Speed of DWDM Colors
Speed of DWDM Colors
(OP)
I have a question on why that some wavelengths travel faster than other wavelengths when it is traveling down a fiber. I know when I turn up equipment for a fiber transmission system this comes into play that longer wavelengths are slower. I thought all light travels at around 3 E8 m/sec. So what am I forgeting about.
Just curious,
Just curious,





RE: Speed of DWDM Colors
THE LONGER A WAVELENGTH, THE MORE SPACING BETWEEN EACH TRANSMITTED BIT HENCE THE DELAY.
Gregory Jowi
ojgreg@sprint.ca
Humility is a virtue that is often mistaken for weakness.
It takes more strength of character to seek assistance than to bury one's head in the sand.
RE: Speed of DWDM Colors
For telecom fiber n is between 1.5 and 1.6. Hence in fiber light only travels at about 2/3 of 8 x 10^8 m/s.
The index of refraction in fiber is function of the wavelength and therefore each wavelength has a different speed. Look for chromatic dispersion to better understand this phenomena.