Fiber Bragg Grating (FBG)

  • High mechanical strength FBGs
  • Hydrogen darkening resistant variants
  • Radiation-induced attenuation resistant variants
  • UV photodarkening resistant variants
  • Flexible spectral characteristics

Typical Applications:

  • Temperature sensing
  • Strain sensing
  • Hydrophone and geophone acoustic sensing
  • Laser wavelength locking
  • Wavelength division multiplexing

Fibercore supplies Fiber Bragg Gratings (FBGs) written into our specialty optical fibers. These FBGs may be used for strain sensing, temperature sensing, acoustic sensing, accelerometers, chemical sensing, humidity sensing, and many other applications. Fibercore uses a variety of FBG inscription techniques, including femtosecond and UV laser methods, to optimize the FBG performance to the application. The femtosecond method allows operating temperatures up to 700°C and beyond as well as enabling cost-effective FBG arrays. The UV method is optimized for spectral quality in less extreme applications.

Comparison
Model Femtosecond FBG UV Written FBG
Central Wavelength (nm) 790 - 850
1520 - 1590
970 - 1620
Wavelength Tolerance (nm) ±0.2 (standard)
±0.1 (optional)
±0.5 (standard)
±0.25 (optional)
Reflectivity (%) ≤99 1 - 99
FWHM Bandwidth (nm) 0.1 - 3 0.1 - 3
FBG Length (mm) ≤40 1 - 25
FBG Profile Uniformed or Apodized Uniformed or Apodized
Chirp No Not chirped (standard)
Chirped (optional)
FBG Arrays Optional Optional
Fiber Type SM, MM SM, PM
Fiber Cladding Diameters (μm) 125, 80 125, 80, 60, 50
Fiber Core Composition Germanium Doped
Pure Silica
Germanium Doped
Product Variants Explained
Femtosecond FBG High reliability FBG written with a femtosecond laser.
UV Written FBG FBG written with a UV laser.
Central Wavelength (nm) 790 - 850
1520 - 1590
Wavelength Tolerance (nm) ±0.2 (standard)
±0.1 (optional)
Reflectivity (%) ≤99
FWHM Bandwidth (nm) 0.1 - 3
FBG Length (mm) ≤40
FBG Profile Uniformed or Apodized
Chirp No
FBG Arrays Optional
Fiber Type SM, MM
Fiber Cladding Diameters (μm) 125, 80
Fiber Core Composition Germanium Doped
Pure Silica
Technical Bulletins