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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)