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.

    Femtosecond FBGUV Written FBG
    Central Wavelength (nm)790–8501500–1600970–1620
    Wavelength Tolerance (nm)±0.3nm (standard)±0.1 (optional)±0.5 (standard)±0.25 (optional)
    Reflectivity (%)<1–>801–99
    FWHM Bandwidth (nm)0.3–10.1–3
    FBG Length (mm)≤1501–25
    FBG ProfileUniform or ApodizedUniform or Apodized
    ChirpNoNot chirped (standard)Chirped (optional)
    FBG ArraysOptionalOptional
    Fiber TypeSM, MMSM, PM
    Fiber Cladding Diameters (μm)125, 80125, 80, 60, 50
    Fiber Core CompositionGermanium DopedPure SilicaGermanium Doped
    Please note: Each parameter is inherently linked, therefore not all values are independently achievable.
    Product Variants Explained
    Femtosecond FBGHigh reliability FBG written with a femtosecond laser.
    UV Written FBGFBG written with a UV laser.
    Central Wavelength (nm) 790 - 850
    1500 - 1600
    Wavelength Tolerance (nm) ±0.3 (standard)
    ±0.1 (optional)
    Reflectivity (%) <1 - >80
    FWHM Bandwidth (nm) 0.3 - 1
    FBG Length (mm) ≤150
    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