Today, Fiber Closure manufacturers share what is fiber and other features:

An optical fiber is a thin, flexible medium that transmits a beam of light. Most optical fibers must be covered by several layers of protective structures before use. The covered cables are called optical cables. Therefore, the optical fiber is the core part of the optical cable, and the optical fiber is formed by the protection of some components and the auxiliary protective layer.

The protective structure of the outer layer of the fiber prevents damage to the fiber from the surrounding environment. The fiber optic cable includes an optical fiber, a buffer layer, and a cladding. Fiber and coaxial cables are similar except that there is no mesh shield. The center is the light-transmitting glass core.

The fiber is usually bundled and protected by an outer casing. The core is usually a double-layer concentric cylinder made of quartz glass with a small cross-sectional area, which is brittle and easily broken, so that a protective layer is required. So the difference between them is here.

information about Fiber Closure : https://www.greentelftth.com/product/fiber-optical-splice-closure/dome-fiber-optical-splice-closure/