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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.
Security. Optical fiber offers increased security against unauthorized
tampering of information, since it is extremely difficult and expensive to tap
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.
- Spring '14