The featured FemtoSecond Grating (FSG®) is a fiber Bragg grating fabricated with ultra-short laser pulses, using an exclusive special through-the-coating inscription method. The inscribed FSG® maintains the untouched high strength of the optical fiber and incorporates new performance features.
FSG®s written in polyimide coated low attenuation fiber.
The FSG-A01 is a uniform apodized grating written into a high-strength 125 μm (cladding diameter) polyimide coated optical fiber, enhanced for functioning in the 1550 nm wavelength window.
| Parameter |
FSG-A01 |
| Reflectivity |
≥ 50% |
| FWHM (Typical value) |
300 pm |
| Centre wavelength |
1510 nm to 1590 nm |
| Absolute wavelength accuracy |
≤ 0.5 nm |
| Relative wavelength accuracy |
≤ 0.3 nm |
| Birefringence effect (Typical value) |
< 8 pm |
| Grating length |
~ 4 mm |
| Grating type |
Uniform apodized |
| Side Lobe Suppression ratio (Typical value) |
≥ 10 dB |
| Grating separation (center to center) |
≥ 5 mm |
| Fiber coating |
Polyimide |
| Core diameter |
10.4 μm |
| Cladding diameter |
125 μm |
| Coating diameter |
155±5 μm |
| Numerical Aperture |
0.11-0.14 |
| Fiber attenuation |
≤0.6 dB/km |
| Temperature Operating range |
-55 to 300 °C |
| Typical Tensile strength FSG according to IEC60793 @ 30 mm/min |
> 4 GPa
(> 5% strain) |