Nufern 980 nm Select Cut-Off
Single-Mode Fibers
Nufern’s 980 nm high-performance select cut-off single-mode fibers are optimized for use by component manufacturers
in the telecommunications wavelengths. These application-specific fibers were developed for pump diode pigtails, unique
delivery for components, and couplers. Available in 80 µm and 125 µm form factors, Nufern’s 980 nm fibers offer exceptional
uniformity and core/clad concentricity specifications, very tight second mode cut-off tolerances, and tighter bend radius
applications in miniaturized fiber optic packages. These high-performance specifications result in superior strength,
increased component reliability, improved production yields and reduced component manufacturer costs.
Typical Applications
• Pump Diode Pigtails
• Metro components
• Small form factor components
• Couplers
Features & Benefits
• Exceptional uniformity and core/clad concentricity — Low, consistent splice loss to telecom components
• Extremely tight second mode cutoff tolerance — High yield coupler manufacturing
• Higher proof test levels — Critical for long-term reliability in tight bend applications
Optical Specifications
980-HP
980-HP-80
980M-HP-80
Operating Wavelength
980 – 1600 nm
980 – 1600 nm
980 – 1600 nm
Core NA
0.200
0.200
0.170
Mode Field Diameter
4.2 ± 0.5 µm @ 980 nm
6.8 ± 0.5 µm @ 1550 nm
4.2 ± 0.5 µm @ 980 nm
6.8 ± 0.5 µm @ 1550 nm
4.7 ± 0.3 µm @ 980 nm
Cutoff
920 ± 30 nm
920 ± 30 nm
930 ± 30 nm
Core Attenuation
≤ 3.5 dB/km @ 980 nm
≤ 3.5 dB/km @ 980 nm
≤ 3.0 dB/km @ 980 nm
Geometrical & Mechanical
Specifications
Cladding Diameter
125.0 ± 1.0 µm
80.0 ± 1.0 µm
80.0 ± 1.0 µm
Core Diameter
3.6 µm
3.6 µm
4.5 µm
Coating Diameter
245.0 ± 15.0 µm
165.0 ± 10.0 µm
165.0 ± 10.0 µm
Coating Concentricity
< 5.0 µm
< 5.0 µm
< 5.0 µm
Core/Clad Offset
≤ 0.50 µm
≤ 0.50 µm
≤ 0.50 µm
Coating Material
UV Cured, Dual Acrylate
UV Cured, Dual Acrylate
UV Cured, Dual Acrylate
Operating Temperature Range
-55 to 85 °C
-55 to 85 °C
-55 to 85 °C
Short Term Bend Radius
≥ 6 mm
≥ 4 mm
≥ 4 mm
Long Term Bend Radius
≥ 13 mm
≥ 9 mm
≥ 9 mm
Prooftest Level
≥ 200 kpsi (1.4 GN/m²)
≥ 200 kpsi (1.4 GN/m²)
≥ 200 kpsi (1.4 GN/m²)
