Optical Fiber Technology

Optical Fibers photographic   The optical fiber concept has been around for more than a century. From the early experiments by John Tyndall in the guided transmission light, through the development of light-emitting diodes and lasers, and the emergence of dense wavelength-division multiplexing, the applications for optical fiber have continued to grow. Today, optical fiber technologies permeate a variety of industries. For instance, delivering high-definition broadcast (HDTV) at resolutions of 1080p has become possible through the deployment of fiber-to-the-curb (FTTc or FTTh) networks. Satellites transporting L-Band signals over fiber do not need to be demodulated, and also suffer less attenuation.
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Fiber Optics Glossary

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In a strict sense, the region of the electromagnetic spectrum that can be perceived by human vision, designated the visible spectrum, and nominally covering the wavelength range of 0.4 um to 0.7 um. In the laser and optical communication fields, custom and practice have extended usage of the term to include the much broader portion of the electromagnetic spectrum that can be handled by the basic optical techniques used for the visible spectrum. This region has not been clearly defined, but, as employed by most workers in the field, may be considered to extend from the near-ultraviolet region of approximately 0.3 um, through the visible region, and into the mid-infrared region to 30 um.