Is the fiber optic cable single-mode or dual-mode

Fiber optic cables are usually either single-mode or multimode, with "dual-mode" not being a standard type.Common Types of Fiber Optic CablesSingle-mode fiber (SMF) has a very narrow core, typically around 8–10 microns, allowing only one mode of light to propagate. This minimizes signal loss and modal dispersion, making it ideal for long-distance, high-bandwidth applications such as telecom backbones and long-haul networks . Single-mode fibers are often used with laser light sources and can transmit data over tens of kilometers without repeaters . Multimode fiber (MMF) has a larger core, usually 50 or 62.5 microns, which allows multiple light modes to travel simultaneously. This makes multimode fiber suitable for short-distance, high-speed connections within buildings, data centers, or campus networks. Multimode fiber is generally less expensive and uses LEDs or VCSELs as light sources .Key DifferencesCore size: Single-mode ~9 µm, Multimode 50–62.5 µmDistance: Single-mode supports tens of kilometers; multimode is limited to hundreds of meters to a few kilometersLight modes: Single-mode carries one light path; multimode carries multiple pathsCost: Single-mode is more expensive due to precision manufacturing and laser requirements; multimode is cheaper and easier to installApplications: Single-mode for long-haul telecom and backbone networks; multimode for LANs, data centers, and short-range high-speed links Clarification on "Dual-Mode"The term dual-mode is not standard in fiber optics. Networks typically use either single-mode or multimode fibers. Some hybrid systems may combine different fiber types, but these are not referred to as dual-mode cables. In summary, fiber optic cables are usually categorized as single-mode or multimode, with the choice depending on distance, bandwidth requirements, and cost considerations .