Review of Chirped Fiber Bragg Grating (CFBG) Fiber-Optic Sensors and Their Applications


Citation for "Review of Chirped Fiber Bragg Grating (CFBG) Fiber-Optic Sensors and Their Applications":

Tosi, D. Review of Chirped Fiber Bragg Grating (CFBG) Fiber-Optic Sensors and Their Applications. Sensors 2018, 18, 2147.


  • fiber optic sensors
  • Fiber Bragg Grating (FBG)
  • Chirped Fiber Bragg Grating (CFBG)
  • FBG sensors
  • photosensitivity


Chirped fiber Bragg grating (CFBG) sensors are valuable tools capable of measuring mechanical, thermal, and physical parameters for various applications including healthcare, mechanical engineering, and shock wave analysis.


This article, published in 2018 in the journal Sensors, was written by Daniele TosiThe article reviews Chirped Fiber Bragg Grating (CFBG) sensors, a type of fiber optic sensor used to measure things like temperature and strain.
CFBGs are similar to standard Fiber Bragg Gratings (FBGs), but instead of having a uniform refractive index modulation, CFBGs have a non-uniform modulation. This allows CFBGs to act as a cascade of FBGs with each reflecting a slightly different spectrum. The key advantage of CFBGs is their ability to detect localized changes in strain or temperature along the grating length with millimeter resolution.
Tosi explains that CFBGs are used in a variety of applications like healthcare, mechanical engineering, and shock wave analysis. Some specific examples include:

  • Healthcare: Monitoring temperature during medical procedures like RF thermal ablation and laser ablation.
  • Mechanical Engineering: Detecting cracks in materials like carbon fiber reinforced polymer (CFRP).
  • Shock Wave Analysis: Measuring detonation velocity.

The article discusses several methods for inscribing CFBGs on different types of optical fibers, including standard single-mode fibers (SMF) and polymer optical fibers (POF). Different interrogation techniques and methods for estimating CFBG parameters, such as central wavelength and full-width half-maximum (FWHM) bandwidth, are also presented.
Overall, the article provides a comprehensive overview of CFBG sensors, covering their working principle, inscription methods, interrogation techniques, and applications. Tosi concludes by highlighting future directions for research and development in this field.

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