There are two main types of optic cables: single mode and multimode fibers. The difference between the two is in the size of the core. Multi-mode fibers have wider cores thus allow multiple modes of light to propagate.
Single mode fibers, on the other hand, have narrow cores that allow only a single mode of light to propagate. The multi-mode fibers are designed for use with cheaper light sources such as less precisely aimed lasers.
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