The Corning SMF-28 Optical Bare Fiber is a single-mode optical fiber engineered for high-bandwidth, long-distance data transmission with minimal signal loss. This 25 km spool delivers performance compliant with ITU-T G.652.D and exceeding ITU-T G.657.A1 requirements, with proven backward compatibility across legacy single-mode fiber installations.
Technical Specifications
Fiber Geometry
• Core diameter: 8.2 µm
• Cladding diameter: 125 ± 1 µm
• Coating diameter: 242 ± 5 µm, 245 ± 5 µm, or 200 µm (compact option)
• Mode field diameter @ 1310 nm: 9.2 µm
• Mode field diameter @ 1550 nm: 10.4–10.5 µm
• Numerical aperture (NA): 0.14
Optical Performance
• Operating wavelengths: 1310 nm / 1550 nm
• Maximum attenuation: ≤ 0.32 dB/km @ 1310 nm; ≤ 0.18 dB/km @ 1550 nm
• Zero dispersion wavelength (λ₀): 1304–1324 nm
• Dispersion @ 1550 nm: ≤ 18.0 ps/(nm•km)
• Dispersion @ 1625 nm: ≤ 22.0 ps/(nm•km)
• Zero dispersion slope (S₀): ≤ 0.092 ps/(nm²•km)
• Cutoff wavelength (λcc): ≤ 1260 nm
Signal Integrity
• PMD link design value: ≤ 0.04 ps/√km
• Maximum individual fiber PMD: ≤ 0.1 ps/√km
• Macrobend loss (10 mm mandrel, 1 turn @ 1550 nm): ≤ 0.50 dB
• Macrobend loss (15 mm mandrel, 10 turns @ 1550 nm): ≤ 0.05 dB
– Key Features
• 25 km length on single spool eliminates mid-span splicing for extended runs
• Flat spectral response across C-band (1530–1565 nm) and L-band (1565–1625 nm)
• Low macrobend loss enables deployment in compact bend-radius environments
• Attenuation uniformity: ≤ 0.03 dB/km variation (1285–1330 nm)
– Typical Applications
• Metro and long-haul DWDM transport systems
• High-speed backbone interconnect (100 Gbps and beyond)
• Point-to-point terrestrial links requiring extended reach
• Submarine cable manufacture and repair operations
– Compatibility & Integration
Fully compatible with standard single-mode fiber termination, splicing, and test equipment. Supports dual-window operation (1310/1550 nm) on systems requiring simultaneous C- and L-band transmission.
