ENGRI111_14_photonic - ENGRI 111 ENGRI 111 Optical Fibers Refraction Refraction n i/n r = sin r/sin i i r Total Internal Reflection Total Internal

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Unformatted text preview: ENGRI 111 ENGRI 111 Optical Fibers Refraction Refraction n i /n r = sin r /sin i i r 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 Single Mode Fiber Single Mode Fiber omlc.ogi.edu Optical Fiber Requirements Optical Fiber Requirements Contain light Total internal reflection No defects No loss of intensity Low attenuation (dB/km) 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 Absorption: Impurities Absorption: Impurities Ev Ec Ev Ec e hν e e Donor Level Similar with Acceptor Levels e hν hν Transitions in Vibrational States...
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This note was uploaded on 02/28/2008 for the course ENGRI 1110 taught by Professor Giannelis during the Fall '07 term at Cornell University (Engineering School).

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ENGRI111_14_photonic - ENGRI 111 ENGRI 111 Optical Fibers Refraction Refraction n i/n r = sin r/sin i i r Total Internal Reflection Total Internal

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