Corning Single Mode fiber SMF-28 Optical Fiber 50,000m / 50km

The Corning SMF-28 Ultra Optical Fiber is a 50 km single-mode fiber engineered for telecom, enterprise, and industrial deployments. Compliant with ITU-T G.652.D and exceeding ITU-T G.657.A1 performance, this fiber delivers full-spectrum utilization across 1260–1625 nm with a low water peak characteristic. The 9.2 µm mode field diameter and zero dispersion wavelength of 1304–1324 nm enable high-fidelity signal transmission across C, L, and extended bands. Attenuation at 1550 nm reaches only 0.18 dB/km, with superior macrobend loss performance even at tight 10 mm radii. Operating from −60°C to +85°C and proof tested to ≥100 kpsi tensile stress, SMF-28 Ultra suits both outdoor and indoor installations with backward compatibility to existing G.652 infrastructure.

– Technical Specifications

Optical Characteristics
• Mode Field Diameter: 9.2 µm ± 0.4 µm at 1310 nm
• Cable Cutoff Wavelength: ≤1260 nm
• Zero Dispersion Wavelength: 1304–1324 nm
• Zero Dispersion Slope: ≤0.092 ps/(nm²•km)
• Numerical Aperture: 0.14 at 1310 nm
• Refractive Index Difference: 0.36%
• Core Diameter: 8.2 µm
• Cladding Diameter: 125 µm
• Coating Diameter: 242 ± 5 µm (standard); 200 ± 5 µm (reduced option)

Attenuation
• 1310 nm: ≤0.32 dB/km
• 1490 nm: ≤0.21 dB/km
• 1550 nm: ≤0.18 dB/km
• 1625 nm: ≤0.20 dB/km
• C-band (1525–1575 nm) flatness: ≤0.02 dB/km relative to 1550 nm

Macrobend Loss
• 10 mm mandrel, 1 turn: ≤0.50 dB at 1550 nm; ≤1.5 dB at 1625 nm
• 15 mm mandrel, 10 turns: ≤0.05 dB at 1550 nm; ≤0.30 dB at 1625 nm
• 30 mm mandrel, 100 turns: ≤0.1 dB at 1625 nm

Environmental & Mechanical
• Operating Temperature: −60°C to +85°C
• Proof Test: ≥100 kpsi (0.7 GPa) minimum
• Maximum Length per Spool: 50.4 km

– Key Features

• Full-spectrum low water peak design eliminates 1383 nm attenuation penalty
• Exceeds G.657.A1 macrobend performance; handles tight radius installations
• Extended L-band operation to 1625 nm for systems
• Backward compatible with legacy SMF-28e+ fiber and G.652 infrastructure

– Typical Applications

• Long-haul and metropolitan telecom links
• Enterprise backbone and campus networks
• Industrial control and monitoring systems
• Future-ready DWDM and broadband deployments

– Compatibility & Integration

Fully backward compatible with installed SMF-28e+ and G.652-compliant fibers. Meets ITU-T G.652.D specification and exceeds G.657.A1 performance thresholds.