Page 25 - Flipped book_fiber optics

Dispersion

 Dispersion – Spreading of the optical pulse as it travels along

the fiber
 Limits how fast information is transferred.

 If the signal pulse rate is too fast, dispersion will cause the
pulses to overlap giving rise to distortion.

 Two main factors which causes dispersion is, different source

wavelengths and modes
 To reduce dispersion distortion, the number of modes the fibre

supports must be reduced. This is achieved by reducing the
diameter of the core.

There are 3 type of dispersion.
i. Modal Dispersion / Intermodal Dispersion

ii. Chromatic Dispersion / Intramodal Dispersion
iii. Polarization Mode Dispersion