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

Search

Loading



Sponsors

USC University of Southern California Dornsife College Physics and Astronomy Department McMaster University Physics and Astronomy Department

Science Quote

'The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in athematics as surely as in poetry.'

Bertrand Russell
(1872-1970)

Deal of the Day

Image of Hover Craft Kit. Click on this image for more info. Hover Craft Kit
Regular Price: $29.99
Today's Price: $12.00
Learn the science behind hover craft technology with this cool kit! Buy it now! Deal ends at midnight!

Top Selling

Here are our physics & astronomy bestsellers:
Mini Plasma Ball
Slide Making Kit
Top Secret - Spinning Top
Wood Grain Newtons Cradle
Deluxe 3D Mirascope
Solar Radiometer
Periscope
Solar Science 4M Kit
Ultimate Chemistry Set CHEM C3000
3D Magnetic Field Tube