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Proceedings Paper

Calibration method of optical signal long-distance transmission delay for wavelength-swept lasers based FBG demodulation system
Author(s): Muye Liu; Zhengying Li; Zhiqiang Xu; Quan Liu
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Paper Abstract

Long distance optical fiber between fiber bragg gratings (FBGs) and demodulation system cause demodulation wavelength error to wavelength-swept lasers based FBG demodulation system because of the optical signal transmission delay. This paper proposes a calibration method which works with three steps: original demodulation data acquisition, FBG spectral section find and calibration parameter calculation to eliminate error. System obtains the central wavelength of FBG sensors with the calibration parameters adaptively. Experiment process with 10 Km distance optical fiber between ten cascaded FBGs and demodulation system. Results show that the wavelength error up to about 50nm under 4 KHz demodulation rate and about 20nm under 2 KHz demodulation rate without calibration. Eliminating by the proposed method, wavelength error down to about 10pm which allowed by system. Processing the method periodically, demodulation system is able to auto-adapt to the change of application environment factors of long distance multi-point distributed FBG sensors network, and implements large capacity and high speed demodulation. Keywords: wavelength-swept lasers, fiber bragg grating sensor, demodulation system, long distance, optical signal transmission delay, calibration method, high speed, large capacity.

Paper Details

Date Published:
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Proc. SPIE of200, OFS2013 23rd International Conference on Optical Fiber Sensors 2, ; doi: 10.1117/12.2059004
Show Author Affiliations
Muye Liu, Key Lab. of Fiber Optic Sensing Technology and Information Processing (China)
Wuhan Univ. of Technology (China)
Zhengying Li, Key Lab. of Fiber Optic Sensing Technology and Information Processing (China)
Wuhan Univ. of Technology (China)
Zhiqiang Xu, Key Lab. of Fiber Optic Sensing Technology and Information Processing (China)
Wuhan Univ. of Technology (China)
Quan Liu, Key Lab. of Fiber Optic Sensing Technology and Information Processing (China)
Wuhan Univ. of Technology (China)


Published in SPIE Proceedings Vol. of200:
OFS2013 23rd International Conference on Optical Fiber Sensors 2
Jesus M. Mirapeix Serrano; Manuel López-Amo; José M. López-Higuera; José M. López-Higuera; Julian D. C. Jones, Editor(s)

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