Chapter 9 - Information Technology in Theory By Pelin Aksoy...

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Information Technology in Theory Chapter 9 Introduction to Fiber Optics Information Technology in Theory By Pelin Aksoy and Laura DeNardis
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Information Technology in Theory 2 Objectives Understand the importance of fiber-optic technologies in the information society Identify the fundamental components of a fiber-optic cable Understand the principles by which light travels within a fiber-optic cable, including refraction and total internal reflection
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Information Technology in Theory 3 Objectives (Continued) Understand how a single fiber can carry multiple signals through wavelength division multiplexing Learn about the advantages and disadvantages of fiber optics as a transmission medium for various applications Gain exposure to cutting-edge fiber-optic approaches
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Information Technology in Theory 4 Background on Optical Communications Fiber-optic communication Trapping light inside an optical fiber Can carry any form of information Fiber is an optical medium, which means it is capable of transmitting light. Based on total internal reflection (TIR)
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Information Technology in Theory 5 Tyndall’s Experiment
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Information Technology in Theory 6 Structure of Fiber Optic Cables Core Cladding Coating
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Information Technology in Theory 7 General Structure of Fiber Optic Cables
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Information Technology in Theory 8 General Structure of Fiber Optic Cables
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Information Technology in Theory 9 Structure of Fiber Optic Cables – Cladding Cylindrical material made of glass or specialized plastic Central portion of the fiber Light signal carrying the information travels through the core. The diameter of the core can range from a couple of micrometers ( µm -one millionth of a meter) to a couple of millimeters ( mm -one thousandth of a meter)
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Information Technology in Theory 10 Structure of Fiber Optic Cables – Jacket Surrounds the cladding Insulates and protects the fiber from physical damage and environmental effects, such as moisture that might interfere with the inner workings of the cable Usually made of opaque plastic or another type of material
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Information Technology in Theory 11 How Light Travels Through Fiber TIR is the basis of fiber-optic communication TIR may be considered to be an extreme case of refraction. When a light ray strikes a boundary of two materials with different RIs, it bends, or in other terms, refracts to an extent that depends on the ratio of the RIs of the two materials.
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12 Refraction The phenomenon that causes a spoon inside a clear glass of water to appear shorter and bent to an observer looking from the outside. Light rays that strike the water/air boundary bend to create an image that is shorter than the actual height of the spoon in the water, because water has a higher RI than air. TIR is the phenomenon that makes the side of an
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Chapter 9 - Information Technology in Theory By Pelin Aksoy...

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