The technique by which a digital signal is converted

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Unformatted text preview: nterference that can cause errors in other media, especially in twisted-pair wire. Consequently, optical fiber communication systems have the potential for reducing costs associated with complex error checking and correction mechanisms that must be used with media that are affected by electromagnetic interference. 4. Small size and light weight. Fiber optic cables are much smaller in size and lighter in weight than copper wires or coaxial cables. For example, a fiber optic cable with a core and cladding of 0.125 mm diameter and 3.5 mm outer protective coating has the same information carrying capacity as 900 twisted copper wire pairs with an 8 cm outer diameter and weighing 100 times as much. Size and weight are important factors when considering conduits running under overcrowded city streets. In some large cities there simply is no room for additional bulky copper wires. In this case, the use of smaller and lighter fiber optic cables is very effective. 5. Security. Optical fiber offers increased security against unauthorized tampering of information, since it is extremely difficult and expensive to tap optical signals. 6. Safety and electrical insulation. Optical fibers being insulators provide electrical isolation between the source and the destination. Hence they present no electrical spark hazards and can be safely used in those places where it is unsafe to use electrical conductors. 7. Analog and digital signals transmission. Both analog and digital signals can be transmitted by the use of optical fibers. In analog transmission, the light intensity is varied continuously. On the other hand, in digital transmission the light source is turned on or off. Optical fibers, however, suffer from the following disadvantages: 1. Optical fibers being fragile cannot be easily turned at sharp corners. They can turn only those corners that have radius of at least a few inches. This creates problem in the physical laying of the fiber optic cable. 2. Aligning and joining two fi...
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This document was uploaded on 04/07/2014.

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