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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.

The turns ratio of a balanced-to-unbalanced ( balun ) or unbalanced-to-balanced ( unbal ) transformer might be 1:1, but it doesn t have to be. If the impedances of the

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Metal Oxides Certain metal oxides have properties that make them useful in the manufacture of semiconductor devices. When you hear about MOS (pronounced moss ) or CMOS (pronounced sea moss ) technology, you are hearing about metal-oxide semiconductor and complementary metal-oxide semiconductor devices, respectively. An advantage of MOS and CMOS devices is the fact that they need almost no power to function. They draw so little current that a battery in a MOS or CMOS device lasts just about as long as it would on the shelf. Another advantage is high speed. This allows operation at high frequencies in RF equipment, and makes it possible to perform many switching operations per second for use in computers. Certain types of transistors, and many kinds of ICs, make use of this technology. In integrated circuits, MOS and CMOS allow for a large number of discrete diodes and transistors on a single chip. Engineers would say that MOS/CMOS has high component density. The biggest problem with MOS and CMOS technology is the fact that the devices are easily damaged by static electricity. Care must be used when handling components of this type. Technicians working with MOS and CMOS components must literally ground themselves by wearing a metal wrist strap connected to a good earth ground. Otherwise, the electrostatic charges that normally build up on their bodies can destroy MOS and CMOS components when equipment is constructed or serviced.

338 Transformers and impedance matching balanced and unbalanced parts of the systems are the same, then a 1:1 turns ratio is ideal. But if the impedances differ, the turns ratio should be such that the impedances are matched. This is discussed in the section on impedance transfer ratio that follows.

Scattering occurs because of impurities or irregularities in the physical makeup of the fiber itself. The best known form of scattering is called

The joule, while standard among scientists, is not the only energy unit in existence! Another unit is the erg, equivalent to one ten-millionth (0.0000001) of a joule. The erg is used in lab experiments involving small amounts of expended energy.

Transformers are sometimes used between amplifier stages in electronic equipment where a large amplification factor is needed. There are other methods of coupling from one amplifier stage to another, but transformers offer some advantages, especially in radio-frequency receivers and transmitters. Part of the problem in getting a radio to work is that the amplifiers must operate in a stable manner. If there is too much feedback, a series of amplifiers will oscillate, and this will severely degrade the performance of the radio. Transformers that minimize the capacitance between the amplifier stages, while still transferring the desired signals, can help to prevent this oscillation.

Table 2-3.

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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