There are two main types of fiber optic cables: single mode fiber and multimode fiber. Optical fibers are among the most transformative technologies in modern photonics, quietly enabling the global internet, precision sensing, minimally invasive medicine, and high-power industrial laser systems. At their core, all optical fibers perform the same fundamental task – guiding light. In fiber-optic communication, a single-mode optical fiber, also known as fundamental- or mono-mode, is an optical fiber designed to carry only a single mode of light - the transverse mode. The basic structure consists of a central transparent core where the light travels and an outer layer called the cladding.
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