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Fiber grating sensor demodulation method based on polarization interference

Yu Chong-Xiu Wang Kui-Ru Zhao De-Xin Lin Mei-Mei Li Cheng Zhang Jin-Long

Fiber grating sensor demodulation method based on polarization interference

Yu Chong-Xiu, Wang Kui-Ru, Zhao De-Xin, Lin Mei-Mei, Li Cheng, Zhang Jin-Long
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  • Abstract views:  3099
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Publishing process
  • Received Date:  14 June 2008
  • Accepted Date:  06 November 2008
  • Published Online:  05 March 2009

Fiber grating sensor demodulation method based on polarization interference

  • 1. (1)北京邮电大学电子工程学院,北京 100876; (2)北京邮电大学电子工程学院,北京 100876;河南大学物理与电子学院,开封 475001

Abstract: A novel wavelength shift detection scheme for use in fiber Bragg grating sensing systems is proposed. The structure of the polarization maintaining fiber loop mirror is studied and its theoretical model is established. In addition, the distribution characteristics of the input light wavelength and the output power are analysed. Moreover, numerical simulation and experimental validation are also performed. The results show that the device has simple structure, high stability and high detection precision. The measuring range and the precision can be adjusted by varying the parameters of the fiber loop mirror. In the demodulation range larger than 1 nm, the average precision of the wavelength demodulation is lower than 1 pm.

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