Dispersion
2023-11-23
Definition:
The effect of light frequency or propagation mode on phase velocity in a medium.
There are many types of dispersion, which all involve the phase velocity or phase delay of light in a medium or device and are related to certain parameters:
Chromatic-dispersion, phase velocity is related to light frequency or wavelength. Possibly from frequency dependence of refractive index, or waveguide dispersion.
Intermodal dispersion comes from the difference in propagation constants of higher-order transverse modes in waveguides (multimode fibers). This will greatly limit the data rate in fiber optic communication systems using multimode fiber.
Polarization mode dispersion comes from the propagation characteristics related to the polarization state. In fiber-optic links using single-mode fiber, this effect is more obvious when the data transmission rate is very high.
Due to the existence of chromatic dispersion, the refraction angle of the light surface is also related to the frequency, resulting in angular dispersion. This effect causes the optical path to be frequency-dependent and also brings about dispersion. A prism pair or a diffraction grating pair can be used for dispersion compensation. Angular dispersion is related to pulse front tilt.
The effect of light frequency or propagation mode on phase velocity in a medium.
There are many types of dispersion, which all involve the phase velocity or phase delay of light in a medium or device and are related to certain parameters:
Chromatic-dispersion, phase velocity is related to light frequency or wavelength. Possibly from frequency dependence of refractive index, or waveguide dispersion.
Intermodal dispersion comes from the difference in propagation constants of higher-order transverse modes in waveguides (multimode fibers). This will greatly limit the data rate in fiber optic communication systems using multimode fiber.
Polarization mode dispersion comes from the propagation characteristics related to the polarization state. In fiber-optic links using single-mode fiber, this effect is more obvious when the data transmission rate is very high.
Due to the existence of chromatic dispersion, the refraction angle of the light surface is also related to the frequency, resulting in angular dispersion. This effect causes the optical path to be frequency-dependent and also brings about dispersion. A prism pair or a diffraction grating pair can be used for dispersion compensation. Angular dispersion is related to pulse front tilt.
