The center of the fiber is usually a core made of glass, and the core is surrounded by a glass envelope with a lower refractive index than the core, so that the optical the core is reflected by the cladding interface, so that the optical s in the core. Since the optical fiber itself is very fragile and cannot be directly applied to the wiring system, it is usually bundled, with a protective casing on the outside and a tensile ddle. This is the so-called optical cable, which usually contains one or more optical fibers.
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