The fiber core of OS2 optical fiber is a single-mode core with a diameter of approximately 8 to 9 microns, optimized for long-distance, high-bandwidth transmission.

Core Characteristics

OS2 is a single-mode fiber (SMF), meaning it is designed to carry only one light mode through its core, which minimizes modal dispersion and allows for long-distance transmission with low signal loss . The core diameter is typically 8–9 microns, significantly smaller than multimode fibers, which have cores of 50–62.5 microns . This small core ensures that light travels in a straight path, providing high bandwidth and low attenuation, making OS2 ideal for outdoor, long-range, and backbone network applications .

Material and Structure

The OS2 fiber core is made of high-purity silica glass, which supports low-loss transmission at wavelengths of 1310 nm and 1550 nm, and in some cases up to 1625 nm for full-spectrum CWDM and DWDM applications . The fiber is typically encased in a dual-layer protective coating (plastic and waterproof acrylate) and may be installed in loose tube or blown fiber constructions for outdoor use, which protects the core from mechanical stress and environmental factors .

Performance Advantages

• Long-distance capability: OS2 can support distances up to 200 km at high data rates (e.g., 100 Gbps) due to its low attenuation (~0.4 dB/km), .
• High bandwidth: The single-mode core allows for minimal signal distortion over long distances.
• Outdoor suitability: The core and cladding design, combined with protective coatings, make OS2 suitable for campus, metro, and telecom backbone networks . In summary, the OS2 fiber core is a small, single-mode silica core (8–9 microns) designed for efficient, long-distance optical transmission, distinguishing it from OS1 (indoor, shorter-range) and multimode fibers (larger cores for short-distance, multi-mode propagation).