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To make fiber from a preform, the preform is mounted in a furnace 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
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Figure 6-17 Preforms, ready to be drawn.
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the furnace, the fiber solidifies. Needless to say, the process is carefully managed to ensure that the thickness of the fiber is precise; microscopes are used to verify the geometry of the fiber. Other stages in the manufacturing process include monitoring processes 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.
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Optical Transmission
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Dozens of different types of fiber exist. 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. Generally speaking, two major types of fiber exist: multimode, which is the earliest form of optical fiber and is characterized by a large diameter central core, short distance capabilities, and low bandwidth; and single mode, which has a narrow core and is capable of greater distances and higher bandwidth. Varieties of each 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, the inevitable weakening of the transmitted signal over distance that has a direct analog in the copper world. Attenuation is typically the result of two subproperties, scattering and absorption, both of which have cumulative effects. The second is dispersion, which is the spreading of the transmitted signal and is analogous to noise.
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Scattering
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Scattering occurs because of impurities or irregularities in the physical makeup of the fiber itself. The best known form of scattering is called
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Rayleigh scattering. It is caused by metal ions in the silica matrix and results in light rays being scattered in various directions. Rayleigh scattering occurs most commonly around wavelengths of 1000 nm and is responsible for as much as 90 percent of the total attenuation that occurs in modern optical systems. It occurs when the wavelengths of the light being transmitted are roughly the same size as the physical molecular structures within the silica matrix. Thus, short wavelengths are affected by Rayleigh scattering effects far more than long wavelengths. In fact, it is because of Rayleigh scattering that the sky appears to be blue. The shorter (blue) wavelengths of light are scattered more than the longer wavelengths of light.
Absorption
Absorption results from three factors: hydroxyl (OH ; water) ions in the silica, impurities in the silica, and incompletely diminished residue from the manufacturing process. These impurities tend to absorb the energy of the transmitted signal and convert it to heat, resulting in an overall weakening of the optical signal. Hydroxyl absorption occurs at 1.25 and 1.39 m. At 1.7 m, the silica itself starts to absorb energy because of the natural resonance of silicon dioxide.
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