Question

What are the different factors responsible for the attenuation in optical fibers? What is intermodal and intramodal pulse dispersion?​

Answer 1

Answer:

The attenuation of the optical fiber is a result of two factors, absorption and scattering. The absorption is caused by the absorption of the light and conversion to heat by molecules in the glass. Primary absorbers are residual OH+ and dopants used to modify the refractive index of the glass.

Intermodal dispersion (also called modal dispersion) is the phenomenon that the group velocity of light propagating in a multimode fiber (or other waveguide) depends not only on the optical frequency (→ chromatic dispersion) but also on the propagation mode involved.

Answer 2

QUESTION:-

What are the different factors responsible for the attenuation in optical fibres? What is intermodal and intramodal pulse dispersion?

ANSWER:-

The different factors responsible for the attenuation in optical fibres are Absorption and Scattering.

• Absorption results from the absorption of light and conversion to heat by the molecules present in the glass.

• Scattering results from the colliding of light with individual atoms in the glass which is anisotrophic. Lights that get scattered at an angle outside the fibre's numerical aperture are absorbed into the cladding or transmitted back to the source.

Intramodel Pulse Dispersion:- Pulse expanding within a solitary mode is known as intramodal dispersion. As this phenomenon is dependent on wavelength and grouping velocity is a function of wavelength, it is also known as group velocity dispersion (GVD)

Intermodal Pulse Dispersion:- Dispersion which is caused by the propagation of multipath of light energy is pertained to as intermodal dispersion. Signal degradation arises due to various values of group uncertainty for each particular mode at an available frequency.

#SPJ2