lect26 - WAVEGUIDES How to guide light Guiding by...

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How to guide light? Guiding by dielectric boundaries Integrated optics and fiber optics Modes guided by metallic waveguides - Phase and group velocities - Dispersion relation of TE and TM modes Modes guided by dielectric waveguides - Reflection by planar dielectric boundary - Dispersion relation of TE and TM modes - Phase and group velocities - Step index and graded index waveguides Generalized parameters Guided modes WAVEGUIDES
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OPTICAL COMMUNICATION Selenium cells photoconductor: Resistance ~ 1/ Illumination Wikipedia Vibrating mirror: Concave – focus Convex - disperse Sun light Bells Photophone 213 m
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OPTICAL COMMUNICATION Shortcoming of free space communication Beam divergence Air turbulence Atmospheric attenuation and weather conditions 0.01 dB/km to 300 dB/km Privacy and security issues
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ATTENUATION OF EM WAVES
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OPTICAL COMMUNICATION Shortcoming of free space communication Beam divergence Air turbulence Atmospheric attenuation and weather conditions 0.01 dB/km to 300 dB/km Privacy and security issues Guided wave communications
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Metallic reflectors and dielectric reflectors Loss per reflection All metals are lossy at optical wavelengths Dielectric reflectors and available dielectric materials Total internal reflection Silver f=10 GHz, =3 cm 0.03% per reflection f=474 THz, =633 nm 5.2% per reflection REFLECTORS
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LOW-LOSS DIELECTRICS
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Fiber optics, integrated optics and guided wave optics Guiding by total internal reflection at dielectric boundaries AT OPTICAL WAVELENGTH RANGE
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Integrated optics AT OPTICAL WAVELENGTH RANGE
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Fiber optics, integrated optics and guided wave optics AT OPTICAL WAVELENGTH RANGE Book: 8.1-3
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Step index waveguides Graded index waveguides INTEGRATED OPTICS Thin-film waveguides
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Modes TEM mode in free space TE, TM and TEM modes in metallic WG’s TE and TM modes in two-dimensional metallic and dielectric waveguides Dispersion relation The propagation constant depends on , , and waveguide geometry Phase and group velocities d d v , v gr ph WAVE PROPAGATION CHARACTERISTICS
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Superposition of two cosine waves of equal amplitudes and slightly different frequencies WAVE SUPERPOSITION 0 0.5 1 1.5 2 2.5 3 3.5 4 -1 0
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This note was uploaded on 02/12/2012 for the course ECE 414 taught by Professor Alenxendra during the Spring '11 term at Purdue.

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lect26 - WAVEGUIDES How to guide light Guiding by...

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