What is the difference between 50/125 and 62.5/125 MMF?

February 5, 2020

The physical differences between these fibers are fairly small with respect to construction. The core area of the fiber, either 50 microns or 62.5 microns, is where the difference lies. Because of the nature of how laser light or light-emitting-diode (LED) light travels down these fibers, the smaller the core usually means a greater ability of the fiber to care information over a given distance. Or the reverse being, the smaller the core the greater the distance a given amount of information (data rate) can be transported. This is the most critical aspect of how optical fibers are specified and where the most activity is spent developing newer and better multimode fibers.



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