Single-mode multi-core optical cable

Single-mode multi-core optical cables feature 8–10 µm cores, support long-distance high-speed transmission, and are available in OS1 and OS2 types for indoor and outdoor applications.Core and Light PropagationSingle-mode fibers have a small core diameter of approximately 8–10 microns, allowing only a single mode of light to propagate. This minimizes modal dispersion and enables long-distance, high-bandwidth transmission over tens to hundreds of kilometers without significant signal degradation . Multi-core cables contain multiple single-mode fibers bundled together, allowing parallel transmission channels within a single cable sheath.Attenuation and BandwidthOS1 cables: Indoor, tight-buffered construction, maximum attenuation of 0.4 dB/km at 1310 nm and 0.3 dB/km at 1550 nm, with a bandwidth of 200 MHz·km at 1310 nm . Suitable for distances up to ~10 km.OS2 cables: Outdoor, loose-tube or semi-rigid construction, designed for longer distances, supporting speeds up to 100 Gbps over distances up to 200 km .Wavelength and Light SourceSingle-mode fibers typically operate at 1310 nm and 1550 nm wavelengths, using distributed feedback (DFB) or external modulation lasers for low attenuation and high signal integrity . The narrow core ensures a focused light path, reducing the need for repeaters over long distances.Cable ConstructionIndoor (OS1): Tight-buffered, flexible, crush-resistant, with dual-layer protective coating (plastic and waterproof acrylate). Easier installation and connector termination without gel or fan-out kits .Outdoor (OS2): Loose-tube or spiral core design, semi-rigid tubing, often gel-filled or dry-block for moisture protection. Suitable for direct burial, aerial, or duct installations .Multi-Core ConsiderationsMulti-core single-mode cables can contain 2, 4, 8, 12, or more fibers within a single jacket. Each fiber is color-coded for identification and may float within a protective tube filled with gel or dry-block material to prevent mechanical stress. Multi-core designs are ideal for backbone networks, data centers, and high-capacity long-haul links.ApplicationsTelecommunication backbonesLong-haul high-speed networksData centers and enterprise networksCampus and metropolitan area networks Single-mode multi-core cables are preferred when signal integrity, long-distance reach, and high bandwidth are critical, outperforming multimode fibers in these scenarios .