All Grating Fibers (AGF^®)

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.

Home Components Component: All Grating Fibers (AGF^®)

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.

AGF-LBL-1550-125

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 so that the fiber maintains a good signal transmission under small bending diameters.

AGF-LAL-1550

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 so that the fiber gives a good compromise between signal transmission under small bending diameters and attenuation.

AGF-LBL-1550-80

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 so that the fiber maintains a good signal transmission under small bending diameters.

Parameter	AGF-LBL-1550-125	AGF-LAL-1550	AGF-LBL-1550-80
Reflectivity (for grating length of 8mm)	< 0.1%
Centre wavelength	1510–1590 nm
Absolute wavelength accuracy¹	≤ 0.5 nm
DTG^® length	2–10 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

More All Grating Fibers (AGF®)

Long range sound sensitive All Grating Fiber (soundAGF^®)

The soundAGF^® is a special designed All Grating Fiber for long-range DistributedAcoustic Sensing (DAS) applications.

Draw Tower Gratings (DTGs) are produced using a process that combines the drawing of the optical fiber with the writing of the grating. The input of the process is a glass preform. After heating the preform, the pulling and formation of the fibre will be initiated. Further in the production process, the fiber crosses the optical axis of a laser and the interferometer that create a periodical UV-light interference pattern in order to write the grating. Using a pulse selector and taking into account the draw speed, FBGs can be accurately positioned in the fiber. When the grating has been written the fiber is coated by entering a coating reservoir, followed by a curing step of the coating. Finally the location of the DTG is marked automatically and the fiber is reeled onto a drum. This process of simultaneously drawing the fiber, writing the grating and coating the fiber directly after the grating inscription, results in high strength grating chains. As such the commonly used stripping and recoating process of standard FBGs is not necessary and the pristine fiber strength is maintained during the DTG manufacturing process.

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Our components

Draw Tower Gratings (DTG^®)

FemtoSecond Gratings (FSG^®)