Free Space Optics

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TABLE OF CONTENTS

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List of Figures ........................................................................................................................... III Table of Abbreviations ............................................................................................................. VI Abstract .................................................................................................................................. VII ‫ .................................................................................................................................. المستخلص‬VIII

Chapter 1 Introduction...............................................................................................................1 1.1 Free Space Optics To The Rescue ..............................................................................1 1.2 The Local Area Network Extension Problem .............................................................1 1.3 Project Description ....................................................................................................2 1.4 Project Block Diagram .............................................................................................3 1.5 Report Layout ............................................................................................................5 Chapter 2 FSO as A Digital Communication System .................................................................6 2.1 Modulation Scheme in FSO ..............................................................................6 2.1.1 Unipolar Bi-Phase Characteristics ..................................................................7 2.2 FSO Channel Modeling .............................................................................................9 2.2.1 Attenuation ....................................................................................................9 2.2.2 Frequency Response ..................................................................................... 15 2.2.3 Induced Noise .............................................................................................. 15 2.2.4 Link Budget Equation .................................................................................. 16 Chapter 3 The Optical Transmitter ............................................................................................ 18 3.1 Light Characteristics ................................................................................................ 18 3.2 Eye Safety ............................................................................................................... 19 3.3 Driving and Conditioning Circuit ............................................................................. 20 3.4 Light-Emitting-Diodes ............................................................................................. 20 3.4.1 LED Electrical Characteristics ...................................................................... 20 3.4.2 LED Optical Characteristics ......................................................................... 23 3.5 The Designed Transmitter ........................................................................................ 25 3.5.1 Transmitter operation and simulation ........................................................... 25 I

3.5.2 PCB manufacturing and implementation ...................................................... 26 3.5.3 Practical Results ........................................................................................... 28 Chapter 4 The Optical Receiver ................................................................................................. 30 4.1: Introduction ............................................................................................................ 30 4.2 Photodiodes ............................................................................................................. 30 4.2.1...
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