Nufern Ultra-High NA fibers are excellent bridge fibers between high NA waveguides and low NA transmission fiber. Ultra
High NA fibers provide excellent coupling efficiencies to high NA waveguides. In addition, the composition of Ultra-High NA
fibers are tailored to thermally expand the core during splicing thus achieving lower splice loss to transmission fiber.
Typical Applications
• Fluoride and other non-silica fibers
• Planar Waveguides
• Fiber tails for high NA sources
Features & Benefits
• High numerical aperture — Bend insensitive fiber for miniature packages
• Thermally expandable core — Low splice loss to transmission fiber
• Small Mode Field Diameter — High coupling efficiency with Planar Waveguides
Optical Specifications
UHNA1
UHNA3
UHNA4
UHNA7
Operating Wavelength
1100 – 1600 nm
960 – 1600 nm
1100 – 1600 nm
1500 – 2000 nm
Core NA
0.280
0.350
0.350
0.410
Mode Field Diameter
4.0 ± 0.3 µm @ 1310 nm
4.8 ± 0.3 µm @ 1550 nm
3.3 ± 0.3 µm @ 1100 nm
3.3 ± 0.3 µm @ 1310 nm
4.1 ± 0.3 µm @ 1550 nm
2.6 ± 0.3 µm @ 1100 nm
3.3 ± 0.3 µm @ 1310 nm
4.0 ± 0.3 µm @ 1550 nm
2.6 ± 0.3 µm @ 1100 nm
3.2 ± 0.3 µm @ 1550 nm
Cutoff
1000 ± 50 nm
900 ± 50 nm
1050 ± 50 nm
1450 ± 50 nm
Geometrical & Mechanical
Specifications
Cladding Diameter
125.0 ± 1.0 µm
125.0 ± 1.0 µm
125.0 ± 1.0 µm
125.0 ± 1.0 µm
Core Diameter
2.5 µm
1.8 µm
2.2 µm
2.4 µm
Coating Diameter
250.0 ± 20.0 µm
250.0 ± 20.0 µm
250.0 ± 20.0 µm
250.0 ± 20.0 µm
Coating Concentricity
< 5.0 µm
< 5.0 µm
< 5.0 µm
< 5.0 µm
Core/Clad Offset
≤ 0.50 µm
≤ 0.50 µm
≤ 0.50 µm
≤ 0.50 µm
Coating Material
UV Cured, Dual Acrylate
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
-55 to 85 °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
Prooftest 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)
