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Black Box Explains... Single-Mode Fiber Optic Cable.

Multimode fiber cable has multiple modes of propagation—that is, several wavelengths of light are normally used in the fiber core. In contrast, single-mode fiber cable has only one mode of propagation: a single wavelength of light in the fiber core. This means there’s no interference or overlap between the different wavelengths of light to garble your data over long distances like there is with multimode cable.

What does this get you? Distance–up to 50 times more distance than multimode fiber cable. You can also get higher bandwidth. You can use a pair of single-mode fiber strands full-duplex for up to twice the throughput of multimode fiber cable. The actual speed and distance you get will vary with the devices used with the single-mode fiber.
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