Fiber optics technology was developed by physicists and, following the convention of
optics, wavelength rather than frequency is used to denote the position of light emission
in the electromagnetic spectrum. The fiber optics of today uses three wavelength bands:
(1) around 800 nm (nanometers), (2) 1300 nm, and (3) 1600 nm or near-visible infrared.
This is illustrated in Figure 9.22.