Optical Cable Type and Diameter Table

Fiber optic cables come in multiple models including single-mode and multi-mode types, with core diameters ranging from 8 µm to 62.5 µm and overall cable dimensions from approximately 3x2 mm to larger multi-fiber assemblies.Fiber Optic Cable TypesSingle-Mode Fiber (SMF)Designed for long-distance communication with low signal loss.Core diameter: ~8–10 µm.Common standards: G.652.D, G.655, G.657.A1, G.657.A2.Typically used in telecom backbones and high-speed internet networks . Multi-Mode Fiber (MMF)Suitable for shorter distances such as LANs and data centers.Core diameters:OM1: 62.5 µmOM2: 50 µmOM3/OM4/OM5: 50 µm with enhanced bandwidth and support for higher data rates .OM5 supports short wavelength division multiplexing for up to 400 Gbps .Cable Construction and DimensionsCore and CladdingCore: central light-carrying element.Cladding: surrounds the core to reflect light back into it.Buffer coating: protective layer around cladding to prevent damage . Sheath MaterialsLSZH (Low Smoke Zero Halogen) for indoor safety.PVC or PE for indoor/outdoor use.FRP (Fiber Reinforced Plastic) elements for tensile strength . Typical Cable DimensionsIndoor drop cables: ~3x2 mm, accommodating 1–8 fibers.Multi-fiber outdoor cables: diameters vary depending on fiber count and reinforcement layers, often 6–12 mm or larger.Bending radius and tensile strength are designed according to installation requirements .Examples of Optical Cable ModelsModelFiber TypeFiber CountCore DiameterJacketApprox. DimensionsOM1Multi-mode1–1262.5 µmLSZH/PVC3x2 mm (1–8 fibers)OM2Multi-mode1–1250 µmLSZH/PVC3x2 mmOM3Multi-mode1–2450 µmLSZH/PE4–6 mmOM4Multi-mode1–2450 µmLSZH/PE4–6 mmOM5Multi-mode1–2450 µmLSZH/PE4–6 mmG.652.DSingle-mode1–129 µmLSZH/PE3–6 mmG.657.A2Single-mode1–129 µmLSZH/PE3–6 mmAdditional NotesFiber optic cables are available in indoor, outdoor, and hybrid variants.Outdoor cables may include waterproofing, UV resistance, and armored layers for harsh environments .Tensile strength, bending radius, and maximum fiber count vary by manufacturer and application requirements .Connector compatibility (LC, SC, ST, MPO) is an important consideration when selecting a cable model . This overview provides a comprehensive reference for optical cable models, core sizes, and approximate dimensions suitable for network design, installation, and procurement purposes.