Page 28 - Flipped book_fiber optics

COMPARISON BETWEEN INTERMODAL DISPERSION &

INTRAMODAL DISPERSION :

INTERMODAL DISPERSION :

Used in Multimode Fiber.

Also known as "Modal Dispersion"

In Intermodal dispersion more pulse broadning.

INTRAMODAL DISPERSION :

Used in Single Mode Fiber.

Also known as "Material Dispersion"

In Intramodal dispersion less pulse broadning.

iii. Polarization Mode Dispersion

With different polarization light travel at different speeds, if the fiber

is not perfectly symmetric at the atomic level.

This could come from imperfect circular geometry or stress on the

cable, and there is no easy way to correct it.

It can affect both single mode and multimode fiber.

although the single-mode fiber can sustain only one transverse

mode, it can carry this mode with two different polarizations, and

slight imperfections or distortions in a fiber can alter the propagation
velocities for the two polarizations.