March 2017 Dynamic fiber Bragg grating sensor array with increased wavelength-division multiplexing density and low crosstalk
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Abstract
This paper describes a dense wavelength-division multiplexing scheme with low crosstalk for fiber Bragg grating (FBG) sensors based on interferometric detection. The scheme uses a 100-GHz spacing dense wavelength-division multiplexer with two-level optical filters to separate the returned wavelengths from FBG sensor array, enabling a high-resolution interferometric dynamic wavelength demodulation for each sensor with narrow spacing. An array with three gratings was demonstrated, and a dynamic wavelength resolution of 7×104  pm/Hz was tested, with a bandwidth of 1 Hz to 1 kHz for each sensor. The FBGs have an operating range approaching 0.6 nm with a crosstalk level below 80  dB. The multiplexing scheme demonstrates the potential to address up to 50 FBG sensors through a single fiber with a 40-nm bandwidth optical source.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2017/$25.00 © 2017 SPIE
Faxiang Zhang, Chang Wang, Shaodong Jiang, Xiaolei Zhang, Zhihui Sun, Jiasheng Ni, and Gangding Peng "Dynamic fiber Bragg grating sensor array with increased wavelength-division multiplexing density and low crosstalk," Optical Engineering 56(3), 037101 (3 March 2017). https://doi.org/10.1117/1.OE.56.3.037101
Received: 22 December 2016; Accepted: 16 February 2017; Published: 3 March 2017
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