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Optical fiber refractometer using narrowband cladding-mode resonance shifts.

Chun-Fan Chan1, Chengkun Chen, Amir Jafari

  • 1Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, Canada.

Applied Optics
|February 17, 2007
PubMed
Summary

Short-period fiber Bragg gratings create multiple resonances for precise refractive index sensing. This method accurately measures surrounding medium refractive indices from 1.25 to 1.44.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Fiber Bragg gratings (FBGs) are widely used optical sensing elements.
  • Tilted FBGs offer unique spectral properties for sensing applications.

Purpose of the Study:

  • To investigate the sensing capabilities of short-period fiber Bragg gratings with weakly tilted grating planes.
  • To demonstrate the measurement of refractive index using the spectral shifts of multiple resonances.

Main Methods:

  • Fabrication of short-period fiber Bragg gratings with weakly tilted grating planes using ultraviolet light irradiation through a phase mask.
  • Experimental measurement of transmission spectra to identify multiple strong resonances.
  • Analysis of wavelength separation between resonances to determine the refractive index of the surrounding medium.

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Main Results:

  • Generation of multiple strong resonances in the transmission spectrum of the fabricated gratings.
  • Accurate measurement of refractive indices in the range of 1.25 to 1.44.
  • Achieved refractive index measurement accuracy approaching 1x10(-4).

Conclusions:

  • Short-period fiber Bragg gratings with weakly tilted planes are effective for high-accuracy refractive index sensing.
  • The proposed sensor demonstrates potential for various applications requiring precise optical property measurements.