Corning SMF-28(R) ULL FIBER Optical Bare Fiber 25,000 m / 25km

The Corning SMF-28(R) ULL (Ultra Low Loss) Optical Bare Fiber is a single-mode fiber engineered for long-haul transmission and research applications requiring minimal signal attenuation. This 25,000 m spool delivers exceptional optical performance across the C, L, and S bands, with maximum attenuation of 0.31 dB/km at 1310 nm, 0.17 dB/km at 1550 nm, and 0.20 dB/km at 1625 nm. The fiber achieves typical attenuation of 0.16 dB/km at 1550 nm, enabling extended reach without regeneration.

– Technical Specifications

Optical Performance
• Attenuation: 1310 nm ≤ 0.31 dB/km | 1550 nm ≤ 0.17 dB/km | 1625 nm ≤ 0.20 dB/km
• Dispersion: 1550 nm ≤ 18.0 ps/(nm•km) | 1625 nm ≤ 22.0 ps/(nm•km)
• Zero Dispersion Wavelength: 1304 nm to 1324 nm
• Zero Dispersion Slope: ≤ 0.092 ps/(nm²•km)
• Polarization Mode Dispersion: ≤ 0.04 ps/√km (link design value) | ≤ 0.1 ps/√km (maximum individual fiber)
• Mode-Field Diameter: 9.2 ± 0.5 µm at 1310 nm | 10.7 ± 0.5 µm at 1550 nm
• Core Diameter: 8.2 µm
• Numerical Aperture: 0.14
• Cable Cutoff Wavelength: ≤ 1260 nm
• Rayleigh Backscatter: -77 dB at 1310 nm | -82 dB at 1550 nm (1 ns pulse width)

Macrobend Loss
• 10 mm mandrel, 1 turn: ≤ 0.75 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

Mechanical & Environmental
• Proof Test: ≥ 100 kpsi (0.69 GPa)
• Operating Temperature: -60°C to +85°C
• Temperature Dependence: ≤ 0.05 dB/km across operating range
• Cladding Diameter: 125.0 ± 0.7 µm
• Core-Clad Concentricity: ≤ 0.8 µm
• Coating Strip Force: 0.6 lbs (3 N)
• Fiber Curl Radius: ≥ 4.0 m

– Key Features

• Wavelength-flattened attenuation across 1285–1625 nm enables multi-band operation
• Low PMD design supports high-speed coherent transmission
• Superior macrobend performance permits tight routing in field deployments
• G.652 compatibility ensures integration with existing infrastructure

– Typical Applications

• Long-haul terrestrial and submarine transmission
• Space-division multiplexing (SDM) systems
• Research and development in advanced optical networks
• Ultra-long-span point-to-point links

– Compatibility & Integration

Compliant with ITU-T G.652 standard fiber specifications. Supports legacy and modern optical systems without modification.