A single-mode 4-core fiber optic cable typically features OS2 fibers with 8–10 µm core diameter, 125 µm cladding, low attenuation, and G.652.D compliance, designed for long-distance, high-speed optical transmission.

Fiber-Level Specifications

• Core Diameter: 8–10 µm, optimized for single-mode operation to minimize modal dispersion .
• Cladding Diameter: 125 µm, standard for single-mode fibers .
• Mode Field Diameter (MFD): Approximately 9.2 µm at 1310 nm and 10.4 µm at 1550 nm .
• Cut-off Wavelength: Below 1260 nm to ensure single-mode operation across the O-band (1310 nm) and C-band (1550 nm), .
• Attenuation Coefficient: Typically ≤0.35 dB/km at 1310 nm and ≤0.22 dB/km at 1550 nm for OS2 fibers .
• Chromatic Dispersion: Low dispersion in the 1310 nm window (~3.5 ps/nm·km) and controlled dispersion in the 1550 nm window (~17 ps/nm·km), supporting long-haul and metro applications .
• Polarization Mode Dispersion (PMD): ≤0.1 ps/√km typical, ensuring minimal pulse broadening .
• Bend Insensitivity: Some variants (e.g., G.657.A2) support tight bend radii for FTTH installations .
• Material: Pure silica core with fluorine-doped cladding or proprietary coatings for durability and low nonlinearity .

Cable-Level Construction

• Number of Fibers: 4 cores, suitable for FTTH, GPON, or small-scale backbone deployments .
• Loose Tube: PBT loose tube filled with jelly compound to protect fibers from moisture and mechanical stress .
• Strength Members: Multi-strand aramid yarn for tensile strength and impact resistance .
• Outer Jacket: PE (polyethylene) or LSZH (low-smoke zero-halogen) for environmental protection .
• Diameter: Typically 6–8 mm for round drop cables, depending on manufacturer .
• Temperature Range: Operating: -40°C to +70°C; Storage: -40°C to +85°C .

Standards Compliance

• ITU-T G.652.D: Ensures compatibility with DWDM systems and future-proof network upgrades .
• IEC 60793-2-50: Optical fiber type B.1.1 for single-mode fibers .
• Telcordia GR-20-CORE, ANSI/ICEA S-87-640: For mechanical and environmental reliability .

Testing and Quality Assurance

• OTDR Testing: Each cable is tested for splice loss, length, and fault detection .
• Wavelength Testing: Performance verified at 1310, 1550, and 1625 nm .
• Mechanical Tests: Tensile, crush, and bend tests to ensure durability under installation conditions .

Applications

• FTTH/GPON Networks: Connecting end-users to optical networks .
• Metro and Long-Haul Telecom: Backbone and interconnect links up to 100 km without regeneration .
• Data Centers: High-speed interconnects supporting 400G/800G coherent optics .
• CATV and Utility Networks: Reliable signal transmission in harsh environments . This combination of fiber and cable specifications ensures that a 4-core single-mode fiber optic cable provides high-speed, low-loss, and durable performance suitable for modern telecommunications and data networks.