Thin fused silica, glass, or plastic rods {optical fiber}| can transmit light. Outside layer {cladding} reflects rays. Absorbing high-angle rays and reflecting low-angle rays makes one axial light ray. Refocusing light by refractive-index gradient makes one axial light ray. Wavelengths amplify in region with rare-earth erbium ions added, which laser excites. Over 150 wavelengths can be in fibers using multiplexing {dense wavelength division multiplexing} (DWDM), which allows 400 gigabits per second.
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Date Modified: 2022.0224