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LECTURE #5 FIBER-OPTICS IN TECHNOLOGY INTRODUCTION 1. In fiber-optics, electronic data signals are converted to light pulses and sent through a hair-thin glass or plastic fiber to a detector at the far end, where they are reconverted back to electronic signals. 2. Fiber optic systems use wavelengths between 600 and 1500 nano-meters. (1 nm = 1 × 10 -9 m), often referred to as 0.6 to 1.5 micro-meters (μm) or microns (1 μm or micron = 1 × 10 -6 m). 3. Visible light spans 430 to 690 nm (violet to red), so fiber optic system wavelengths use part of the visible spectrum as well as the longer-wavelength, invisible infrared spectrum. 4. What are the advantages of using fiber optics? a) modern fiber-optic cables have much lower signal loss than copper transmission lines, which means that a signal can be carried much farther on an optical cable before it needs amplification. b) because the frequency of a light wave is very high, much more bandwidth is available on a fiber-optic cable than with a copper line. This means that fiber optics can carry much more information than copper. c) Fiber-optic signals are very secure (it is hard to tamper with a fiber-optic line), and since the signals in the cable are light instead of electricity, they are not affected by external sources of noise. d)
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This note was uploaded on 11/14/2011 for the course ECT 350 taught by Professor Brom during the Summer '11 term at N.C. A&T.

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