M171L_1_6b_OE_F_10 (1)

M171L_1_6b_OE_F_10 (1) - 1. Introduction 1. Geometric...

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1 LAB 6b (11/04) Fiber-Optics in Digital Communication Systems 1. Introduction 1. Geometric Optics 2. Classification of Optical Fibers and Their Characteristics 3. Multimode Graded Index Fiber 4. Single Mode Step Index Fiber 5. Dispersion 6. Bandwidth of a Single Mode Optical Fiber 7. Fiber Optic in Point-to-Point Communication Link 8. Lasers 9. Distributed Feedback Laser Diode 10. Avalanche Photodiode 11. Appendix
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2 Frequency Wavelength 659 THz Violet 455 nm 612 THz Blue 490 nm 545 THz Green 550 nm 517 THz Yellow 580 nm 484 THz Orange 620 nm 375 THz Red 750 nm 216 THz IR 1300 nm 181 THz IR 1500 nm 10 22 10 21 10 20 10 19 10 18 10 17 10 16 10 15 10 14 10 13 10 12 10 11 10 10 10 9 10 8 10 7 10 6 10 5 10 4 10 3 10 2 10 1 Visible Light Cosmic Rays Gamma Rays X-Rays Ultraviolet Light Infrared Light Microwave, Radar, UHF, Cellular, PCS VHF Television, FM Short wave Radio AM Radio Sound Subsonic Wavelength = c Frequency
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3 (a) Straight line propagation in a wide aperture, d >> λ d (b) Some diffraction at edges when d = d (c) Full diffraction when d <<
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4 C. Reflection When light encounters a surface, some light will be absorbed by the surface, some light will be transmitted through the surface, and some light will be reflected by the surface. (a) Specular reflection (b) Diffuse reflection θ 1 θ 1 ΄ θ 1 = θ 1 ΄
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5 Light source n 1 Slower transmission Faster transmission n 2 < n 1 a L 1 L 2 L 1 ´ L 2 ´ Light destination D. Format’s Principle Format’s principle states that when a light ray travels between two
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M171L_1_6b_OE_F_10 (1) - 1. Introduction 1. Geometric...

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