✔what is dispersion ? what are the different types of dispersion? Explain .!
Answers
Explanation:
In an optical medium, such as fiber, there are three types of dispersion, chromatic, modal, and material. Chromatic Dispersion. Chromatic dispersion results from the spectral width of the emitter. The spectral width determines the number of different wavelengths that are emitted from the LED or las
Dispersion occurs when a pulse of light is spread out during transmission on the fiber.
In data transmission systems, five types of dispersion can occur:
- Modal dispersion.
Modal dispersion occurs when the rays travel along multiple paths and have multiple path lengths. Since the rays do not travel the same distance, different rays will arrive at the end of the fiber at different times. Modal dispersion can therefore be described as path length dispersion.
- Chromatic dispersion.
Chromatic dispersion is the second biggest cause of dispersion. Chromatic dispersion occurs because all commercial fiber optic light sources emit a range of wavelengths, known as the spectral width
- Material dispersion.
Both lasers and LEDs produce a range of optical wavelengths (a band Of light) rather than a single narrow wavelength
- Waveguide dispersion.
Waveguide dispersion is a very complex effect and is caused by the shape and index profile of the fiber core.
- Polarization Mode Dispersion.
When using multimode fiber, the light is able to take many different paths or “modes” as it travels within the fiber. The distance traveled by light in each mode is different from the distance travelled in other modes
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