The evolution of multimode optical fiber began when Dr. Charles Kao identified the potential for long-distance transmission over glass fiber. In a 1966 paper, he identified the cause of high rate of power loss (attenuation rate) in glass fibers, a significant factor limiting use of fibers for communication. He determined this high rate to be due to impurities in the glass which, if removed, would enable transmission to long distances. This paper marked the start of fiber-optic communications and earned Dr. Kao a Nobel Prize.

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