Photosensitive Single-Mode Fiber

Photosensitive Single-Mode Fiber
Nufern photosensitive fibers are designed to reduce grating-writing times associated with industry-standard
telecommunication fiber and can be easily spliced. These photosensitive fibers provide cost-savings for grating-writing
because customers can write highly repeatable, quality gratings in a short time.

Optical Specifications GF1 GF1AA GF3 GF1B
Operating Wavelength (nominal) 1500 – 1600 nm 1500 – 1600 nm 1500 – 1600 nm 1550 nm
Mode Field Diameter 9.3 ± 0.5 μm @ 1310 nm NA NA NA
10.5 ± 1.0 μm @ 1550 nm 10.5 ± 0.8 μm @ 1550 nm 7.5 ± 0.5 μm @ 1550 nm 10.4 ± 0.8 μm @ 1550 nm
Second Mode Cut-Off 1260 ± 75 nm 1350 ± 100 nm 1350 ± 50 nm 1260 ± 100 nm
Numerical Aperture (nominal) 0.13 0.13 0.16 0.13
Bend Loss @ 1550 nm < 0.02 dB < 0.02 dB < 0.001 dB < 0.09 dB
(100 turns, 25 mm radius)
Bend Radius for 0.05 dB Less than LTBR Less than LTBR Less than LTBR 26 mm
per 100 Turns @ 1550 nm
Geometrical &
Mechanical Specifications
Clad Diameter 125.0 ± 1.5 μm 125.0 ± 1.5 μm 125.0 ± 1.0 μm 125.0 ± 1.0 μm
Coating Diameter 250 ± 20 μm 250 ± 20 μm 245 ± 15 μm 245 ± 15 μm
Core-Clad Concentricity < 0.5 μm < 1.0 μm < 0.5 μm < 0.5 μm
Coating/Clad Offset < 5 μm < 5 μm < 5 μm < 5 μm
Proof Test Level > 100 kpsi (0.7 GN/m2) >100 kpsi (0.7 GN/m2) >100 kpsi (0.7 GN/m2) >100 kpsi (0.7 GN/m2)
Coating Material UV Cured, Dual Acrylate UV Cured, Dual Acrylate UV Cured, Dual Acrylate UV Cured, Dual Acrylate
Operating Temperature - 55 to +85º C - 55 to +85º C - 55 to +85º C - 55 to +85º C
Short-Term Bend Radius > 12 mm > 12 mm > 12 mm > 12 mm
Long-Term Bend Radius > 25 mm > 25 mm > 25 mm > 25 mm

Typical Applications
• WDM
• Gain flattening filters
• Dispersion compensators
• Pump stabilizers
Features & Benefits
• Enhanced photosensitivity — Shorter grating writing time
• Mode-matched to transmission fibers — Low splice loss
• Tightly controlled specifications — Excellent uniformity