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Transcript
OPTICAL FIBER
WAVEGUIDE
Optical Fiber Waveguides
• An Optical Fiber is a dielectric waveguide
that operates at optical frequencies
• Normally cylindrical form
• It confines electromagnetic energy in the
form of light to within in its surfaces and
guides the light in direction parallel to its
axis
Optical Fiber Waveguides
core
Cladding
Buffer coatting
Optical Fiber Waveguides
• Refraction
Exit ray
Low index
High index
Partial internal
reflection
Incident ray
Optical Fiber Waveguides
• Critical angel

Critical angel :
Sin  = n2/n1
Optical Fiber Waveguides
• Total Internal Reflection

Total internal
reflection
Optical Fiber Waveguides
• Acceptance Angle