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Technological Training


Fiber Bragg Grattings for Applications to Optical Communications and Sensors


A fiber Bragg grating is a short section of optical fiber in which the core refractive index has a periodic modulation. They are produced by exposing a photosensitive fiber to a periodic pattern of ultraviolet (UV) light. Their fundamental property is to reflect light over a narrow spectral range centered at a resonant wavelength known as the Bragg wavelength, lB = 2× L× neff, where L is the period of the index modulation (or grating pitch) and neff is the effective refractive index of the fiber mode. Their reflection spectra have shape similar to the "sinc2" function and are characterized by the grating FWHM (full-width at half-maximum) bandwidth, B3dB, and peak reflectivity, Ro, which are function of the grating length, the amplitude of its index modulation and the Bragg wavelength. Fiber Bragg Gratings can be used to reflect, filter or disperse light within an optical fiber. Their ease of fabrication and use combined with their unique properties and great advantages make them ideal for a great number of applications in telecommunications, fiber sensors and lasers. In this tutorial course, we explore all aspects related to this revolutionizing device. Its principles, fabrication techniques, types, apodization, theory and modelling, recent technological advances and applications to fiber amplifiers, lasers, WDM devices, filters, taps, dispersion compensators and sensors are covered.


  • Introduction & Optical Filters
  • FBG Basics
  • FBG Manufacturing
  • FBG Characteristics
  • FBG Types
  • Telecommunication and Sensor Applications
  • Chirped Fiber Gratings (CFG)
  • CFG Operational Principles
  • CFG Applications
  • Manufacturing
  • Theorical Modelling
  • CFG Characterization and Measurements
  • Optical Communication Systems Application
  • Broadband Operation in DWDM Systems
  • FBG-Based Devices Development
  • Conclusions

Duration: 4 Hours

Instructor: Dr. Sérgio Barcelos