The spreading of digital pulses as the light travels down the fiber is known as "chromatic dispersion". This phenomenon degrades the signal more and more as the signal travels further and further down the fiber. Consequently, dispersion only affects the link length, not the bandwidth. More bandwidth is realized by using different light sources of different "colors" in a wavelength division multiplexing (WDM) scheme.
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The spreading of digital pulses as the light travels down the fiber is known as "chromatic dispersion". This phenomenon degrades the signal more and more as the signal travels further and further down the fiber. Consequently, dispersion only affects the link length, not the bandwidth. More bandwidth is realized by using different light sources of different "colors" in a wavelength division multiplexing (WDM) scheme.