There are many wires inside the optical cable

Fiber-optic cables do not contain traditional wires; they contain optical fibers, and a single cable can have anywhere from a few fibers to several hundred, depending on its design and application.

Understanding Optical Fibers

Unlike electrical cables, fiber-optic cables use thin strands of glass or plastic called optical fibers to transmit data as pulses of light, not electricity. Each fiber is individually coated with protective layers and bundled into tubes or ribbons, which are then encased in additional protective sheathing for durability and environmental protection. These fibers are sometimes referred to as "cores," and the number of cores determines the cable's capacity.

Typical Fiber Counts

Internal cables (used inside buildings) usually contain up to 144 fibers, often organized in protective tubes. External cables (used outdoors for long-distance communication) can contain up to 276 fibers, with multiple protective tubes and fillers to maintain structure. The number of fibers is influenced by the number of equipment interfaces, redundancy requirements, and whether the system uses single-mode or multimode fibers.

Design ConsiderationsSingle-mode fibers are typically used for long-distance transmission and carry one channel per fiber. Multimode fibers are used for shorter distances and can carry multiple channels per fiber. Cables may include dummy fillers or extra fibers for structural support and future expansion.

Odd numbers of fibers are uncommon; cables are usually designed with even numbers of cores to simplify connections and reduce signal loss. In summary, an optical cable does not contain traditional wires but optical fibers, and the number of fibers can range from a few to several hundred depending on whether the cable is for internal or external use, the type of fiber, and the network requirements.