PhysLink.com Logo
Back to School Sale
Back to School Sale

Question

What is material dispersion? In which way it is helpful in optical communication?
Asked by: T.R.K.Pydiraju

Answer

Material dispersion is the phenomena whereby materials cause a "bundle" of light to spread out as it propagates. We know that a laser pulse, while almost monochromatic, actually contains a continuum of wavelengths in a small range. The index of refraction of a material is dependant on the wavelength, so each frequency component actually travels at a slightly different speed. As the distance increases, the pulse becomes broader as a result.

The phenomena is NOT helpful in optical communications. On the contrary, material dispersion limits how much data can be sent, as the pulses will overlap and information will be lost. Ongoing research is attempting to reduce the effects of material dispersion. Promising methods include graded-index fibers and optical temporal solitons.
Answered by: Gary Russell, M.S., Systems Engineer, Reston, VA



Science Quote

'Natural science does not simply describe and explain nature, it is part of the interplay between nature and ourselves.'

Werner Heisenberg
(1901-1976)


All rights reserved. © Copyright '1995-'2018 PhysLink.com