Dispersion losses occur
in optic fibers are of two types- intermodal dispersion and intramodal
dispersion. Material dispersion and waveguide dispersion belongs to the
category of intramodal dispersion. Intramodal dispersion occurs when different
colours of light travel through different materials and different waveguide
structures of different speeds. In multimode fibers, material dispersion is
significant while waveguide dispersion is negligible. Appreciable amount of
material dispersion and waveguide dispersion occurs in single mode fibers.
Material dispersion is a function of the source spectral width and is very less
at longer wavelengths. Waveguide dispersion depends on fiber optic core
diameter and operating light wavelength.
No comments:
Post a Comment