Fabry-Perot Sensor Using Cascaded Chirped Fiber Bragg Gratings with Opposite Chirp Directions

Yupeng Zhu, Qi Zhang, Guigen Liu, Xiangyu Luo, Ming Han

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We report a fiber-optic strain sensor that can simultaneously achieve high resolution and large dynamic range. The sensor is a fiber-optic Fabry-Perot cavity formed by cascaded high-reflection chirped fiber Bragg gratings with opposite chirp directions. The reflection spectrum of the sensor features a series of narrow spectral notches with unequal spacings. The sensor is demodulated by the wavelength scanning of a distributed feedback laser diode through the current-injection modulation. The narrow spectral notch leads to high measurement resolution; while the unambiguous identification of the spectral notches through their unique spectral spacings results in large measurement range without the need for fringe counting. We have demonstrated a linear axial strain response of the sensor with strain resolution of 0.033~\mu \varepsilon over a range of 1000~\mu \varepsilon .

Original languageEnglish (US)
Article number8399852
Pages (from-to)1431-1434
Number of pages4
JournalIEEE Photonics Technology Letters
Volume30
Issue number16
DOIs
StatePublished - Aug 15 2018

Keywords

  • Fabry-Perot interferometers
  • Optical fiber sensors
  • chirped fiber Bragg gratings
  • distributed feedback lasers
  • strain measurement

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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