The Corning SMF-28(R) ULL (Ultra-Low-Loss) optical bare fiber delivers exceptional performance for transoceanic cables and hyperscale data center interconnects. Ultra-low attenuation at 1550 nm enables extended transmission spans and higher data rates while maintaining ITU-T G.652.B and G.654.C compliance. Selected variants meet ITU-T G.657.A1 for enhanced bend performance. A compact 200 µm coating option supports high-density cable designs.
Technical Specifications
Optical Performance
• Attenuation @ 1550 nm: 0.156–0.17 dB/km
• Attenuation @ 1310 nm: ≤0.272–0.31 dB/km
• Mode Field Diameter @ 1550 nm: 10.5–10.7 ± 0.5 µm
• Mode Field Diameter @ 1310 nm: 8.2 µm
• Chromatic Dispersion @ 1550 nm: ≤18.0 ps/(nm•km)
• Chromatic Dispersion @ 1625 nm: ≤22.0 ps/(nm•km)
• Zero Dispersion Wavelength: 1300–1324 nm
• Zero Dispersion Slope: ≤0.092 ps/(nm²•km)
• PMD Link Design Value: ≤0.04 ps/√km
• Maximum Individual Fiber PMD: ≤0.1 ps/√km
• Cable Cutoff Wavelength: ≤1260–1520 nm
• Numerical Aperture: 0.14 NA @ 1310 nm
Dimensional
• Cladding Diameter: 125.0 ± 0.7 µm
• Core Diameter: 8.2 µm
• Coating Diameter: 242 ± 5 µm (standard) or 200 ± 5 µm (compact)
• Core-Clad Concentricity: ≤0.6 µm (G.652.B) or ≤0.8 µm (G.654.C)
• Cladding Non-Circularity: ≤0.7%
• Minimum Bend Radius: 4.0 m
Environmental & Mechanical
• Macrobend Loss (1550 nm, 10 mm mandrel, 1 turn): ≤0.75 dB
• Macrobend Loss (1550 nm, 15 mm mandrel, 10 turns): ≤0.05 dB
• Proof Test Level: ≥100 kpsi (0.7 GPa)
• Attenuation Stability (-60°C to +85°C): ≤0.05 dB/km
• Temperature-Humidity Cycling (-10°C to +85°C, 98% RH): ≤0.05 dB/km
– Key Features
• Ultra-low loss at C-band enables 1000 km span capability
• Tightly controlled attenuation across 1285–1575 nm windows
• Low PMD for high-speed coherent transmission
• Dual-coating option for flexible deployment
• Precise core-clad concentricity ensures consistent performance
– Typical Applications
• Transoceanic and long-haul terrestrial cables
• Hyperscale data center interconnects
• Ultra-long-distance coherent systems
• C-band and L-band transmission networks
– Compatibility & Integration
Compliant with ITU-T G.652.B, G.654.C, and G.657.A1 (select variants) standards for interoperability with installed infrastructure and advanced optical systems.
