ENGRI111_014_photonics5 - Excited States Vibrational states...

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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 e e Donor Level Similar with Acceptor Levels e
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Transitions in Vibrational States Transitions in Vibrational States Ground State
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Unformatted text preview: Excited States Vibrational states are accessible with IR radiation, 10-2 eV Scattering Scattering www.physics.csbsju.edu Cladding and Multiplexing Cladding and Multiplexing www.its.bldrdoc.gov www.indiamart.com Role of Cladding Role of Cladding Defects on fiber surface can also cause loss Light lost here The Discovery The Discovery Donald Keck Robert Maurer Peter Schultz Corning Corning 1970 The Discovery The Discovery Only 1 % of light was transmitted at the end of 1 km fiber Attenuation of optical fibers < 1 dB/km Core and Cladding: Core and Cladding: SiO SiO 2 Purification Purification SiO 2 + C Si + CO 2 Si + HCl SiCl 4 + H 2 SiCl 4 + O 2 SiO 2 + Cl 2 How to make the core and cladding layers? Manufacturing Manufacturing O 2 + SiCl 4 + GeCl 4 Why is Ge included in the core? Manufacturing Manufacturing O 2 + SiCl 4 + GeCl 4...
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This note was uploaded on 10/24/2008 for the course ENGRI 1110 taught by Professor Giannelis during the Fall '07 term at Cornell University (Engineering School).

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ENGRI111_014_photonics5 - Excited States Vibrational states...

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