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
| | 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. |
Product Specifications
| 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 |
Resources
Technical Bulletins File fiber_bragg_gratings_md54.6.pdf