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 can supply Fiber Bragg Gratings (FBGs) written into our specialty optical fibers for selected customer programmes and applications. These FBGs can support strain, temperature, acoustic, acceleration, chemical and humidity sensing, as well as other demanding measurement requirements.
FBG solutions are developed around the technical, environmental and commercial needs of each programme. Depending on the application, femtosecond or UV laser inscription methods may be specified. Femtosecond-written gratings can support operating temperatures of 700°C and beyond and are well suited to FBG arrays, while UV-written gratings offer excellent spectral performance for less extreme operating environments.
FBG supply is subject to technical and commercial review to ensure the solution is appropriate for the application and programme requirements.
Comparison
| | Femtosecond FBG | UV Written FBG |
|---|---|---|
| Central Wavelength (nm) | 790–8501500–1600 | 970–1620 |
| Wavelength Tolerance (nm) | ±0.3nm (standard)±0.1 (optional) | ±0.5 (standard)±0.25 (optional) |
| Reflectivity (%) | <1–>80 | 1–99 |
| FWHM Bandwidth (nm) | 0.3–1 | 0.1–3 |
| FBG Length (mm) | ≤150 | 1–25 |
| FBG Profile | Uniform or Apodized | Uniform 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 DopedPure Silica | Germanium Doped |
| Please note: Each parameter is inherently linked, therefore not all values are independently achievable. |
Specifications
Product Variants Explained
| Femtosecond FBG | High reliability FBG written with a femtosecond laser. |
| UV Written FBG | FBG written with a UV laser. |