The Corning SMF-28 Optical Bare Fiber is a single-mode optical fiber supplied on a 3000-meter spool, engineered for telecommunications applications requiring low attenuation and controlled dispersion. Manufactured via Outside Vapor Deposition (OVD) process, the fiber meets ITU-T Recommendation G.652 standards and features a dual acrylate CPC coating with 245 µm outside diameter.
Technical Specifications
Optical Characteristics:
• Core diameter: 8.2 µm
• Cladding diameter: 125.0 ± 0.7 µm
• Mode Field Diameter: 9.2 ± 0.5 µm @ 1310 nm; 10.7 ± 0.5 µm @ 1550 nm
• Numerical Aperture: 0.14
• Maximum attenuation: ≤ 0.35 dB/km @ 1310 nm; ≤ 0.25 dB/km @ 1550 nm
• Attenuation at water peak: ≤ 2.1 dB/km @ 1383 ± 3 nm
• Zero dispersion wavelength: 1300 nm ≤ λ₀ ≤ 1324 nm
• Zero dispersion slope: ≤ 0.092 ps/(nm²•km)
• Dispersion @ 1550 nm: ≤ 18.0 ps/(nm•km)
• Polarization mode dispersion: ≤ 0.1 ps/√km (maximum individual fiber)
• Cable cutoff wavelength: ≤ 1260 nm
• Point discontinuity: No discontinuity > 0.10 dB @ 1310 nm or 1550 nm
Mechanical & Environmental:
• Proof test: ≥ 100 kpsi (0.7 GPa)
• Operating temperature: -60°C to +85°C
• Coating diameter: 245 ± 5 µm
• Core-clad concentricity: ≤ 0.8 µm
• Cladding non-circularity: ≤ 0.7%
• Fiber curl: ≥ 4.0 m radius of curvature
• Temperature dependence: ≤ 0.05 dB/km across full operating range
• Temperature-humidity cycling: ≤ 0.05 dB/km (-10°C to +85°C, 98% RH)
– Key Features
• Step-index profile with high-purity glass geometry
• Enhanced dual acrylate coating for cable integration
• Low macrobend loss characteristics
• Compliance with ITU-T G.652.B and G.652.D standards
• Stable performance across extended temperature range
– Typical Applications
• Long-distance telecommunications links
• Metropolitan area networks (MAN)
• Single-mode fiber optic cable assemblies
• Applications utilizing 1310 nm and 1550 nm windows
– Compatibility & Integration
The 245 µm coating diameter and tight geometric tolerances enable integration into standard single-mode cable designs. Core-clad concentricity of ≤ 0.8 µm ensures low-loss splice performance.
