The Corning SMF-28 Optical Bare Fiber is a single-mode optical fiber engineered for telecommunications, data center, and specialized sensing applications. Supplied as a 15 km spool, this fiber meets ITU-T G.652.D and G.657.A1 standards, delivering low-loss performance across C and L bands. Precise geometrical tolerances enable efficient splicing for custom cable assemblies and high-power laser delivery systems.
Technical Specifications
Optical Properties
• Core diameter: 8.2 µm
• Cladding diameter: 125.0 ± 0.7 µm
• Coating diameter: 245 ± 5 µm
• Mode-field diameter (MFD): 9.2 µm nominal at 1310 nm; 10.7 ± 0.5 µm at 1550 nm
• Numerical aperture (NA): 0.14 at 1310 nm
Attenuation
• 1310 nm: ≤0.272 dB/km (max), ≤0.32 dB/km (typical)
• 1550 nm: ≤0.158 dB/km (max), ≤0.18 dB/km (typical)
• 1383 nm: ≤2.1 dB/km
• Wavelength-dependent attenuation difference (1285–1330 nm ref. 1310 nm): ≤0.03 dB/km
• Wavelength-dependent attenuation difference (1525–1575 nm ref. 1550 nm): ≤0.02 dB/km
Dispersion
• 1550 nm: ≤18.0 ps/(nm•km)
• 1625 nm: ≤22.0 ps/(nm•km)
• Zero dispersion wavelength (λ₀): 1304–1324 nm
• Zero dispersion slope (S₀): ≤0.092 ps/(nm²•km)
Polarization Mode Dispersion (PMD)
• Link design value: ≤0.04 ps/√km
• Maximum individual fiber: ≤0.1 ps/√km
Additional Optical Parameters
• Rayleigh backscatter: -77 dB at 1310 nm; -82 dB at 1550 nm
• Cable cutoff wavelength: ≤1260 nm
• Point discontinuity: ≤0.10 dB at 1310 nm or 1550 nm
• Macrobend loss (1550 nm, 100 mm mandrel, 100 turns): ≤0.1 dB
Mechanical
• Proof test: ≥100 kpsi (≥0.69 GPa) tensile stress, full fiber length
• Fiber curl: ≥4.0 m minimum radius of curvature
Environmental
• Operating temperature: -60°C to +85°C
– Key Features
• ITU-T G.652.D and G.657.A1 compliant
• Low-loss splicing geometry for interconnect applications
• Wideband performance from 1310 nm to 1625 nm
• Proven suitability for long-haul transmission and sensing networks
– Typical Applications
• Telecommunications backbone networks
• Data center interconnect
• Distributed fiber sensing systems
• Custom cable assembly manufacturing
• High-power laser beam delivery
– Compatibility & Integration
SMF-28 bare fiber integrates directly into standard single-mode termination schemes and fusion splicing workflows. Geometrical specifications ensure compatibility with industry-standard connectors and passive components designed for G.652 fiber.
