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An LED or IRED and a photodiode can be combined in a single package to get a component called an optoisolator. This device (Fig. 20-10) actually creates a modulated light signal and sends it over a small, clear gap to a receptor. The LED or IRED converts an electrical signal to visible light or infrared; the photodiode changes the visible light or infrared back into an electrical signal.

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.

20-10 An optoisolator uses an LED or IRED (input) and a photodiode (output).

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A simplified drawing of an NPN bipolar transistor is shown in Fig. 22-1A, and the schematic symbol is shown in Fig. 22-1B. The P-type, or center, layer is called the base. One of the N-type semiconductor layers is the emitter, and the other is the collector. Sometimes these are labeled B, E, and C in schematic diagrams. A PNP bipolar transistor has two P-type layers, one on either side of a thin N-type layer (Fig. 22-2A). The schematic symbol is shown in Fig. 2-22B. It s easy to tell whether a bipolar transistor in a diagram is NPN or PNP. If the device is NPN, the arrow at the emitter points outward. If the device is PNP, the arrow at the emitter points inward. Generally, PNP and NPN transistors can perform the same functions. The differences are the polarities of the voltages and the directions of the resulting currents. In most applications, an NPN device can be replaced with a PNP device or vice versa, the power-supply polarity can be reversed, and the circuit will work in the same way as long as the new device has the appropriate specifications.

6

A major source of headache for engineers has always been the fact that, when a signal is electrically coupled from one circuit to another, the impedances of the two stages interact. This can lead to nonlinearity, unwanted oscillation, loss of efficiency, or other problems. Optoisolators overcome this effect, because the coupling is not done electrically. If the input impedance of the second circuit changes, the impedance that the first circuit sees will remain unaffected, being simply the impedance of the LED or IRED.

of an NPN transistor. At B, the schematic symbol. Electrodes are E = emitter, B = base, and C = collector.

A silicon diode, with no bias voltage applied, will generate dc all by itself if enough electromagnetic radiation hits its P-N junction. This is known as the photovoltaic effect. It is the principle by which solar cells work. Photovoltaic cells are made to have the greatest possible P-N junction surface area. This maximizes the amount of light that falls on the junction. A single silicon photovoltaic cell can produce about 0.6 V of dc electricity. The amount of current that it can deliver depends on the surface area of the junction. For every square inch of P-N surface area, a silicon photovoltaic cell can produce about 160 mA in direct sunlight. Photovoltaic cells are often connected in series-parallel combinations to provide power for solid-state electronic devices like portable radios. A large assembly of solar cells is called a solar panel. Solar-cell technology has advanced rapidly in the last several years. Solar power is expensive to produce, but the cost is going down and solar cells do not pollute.

without cost. Multiwavelength systems will not operate effectively over DSF because of dramatic nonlinearities, so if DWDM is to be used, NZDSF must be deployed.

of a PNP transistor. At B, the schematic symbol. Electrodes are E = emitter, B = base, and C = collector.

Refer to the text in this chapter if necessary. A good score is at least 18 correct. Answers are in the back of the book. 1. When a diode is forward-biased, the anode: A. Is negative relative to the cathode. B. Is positive relative to the cathode. C. Is at the same voltage as the cathode. D. Alternates between positive and negative relative to the cathode. 2. If ac is applied to a diode, and the peak ac voltage never exceeds the avalanche voltage, then the output is: A. B. C. D. Ac with half the frequency of the input. Ac with the same frequency as the input. Ac with twice the frequency of the input. None of the above.

Dense Wavelength Division Multiplexing (DWDM)

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