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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)