Total internal reflection occurs at the core-cladding boundary. The cladding makes sure that light does not cross from one fibre to another and the light signal is secure within each fibre.If the core is too wide then light travelling along the axis (middle) of the core travels in a straight line and travels a shorter distance than the totally internally reflected light.This causes pulse dispersion(a wider pulse).
Modal (Multipath) Dispersion
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Specification: AQA Physics (7407), AS-level, 3.3.2.3 Refraction at a plane surface. Topic: Optics.
Key terms in this lesson
- Equilibrium
- An object is in equilibrium when the resultant force and the resultant moment acting on it are both zero.
- Centre of mass
- The single point at which the entire weight of an object may be considered to act.