Q. What is the advantage of fiber optics in communications?
A. Conventional wire lines are limited to a certain bandwidth by their inductance and capacitance. This limits the number of signals they can carry. They are also prone to interference from electromagnetic waves (radio waves, for example).
Optical fibers use light instead of electricity to carry signals. The light is turned on and off in pulses to carry digital signals. Theoretically, tremendous bandwidth is possible, but this is mainly limited by the technology used to make the light sources and receivers.
Even so, present devices are capable of greater bandwidth than is possible with wire lines. Fiber optic cables are also immune to electromagnetic interference. They are lighter and less expensive than Wire lines, as well.