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# Download Cabling. Part 2, Fiber-optic cabling and components by Bill Woodward PDF

By Bill Woodward

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The next step forward in the optical use of fibers occurred in 1926. In that year, Clarence Weston Hansell, an electrical engineer doing research related to the development of television at RCA, filed a patent for a device that would use parallel quartz fibers to transmit a lighted image over a short distance. The device remained in the conceptual stage, however, until a German medical student, Heinrich Lamm, developed the idea independently in an attempt to form a flexible gastroscope. In 1930, Lamm bundled commercially produced fibers and managed to transmit a rough image through a short stretch of the first fiber-optic cable.

A gain of 3 decibels means that you have about twice the original power. 953 percent of the original power. Because decibels can be algebraically added and subtracted, you can use combinations of the decibel values to determine total gains or losses. For example, the rules of thumb can be applied to find the power output from an amplifier with an input of 10μW and a gain of 17dB. First, apply the 10dB rule and multiply 10μW by 10. Then apply the 7dB rule and multiple the result of the first calculation by 5.

Sidebars are entire paragraphs of information that, although related to the topic being discussed, fit better into a standalone discussion. They are just what their name suggests: a sidebar discussion. Cabling @ Work Sidebars These special sidebars are used to give real-life examples of situations that actually occurred in the cabling world. Enjoy! Have fun reading this book—it has been fun writing it. I hope that it will be a valuable resource to you and will answer at least some of your questions on fiber optics.