The All Grating Fiber (AGF®) is an optical fiber containing densely spaced low reflective (R<0.1%) Draw Tower Gratings (DTG®s). The spatial separation from center to center can be as small as 10mm and the FBG length can be chosen such that more than 95% of the fiber contains gratings. The fiber is designed to be used with an OFDR (optical frequency domain reflectometry) system that allows for fast and precise measurements over a wide strain or temperature range with spatial resolution down to a few mm over the entire fiber length.
The Low Bend Loss fiber LBL-1550-125 has a cladding diameter of 125µm and is optimized for operation in the 1550nm wavelength window. The glass composition has also been tuned such that the fiber maintains a good signal transmission under small bending diameters.
The Low Attenuation Loss fiber LAL-1550-125 has a cladding diameter of 125µm and is optimized for operation in the 1550nm wavelength window. The glass composition has also been tuned such that the fiber gives a good compromise between signal transmission under small bending diameters and attenuation.
The Low Bend Loss fiber LBL-1550-80 has a cladding diameter of 80µm and is optimized for operation in the 1550nm wavelength window. The glass composition has also been tuned such that the fiber maintains a good signal transmission under small bending diameters.
|Reflectivity (for grating length of 8mm)||< 0.1%|
|Centre wavelength||1510–1590 nm|
|Absolute wavelength accuracy1||≤ 0.5 nm|
|DTG® length||1–10 mm|
|Attenuation @ 1550 nm||< 8.6 dB/km||< 1 dB/km||< 8.6 dB/km|
|Mode Field Diameter (MFD) @ 1550 nm||6 μm (typical)||7.8 μm (typical)||6 μm (typical)|
|Numerical Aperture (NA)||0.26 (typical)||0.14 (typical)||0.26 (typical)|
|Cladding diameter||125 μm ± 1 μm||80 μm ± 1 μm|
|Coating type2||ORMOCER®/ORMOCER®-T / One layer Acrylate|
|Coated fibre diameter||195 μm (typical)||120 μm (typical)|
|Tensile load at break3||> 50 N (corresponds to > 5% strain)||> 20 N (corresponds to > 5% strain)|
|Temperature sensitivity4 (formula Δλ/(λ ⋅ ΔT))||6.5 K-1 ⋅ 10-6 (typical)|
|Strain sensitivity1 (formula: Δλ/(λ ⋅ Δε))||7.8 με-1 ⋅ 10-7 (typical)|
|Operational temperature range5||-200–200°C for ORMOCER®|
-20–200°C for ORMOCER®-T
-20–90°C for One layer Acrylate
1 measured at room temperature
2 Ormocer® is mainly applied for strain measurements while Ormocer®-T is recommended for temperature measurements.
3 According to IEC-60793-1-31 using a constant displacement of 30mm/minute.
4 measured between 0°C and 70°C
5 temperature range is dependent on exposure time