Refractometer With Etched Chirped Fiber Bragg Grating Fabry-Perot Interferometer in Multicore Fiber

Sema Guvenc Kilic, Yupeng Zhu, Qiwen Sheng, Mehmet Naci Inci, Ming Han

Research output: Contribution to journalArticle

Abstract

We report a sensitive and mechanically robust fiber-optic refractometer with temperature compensation based on a Fabry-Perot interferometer formed by two chirped fiber Bragg gratings on a seven-core multicore fiber. A small part of the fiber cladding at the sensing region is etched to expose the outer cores to the environment. While the optical modes supported by the outer cores are affected by both temperature and refractive index (RI) changes of the surrounding liquid, the optical mode in the central core of the fiber is affected by the temperature changes only. The wavelength shift due to the RI change is obtained by subtracting the wavelength shift of the central core from that of one of the outer cores so that the temperature effect is removed. The demodulation can also remove the errors caused by the wavelength drift of laser. Due to the narrow spectral features of the sensor, the sensor shows a low RI detection limit of 2.4 × 10-6 at a background RI of 1.316 at a wavelength of ∼1550 nm. Because only a small part of the cladding is removed, the sensor maintains excellent mechanical strength and stability.

Original languageEnglish (US)
Article number8648487
Pages (from-to)575-578
Number of pages4
JournalIEEE Photonics Technology Letters
Volume31
Issue number8
DOIs
StatePublished - Apr 15 2019

Fingerprint

Refractometers
refractometers
Fabry-Perot interferometers
Fiber Bragg gratings
Bragg gratings
Refractive index
Wavelength
fibers
Fibers
refractivity
Sensors
wavelengths
Mechanical stability
sensors
Demodulation
Thermal effects
Temperature
Fiber optics
Strength of materials
temperature compensation

Keywords

  • Fabry-Perot interferometers
  • Optical fiber sensors
  • fiber Bragg gratings
  • multicore fibers
  • refractometers

ASJC Scopus subject areas

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

Cite this

Refractometer With Etched Chirped Fiber Bragg Grating Fabry-Perot Interferometer in Multicore Fiber. / Guvenc Kilic, Sema; Zhu, Yupeng; Sheng, Qiwen; Naci Inci, Mehmet; Han, Ming.

In: IEEE Photonics Technology Letters, Vol. 31, No. 8, 8648487, 15.04.2019, p. 575-578.

Research output: Contribution to journalArticle

Guvenc Kilic, Sema ; Zhu, Yupeng ; Sheng, Qiwen ; Naci Inci, Mehmet ; Han, Ming. / Refractometer With Etched Chirped Fiber Bragg Grating Fabry-Perot Interferometer in Multicore Fiber. In: IEEE Photonics Technology Letters. 2019 ; Vol. 31, No. 8. pp. 575-578.
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