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Writing Bragg Gratings in Multicore Fibers
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Wavelet-Based Demodulation of Multimode Etched Fiber Bragg Grating Refractive Index Sensor.

Takhmina Ayupova1, Marzhan Sypabekova2,3, Carlo Molardi4

  • 1National Laboratory Astana, Laboratory of Biosensors and Bioinstruments, 010000 Astana, Kazakhstan. takhmina.ayupova@nu.edu.kz.

Sensors (Basel, Switzerland)
|December 26, 2018
PubMed
Summary

This study introduces a novel wavelet-domain analysis for multimode etched fiber Bragg grating (MMEFBG) sensors. The method enhances refractive index detection by analyzing spectral density, overcoming limitations of traditional wavelength shift methods.

Keywords:
Evanescent field sensorsfiber Bragg grating (FBG)optical fiber sensor (OFS)refractive index sensorswavelet density estimation

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Area of Science:

  • Photonics and Optical Sensing
  • Nanotechnology and Material Science

Background:

  • Etched fiber Bragg grating (EFBG) sensors are utilized for refractive index detection via evanescent fields.
  • Increased sensitivity in thin fibers leads to multimode behavior and spectral enlargement, complicating sensor interrogation.

Purpose of the Study:

  • To develop an advanced spectral analysis method for multimode etched fiber Bragg gratings (MMEFBGs).
  • To improve refractive index sensing by analyzing spectral density, independent of peak reflectivity.

Main Methods:

  • Analysis of MMEFBG spectra in the wavelet domain.
  • Utilizing the integral of spectral density as a novel sensing estimator.
  • Fabrication of MMEFBGs using hydrofluoric acid and testing with water/sucrose mixtures.

Main Results:

  • The wavelet-domain analysis effectively quantifies spectral density, offering a new approach to MMEFBG interrogation.
  • The proposed spectral density integral estimator demonstrates superior performance compared to conventional wavelength shift methods.
  • Refractive index sensitivity was successfully evaluated, validating the efficacy of the developed interrogation technique.

Conclusions:

  • The wavelet-based spectral density analysis provides a robust method for interrogating MMEFBGs.
  • This approach effectively leverages the spectral enlargement characteristic of multimode sensors for enhanced refractive index sensing.