Ch4Sec1 - Joseph C. Palais 4.1 6 Integrated Optics...

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THE FIBER FORUM Fiber Optic Communications JOSEPH C. PALAIS PRESENTED BY
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Joseph C. Palais 4.1 2 Chapter 4 INTEGRATED OPTIC WAVEGUIDES
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Joseph C. Palais 4.1 3 Section 4.1 Dielectric Slab Waveguide n 3 n 2 n 1 d z x y Trapping of light ray in a waveguide n 2 < n 1 n 3 < n 1 θ
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Joseph C. Palais 4.1 4 Integrated Optics The wave is guided by total internal reflection. Why study this structure? 1. It is the basis of integrated optics. Various components can be constructed on a single substrate. 2. The waveguide shares many properties with the fiber waveguide. It is easier to analyze.
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Joseph C. Palais 4.1 5 Integrated Optics For complete guidance, we need θ > θ c , where 1 3 1 2 sin sin n n n n c c = = θ lower boundary upper boundary whichever yields the largest value of θ c is used. We also need smooth boundary surfaces.
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Unformatted text preview: Joseph C. Palais 4.1 6 Integrated Optics MATERIALS USED Lithium niobate (LiNbO 3 ) (1) strong electro-optic effect (2) loss 2245 1 dB/cm (3) used for modulator and switches Joseph C. Palais 4.1 7 INTEGRATED OPTICS Gallium Arsenide (GaAs) (1) semiconductor (2) light sources and photodetectors (3) loss 2245 2 dB/cm For integrated waveguides, the wave is mainly in the central thin film (n 1 ), but evanescent tails reach into the two substrate regions (n 2 and n 3 ). Joseph C. Palais 4.1 8 INTEGRATED OPTICS Unsymmetrical Waveguide n 3 = 1 (air) and n 2 not 1. Symmetrical Waveguide n 2 = n 3 The symmetrical waveguide is analogous to the fiber optic waveguide....
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This note was uploaded on 05/11/2010 for the course EEE EEE-448 taught by Professor Palais during the Fall '09 term at ASU.

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Ch4Sec1 - Joseph C. Palais 4.1 6 Integrated Optics...

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