Corning SMF-28(R) ULL Single Mode Optical Bare Fiber 2150 M / 2km

Corning SMF-28(R) ULL Single Mode Optical Bare Fiber is an ultra-low loss fiber engineered for long-distance telecommunications infrastructure and extended-reach applications. This 2150 m / 2 km bare fiber delivers minimal signal degradation across C-band and L-band wavelengths, meeting ITU-T G.652.B and G.654.C compliance standards. With maximum attenuation of 0.17 dB/km at 1550 nm and superior chromatic dispersion characteristics, it provides the optical performance required for demanding backbone and subsea deployments.

– Technical Specifications

Optical Performance
• Core diameter: 8.2 µm
• Cladding diameter: 125.0 ± 0.7 µm
• Numerical aperture: 0.14 (at 1310 nm)
• Cable cutoff wavelength: ≤ 1260 nm
• Attenuation at 1310 nm: ≤ 0.31 dB/km
• Attenuation at 1550 nm: 0.16 dB/km (typical), 0.17 dB/km (maximum)
• Attenuation at 1625 nm: ≤ 0.20 dB/km
• Attenuation at 1383 ± 3 nm: ≤ 2.1 dB/km

Dispersion and PMD
• Chromatic dispersion at 1550 nm: ≤ 18.0 ps/(nm•km)
• Chromatic dispersion at 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 link design value: ≤ 0.04 ps/√km
• Maximum individual fiber PMD: ≤ 0.1 ps/√km

Mechanical Properties
• Macrobend loss at 1550 nm (1 turn, 10 mm radius): ≤ 0.1 dB
• Macrobend loss at 1550 nm (10 turns, 15 mm radius): ≤ 0.05 dB
• Point discontinuity: ≤ 0.05 dB at 1310 nm and 1550 nm
• Core-cladding concentricity: ≤ 0.6 µm to ≤ 0.8 µm (dependent on ITU compliance variant)
• Cladding non-circularity: ≤ 0.7%
• Tensile proof stress: ≥ 100

– Key Features

• Ultra-low loss design minimizes signal attenuation over extended distances
• ITU-T G.652.B and G.654.C compliance for infrastructure interoperability
• Low PMD characteristics support high-speed coherent transmission
• Excellent macrobend performance enables practical installation flexibility
• Uniform spectral response across C-band (1525–1575 nm) and L-band (1550–1625 nm)

– Typical Applications

• Long-haul terrestrial backbone routes
• Submarine cable systems
• Metro core rings requiring extended reach
• High-capacity coherent optical systems

– Compatibility & Integration

Conforms to ITU-T Recommendation G.652.B and G.654.C standards, ensuring compatibility with existing telecommunications infrastructure and new-generation transmission equipment.