Difference between multimode fiber and single mode fiber?

I. The difference between multi-mode fiber and single-mode fiber?1. Multi-mode fiber When the geometry of the optical fiber is much larger than the wavelength of the light wave, there will be dozens or even hundreds of propagation modes in the optical fiber. Different propagation modes have different propagation speeds and phases, resulting in long-distance transmission after the time delay, optical pulse broadening. This phenomenon is called mode dispersion of optical fiber. Mode dispersion narrows the bandwidth of a multimode fiber, reducing its transmission capacity, so multimode fibers are only suitable for smaller capacity fiber optic communications. Multimode transceivers receive multiple transmission modes, and the transmission distance is relatively close.2. Single-mode fiber When the geometry of the fiber can be similar to the wavelength of light, the fiber allows only one mode to propagate in it, and the rest of the higher modes are all cut off, and such a fiber is called a single-mode fiber. Because it has only one mode propagation, to avoid the problem of mode dispersion, so the single mode fiber has an extremely wide bandwidth, especially suitable for large-capacity fiber optic communications. Single-mode transceivers receive only a single mode. The transmission distance is relatively long.

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