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Dispersion in an optical fibre used in a communication link is of which type:

Dispersion in an optical fibre used in a communication link is of which type: Correct Answer Modal dispersion

Concept of Model Dispersion: 
  • Modal dispersion is a distortion mechanism occurring in multimode fibers and other waveguides, in which the signal is spread in time because of different propagation velocities for all modes. As we know, light rays entering the fiber at different angles of incidence will go through different paths/modes.
  • Some of these light rays will travel straight through the center of the fiber (axial mode) while others will repeatedly bounce off the cladding/core boundary to zigzag their way along the waveguide, as illustrated below with a step-index multimode fiber. Whenever there is a bounce-off, modal dispersion (or intermodal dispersion) happens.
  • The longer the path is, the higher the model dispersion will be. For example, the high-order modes (light entering at sharp angles) have more model dispersion than low-order modes (light entering at smaller angles).

 

 

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