Visual, and hence optical, communication is older than language. Hand signals, waving of the arms, and fire and smoke signals are basic means of communication, and except under detrimental environmental conditions like pitch-black darkness or fog, they are useful over longer distances than shouting; besides, they are not thwarted by noises like surf at the seashore.
CITATION STYLE
Mitschke, F. (2016). A Quick Survey. In Fiber Optics (pp. 3–13). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-662-52764-1_1
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