Enterprise Architecture A to Z

236 ◾ Enterprise Architecture A to Z

lower loss at 1550 nm, making these good-operating-wavelength regions. Close to 1300

nm, two signals 10 nm apart in wavelengths (a typical laser line width) will have little dif-

ference in velocity. In contrast, a laser pulse with a 1 nm spectral width centered at 1550

nm will be broadened by 16 ps after traveling 1 km. If spectral width is 10 nm and fiber

length is 10 km, the pulse will be broadened by 1600 ps (1.6 ns). Negative values of chro-

matic dispersion have the same effect as positive values (sign indicates if longer or shorter

wavelengths travel faster).

3. Utilize a certain amount of Dispersion Compensation Fiber (DCF) at the receiving end.

When utilizing WDMs, multiple wavelengths travel down ...