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Overview of Optical Technology
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Overview of Optical Technology
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Figure 4-14 Manufacturing fiber using internal vapor deposition (IVD) process.
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the sooty deposit to collect on the inside surface of the tube (Figure 4-14). The continued heating of the tube causes the soot to fuse into a glass-like substance. This process can be repeated as many times as required to create a graded refractive index. Ultimately, once the deposits are complete, the entire assembly is heated fiercely, which causes the tube to collapse, creating what is known in the optical fiber industry as a preform. Figure 4-15 shows an example of a preform. An alternative manufacturing process is called outside vapor deposition (OVD). In the OVD process, the soot is deposited on the surface of a rotating ceramic cylinder in two layers (Figure 4-16). The first layer is the soot that will become the core; the second layer becomes the cladding. Ultimately, the rod and soot are sintered to create a preform. The ceramic is then removed, leaving behind the fused silica that will become the fiber. A number of other techniques are available for creating the preforms that are used to create fiber, but these are the principal techniques in use today. The next step is to convert the preform into optical fiber.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Figure 4-15 Fiber preforms.
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4
First glass layer
Figure 4-16 Manufacturing fiber using outside vapor deposition (OVD) process.
Ceramic rod Second glass layer
Drawing the Fiber
To make fiber from a preform, the preform is mounted in a furnace, shown in Figure 4-17, at the top of a tall building called a drawing tower. The bottom of the preform is heated until it has the consistency of taffy, at which time the soft glass is drawn down to form a thin fiber. When it strikes the cooler air outside the furnace, the fiber solidifies. Needless to say, the
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Overview of Optical Technology
Overview of Optical Technology
process is carefully managed to ensure that the thickness of the fiber is precise; microscopes such as the one in Figure 4-18 are used to verify the geometry of the fiber. Other stages in the manufacturing process include a monitoring process to check the integrity of the product, a coating process that applies a protective layer, and a take-up stage where the fiber is wound onto reels for later assembly into cables of various types.
Optical Fiber
Dozens of different types of fiber are available. Some of them are holdovers from previous generations of optical technology that are still in use and represented the best efforts of technology available at the time; others represent improvements on the general theme or specialized solutions to specific optical transmission challenges.
Figure 4-17 Drawing furnaces.
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Overview of Optical Technology
Figure 4-18 Fiber manufacturing quality control process.
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Generally speaking, two major types of fiber are used: multimode, which is the earliest form of optical fiber and is characterized by a large diameter central core, short-distance capability, and low bandwidth; and single mode, which has a narrow core and is capable of greater distance and higher bandwidth. Varieties of each of these will be discussed in detail later in the book. To understand the reason for and philosophy behind the various forms of fiber, it is first necessary to understand the issues that confront transmission engineers who design optical networks. Optical fiber has a number of advantages over copper: it is lightweight, has enormous bandwidth potential, has significantly higher tensile strength, can support many simultaneous channels, and is immune to electromagnetic interference. It does, however, suffer from several disruptive problems that cannot be discounted. The first of these is loss or attenuation,
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