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The transmission of speech, data, video, and other information using light in the frequency range below the infrared limit of the visible spectrum....


= Encyclopedia Article; = Research Update
Figure 1.Block diagram of a simplified optical communications link.
From Encyclopedia article 'Optical communications'
Figure 10.Large optical four-fiber Metro ring, with protection, loopback, and path switching. (a) System operating with no faults. (b) System using path switching to operate in the presence of a single fault. (c) System using loopback to operate in the presence of a single fault. (d) System using loopback to operate in the presence of a dual fault.
From Encyclopedia article 'Optical communications'
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