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1. Optical
Fiber

2. Optical
Fiber

3. Optical Fiber

4. Optical Cables

5. Structure of an Optical Fiber

6. Jacket
Optical Cable
Structure of an Optical Fiber

7. How Does an Optical Fiber Transmit Light?

8. How Does an Optical Fiber Transmit Light?

9. How Does an Optical Fiber Transmit Light?
Incident
Light Ray
Emarging
Light Ray
Glass Cladding
(Low Density)
Glass Core
(High Desity)
Total Internal reflection is the reflection of light that occurs when it strikes an
interface at an angle of incidence greater than the critical angle for the pair of
media.
Critical angle is that angle of incidence for which a ray of light while moving from a
denser to a rarer medium just grazes over the surface of separation of the two
media. That is, the angle of refraction is equal to 90°.

10. Propagation of Light in an Optical Fiber

11. Propagation of Light in an Optical Fiber
Light signals degrade due to the presence of impurities in the glass.

12. Terminology Used in Fiber Optics
The maximum angle of Incidence in air, for which all the incident light is totally reflected at
the interface of a pair of media having refractive Indices and p Is called the angle of
acceptance.
Fiber attenuation: It is defined as the loss of light energy during its transmission through
an optical fiber due to absorption by the impurities in the glass fiber.