|
Speed of DWDM Colors
|
|
Source：Internet Author：Unknow Pubdate：2008-04-14
|
|
wpayton (Electrical)
5 Oct 00 1:49
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,
GregoryJ (Computer)
8 Oct 00 19:45
REFRCTIVE INDEX AND WAVELENGTH COME INTO PLAY.
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.
BelAnt (Electrical)
7 Dec 00 10:15
字串6
The speed of light is a constant in vacuum. In materials the speed is a function of index of refraction. v (actual velocity) = c (speed of light in vacuum) / n (index of refraction).
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.
（Click：）
|
| Previous：basics of hardware architecture Next：RS-485 |
|
[ Add TO Favorites]
[TOP] [PRINT]
[CLOCE WINDOWS] |
|
|
|
