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ENGRI_111_14_photonics5

ENGRI_111_14_photonics5 - ENGRI 111 Optical Fibers...

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ENGRI 111 ENGRI 111 Optical Fibers
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Refraction Refraction n i /n r = sin r /sin i i r
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Total Internal Reflection Total Internal Reflection i 1 r 1 i 2 i 3 r 2 r 3 n 1 n 2 n 1 > n 2 Light moves faster Refracted angle larger Critical incident angle above which light does not escape
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Single Mode Fiber Single Mode Fiber omlc.ogi.edu
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Optical Fiber Requirements Optical Fiber Requirements Contain light Total internal reflection No defects No loss of intensity Low attenuation (dB/ km)
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Causes of Attenuation Causes of Attenuation Absorption Atomic impurities (look into the edge of window glass) OH groups absorb IR – excitations to higher vibrational state Scattering by flaws and impurities Depends on relative size of particles and wavelength of light Reflection by connectors
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Absorption: Impurities Absorption: Impurities Ev Ec Ev Ec e h ν e e Donor Level Similar with Acceptor Levels e h ν h ν
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Transitions in Vibrational States Transitions in Vibrational States h ν Ground State
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