PhysLink.com Logo

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






Support US

Our server costs have gone up and our advertising revenue has gone down. You do the math! If you find our site useful, consider donating to keep us going. Thanks!


Science Quote

'Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.'

Albert Einstein
(1879-1955)





All rights reserved. © Copyright '1995-'2018 PhysLink.com   Privacy Statement | Cookie Policy