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Chapter 4: Optical Fibres (Basic (Working principle (Acceptance angle…
Chapter 4: Optical Fibres
Basic
Basic structure
Working principle
Acceptance angle
Geometrical Properties
Classification of Fibres
Fibre materials
Refractive Index Profile
Step -Index
Graded-Index
Special-Index
Core Cladding Size
Light Propagation
V-parameters
Total no. of modes
Transmission Properties
Attenuation
Attenuation coefficient
Loss Mechanism
UV absorbtion
Infrared absorption
Rayleigh scattering
External Factors
Impurities
Imperfections
Total Loss
Other losses
Connectors
Splices
Terminations
Non-linear scattering level
Above threshold power level
Stimulated Brillouin scattering
Stimulated Raman Scattering
Dispersion
Pulse Spreading
Effect
Information error
Dispersion sets a limit to the maximum link length possible for certain bit rate
Effect of dispersion on different fibres
MMSI
Very large pulse broadening
MMGI
Large pulse broadening
SMSI
Small pulse broadening
Types of Dispersion
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