High-frequency fiber Bragg grating sensing interrogation system using Sagnac-loop-based microwave photonic filtering

Hongyan Fu, Wei Zhang, Chengbo Mou, Xuewen Shu, Lin Zhang, Sailing He, Ian Bennion

Research output: Contribution to journalArticle

Abstract

A novel high-frequency fiber Bragg grating (FBG) sensing interrogation system by using fiber Sagnac-loop-based microwave photonic filtering is proposed and experimentally demonstrated. By adopting the microwave photonic filtering, the wavelength shift of sensing FBG can be converted into amplitude variation of the modulated electronic radio-frequency (RF) signal. In the experiment, the strain applied onto the sensing FBG has been demodulated by measuring the intensity of the recovered RF signal, and by modulating the RF signal with different frequencies, different interrogation sensitivities can be achieved.
Original languageEnglish
Pages (from-to)519-521
Number of pages3
JournalIEEE Photonics Technology Letters
Volume21
Issue number8
DOIs
Publication statusPublished - 15 Apr 2009

Bibliographical note

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Keywords

  • chirped fiber Bragg grating
  • CFBG
  • microwave photonics
  • Sagnac loop
  • strain sensor

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