Part #:
980C-HP

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980/1550 nm Coupler Fiber

Nufern 980C-HP fiber is a high-performance, mid-NA fiber optimized for use by coupler manufacturers in the telecom industry. It features low, consistent splice and bend loss, and a design to minimize excess loss in the coupler. The fiber is produced with extremely tight second mode cut-off tolerance, and the high tensile strength critical for long-term reliability in tight bend radius applications. These high-performance specifications also result in improved production yields and reduced component manufacturer costs.

Applications
WDM pump/signal couplers for EDFAs CATV couplers; Tap couplers Bi-directional splitters and combiners Ultra-compact components requiring small bend radii

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
Operating Wavelength	980–1600 nm
Mode Field Diameter	4.9 ± 0.3 µm @ 980 nm 7.7 ± 0.3 µm @ 1550 nm
Second Mode Cut-Off	930 ± 30 nm
Attenuation	≤ 3 dB/km @ 980 nm
Core Numerical Aperture (nominal)	0.16
Bend Loss for 100 turns @ LTBR	0.001 dB @ 980 nm
Bend Radius for 0.05 dB per 100 Turns	Much less than LTBR @ 980 nm (nominal)
Geometrical & Mechanical Specifications
Clad Diameter	125.0 ± 1.0 µm
Coating Diameter	245 ± 15 µm
Core-Clad Concentricity	< 0.3 µm
Coating/Clad Offset	≤ 5 µm
Fiber Non-Circularity	≤ 2.0%
Coating Material	UV Cured, Dual Acrylate
Operating Temperature	-55 to +85 °C
Short-Term Bend Radius	≥ 6 mm
Long-Term Bend Radius	≥ 13 mm
Proof Test Level	≥ 200 kpsi (1.4 GN/m²)

Fiber cross section

Part #:980C-HP