To send information over a fiber bits of information are successively encoded and represented digitally by
pulses of light. The more rapidly a laser pulses on and off the higher the bit rate and the closer encoded bits of
information are spaced temporally. As these pulses of light propagate through a fiber, figure 10, they tend to lose
their shape and spread out eventually over lapping each other causing inter-symbol interference. The higher the
data rate of the channel the more sensitive the overall system is to the effects of dispersion. Hence dispersion limits
the information carrying capacity of a fiber.