Ch4Sec4 - THE FIBER FORUM Fiber Optic Communications...

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THE FIBER FORUM Fiber Optic Communications JOSEPH C. PALAIS PRESENTED BY
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Joseph C. Palais 4.4 2 Section 4.4 Coupling To The Waveguide n 2 n 2 n 1 d Light source 4.4.1 Edge Coupling Problems 1.) Source must be smaller than the film (d 2245 1 μ m). 2.) The emitted rays must match mode angles. 3.) Light emitted beyond the critical angle will not propagate.
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Joseph C. Palais 4.4 3 Edge Coupling n 2 n 2 n 1 Edge Coupling θ α 1 α 0 Find the relationship between α 0 and θ .
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Joseph C. Palais 4.4 4 Edge Coupling Snell's Law 1 2 2 2 1 c cos n n n - = θ n 1 n 2 2 2 2 1 n n - θ c 1 2 c sin n n = At the critical angle α cos sin 1 0 0 n n = - = = π 2 sin sin sin 1 1 1 0 0 n n n c 0 Eventually decreases. increase As = Then
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Joseph C. Palais 4.4 5 Edge Coupling - = = 1 2 2 2 1 1 1 0 0 cos sin n n n n n n c θ α The incident ray angle that results in an internal ray at the critical angle is thus found from: 2 2 2 1 0 0 sin n n n - = where α o is now the maximum acceptance angle.
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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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Ch4Sec4 - THE FIBER FORUM Fiber Optic Communications...

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